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    • 专利摘要:
    The invention relates to a control system for a laser coaxiality measuring device and a corresponding control method. In the control system, a semiconductor laser is connected to a PSD sensor, the output of which is connected to an input of a measurement amplification circuit, an output of the measurement amplification circuit being connected to an A / D conversion port of a one-chip computer module, a P1 The output of the one-chip computer module is connected to an input of an LED display module and a P2 input of the one-chip computer module is connected to an output of a key module, the one-chip computer module in bidirectional connection with a PC via a communication interface module stands. A “Display error” button, a “Start measurement” button, a “End measurement” button, a “Settings” button and a “Reset” button are provided on the button module. The device realizes a control system of a laser coaxiality measuring device. The method realizes a control method of a laser coaxiality measuring device.
    公开号:CH716534A2
    申请号:CH00973/20
    申请日:2020-08-05
    公开日:2021-02-26
    发明作者:Wang Beiyi
    申请人:Guangdong Polytechnic；
    IPC主号:
    专利说明:

    description
    Technical area
    The present invention belongs to the field of signal processing and, more particularly, relates to a control system of a laser coaxiality measuring device and a control method therefor.
    State of the art
    The coaxiality relates to the extent of the deviation of an actual axis of a measured surface from a reference axis. In practical work, it is often necessary to measure coaxiality, and for some important parts the properties of a product are directly influenced by its coaxiality. In some cases, if the coaxiality is poor, an assembled machine may not operate normally. According to a report from Monsanto, a chemical company in Texas, USA, 60% of vibration-related accidents are caused by an eccentric mechanical shaft, so measuring coaxiality must be of great importance. With the development of the precise inspection and the precise machining technology, great attention is paid to the coaxiality measuring technology with high accuracy at home and abroad, and great importance is attached to it. The coaxiality measurement with high accuracy represents a common technical challenge of the mechanical industry, which influences the manufacturing and assembly accuracy of large systems as well as their operating condition and service life and restricts the economic development of China.
    At present, there is no reliable measuring device with high accuracy available in the domestic and overseas markets, the technical key point and difficulty being in establishing a measurement reference line with a large span. As a rule, three methods are used to measure the coaxiality, namely the steel wire method, the laser collimator method and the micro-alignment telescope method. The steel wire method has a low level of accuracy. In the case of the micro-alignment telescope method, in addition to unclear imaging and large manual observation errors, continuous focusing for different measuring distances is required for a large measuring distance, which leads to a tiny change in the optical axis of the instrument, i.e. the collimation reference. A gap, which is required to enable a focusing movement, results in the lenses having different center-point deviations. During a measurement process, touching the instrument when focusing manually also leads to a random change in the optical axis, which limits the accuracy of the instrument. In order to increase the accuracy, measures have been proposed to stabilize the light beam.
    Due to the high brightness and the good alignment of the laser, the laser collimation technology is already used in the measurement of the coaxiality. The coaxiality measurement by the laser collimation method is characterized by quick measurement, good practicality and portability, and therefore such an instrument has wide application prospects.
    Due to the fast response speed, high resolution, the possibility of continuous testing, simple peripheral circuitry and low costs, a novel position-sensitive detector (PSD) is already being researched for practical application at home and abroad. However, a complete control system of a laser coaxiality measuring device is not yet available in the prior art.
    Disclosure of the invention
    The present invention has for its object to overcome the above disadvantages in the prior art to provide a control system of a laser coaxiality measuring device and a control method therefor, wherein with the device through the connections between a semiconductor laser, a PSD sensor, a Measurement amplification module, a one-chip computer module, an LED display module, a key module, a communication interface module and a PC, a control system of a laser coaxiality measuring device is realized. The method realizes a control method of a laser coaxiality measuring device.
    According to the invention, the object is achieved by:
    First technical solution
    A control system of a laser coaxiality measuring device comprises a semiconductor laser, a PSD sensor, a measurement amplification module, a one-chip microcomputer module, an LED display module, a key module, a communication interface module and a PC, the semiconductor laser being connected to the PSD Sensor is connected, the output of which is connected to an input of a measurement amplification circuit, wherein an output of the measurement amplification circuit is connected to an A / D conversion terminal of the one-chip computer module, wherein a P1 output of the one-chip computer module is connected to an input of the LED Display module connected, wherein a P2 input of the one-chip computer module is connected to an output of the key module, wherein the one-chip computer module is in bidirectional connection with the PC via the communication interface module;
    and a "Display error" button, a "Start measurement" button, a "End measurement" button, a "Settings" button and a "Reset" button are provided on the button module.
    It is further provided that the measurement amplification module comprises a PSD sensor measurement circuit and a PSD signal processing circuit; the PSD sensor measurement circuit has a terminal PI, a resistor box UR, a capacitor C1, a primary operational amplifier circuit, a resistor R3, a resistor R5, a resistor R6, a resistor R8, a secondary operational amplifier circuit, a resistor R10, a diode D and a terminal P2 includes; Pin 2 of connection P1 is connected to pin 4 of connection PI, one end of resistance box UR, one end of capacitor C1 and a ground wire, and the other end of capacitor 01 is connected to pin 3 of connection P1 and an adjustable end of resistance box UR is; the other end of the resistor box UR is connected to a + 5V power supply, pin 1 and pin 5 of the connection PI being connected to two input pins of the first primary operational amplifier circuit, one output pin of the primary operational amplifier circuit being connected in series with the resistor R3 and the resistor R6 is connected to an input pin of the secondary operational amplifier circuit, while the other output pin of the primary operational amplifier circuit is connected to an input pin of the secondary operational amplifier circuit through a series connection with the resistor R5 and the resistor R8, an output pin of the secondary operational amplifier circuit through a series connection with the resistor R10 respectively connected to the diode D and pin 1 of the terminal P2, the diode D being connected to the ground wire, the other output of the secondary operational amplifier circuit to pin 4 of the Terminal P2 is connected, and wherein pin 2 and pin 3 of terminal P2 are connected to the ground wire; the primary operational amplifier circuit comprises a model TL061 amplifier;
    and the secondary operational amplifier circuit comprises a model OP07 amplifier.
    It is further provided that the primary operational amplifier circuit comprises a capacitor O2, a resistor R1, a resistor box UR1, an amplifier A1, a capacitor 03, a resistor R2, a resistor box UR2 and an amplifier A2; the capacitor 02, the resistor R1 and the amplifier A1 are connected in parallel to each other, with a positive input of the amplifier A1 being connected to the ground wire, with pin 1 on one side of the amplifier A1 through a series connection with the resistance box UR1 on pin 5 of the amplifier A1 is connected and two pins on the other side are connected to -12 V or +12 V, the capacitor 03, the resistor R2 and the amplifier A2 are connected in parallel to each other, with a plus input of the amplifier A2 connected to the - ground wire where pin 1 on one side of amplifier A2 is connected to pin 5 of amplifier A2 through a series circuit with resistor box UR2 and two pins on the other side are connected to -12V or + 12V are connected.
    It is further provided that the secondary operational amplifier circuit comprises a resistor R4, a resistor box UR3, an amplifier A3, a resistor R7, a resistor box UR4, an amplifier A4 and a resistor R9; the resistor R4 and the amplifier A3 are connected in parallel to each other, a positive input of the amplifier A3 being connected to the ground wire, pin 1 on one side of the amplifier A3 being connected in series with the resistor box UR3 to pin 8 of the amplifier A3 and two pins on the other side of amplifier A3 are connected to -12 V and +12 V, respectively, with resistor R7 and amplifier A4 connected in parallel to each other, with a plus input of amplifier A4 connected in series with resistor R9 to the ground wire is connected, where pin 1 on one side of amplifier A4 is connected to pin 8 of amplifier A4 through a series circuit with resistor box UR4 and two pins on the other side of amplifier A4 are connected to -12 V or +12 V.
    It is further provided that the PSD signal processing circuit UR, a capacitor 03, 101, IC2, a capacitor 01, a resistor Rf1, a capacitor 02, a resistor Rf2, a resistor R1, a resistor R2, a resistor R3, a Resistor R4, resistor R5, resistor R6, resistor R7, IC3, IC4, IC5, IC6, resistor R8, and resistor R9; Pin 1 of UR is each connected to a minus input of 101 and one end of the resistor Rf 1, the capacitor 01 and the resistor Rf 1 being connected in parallel to one another, the resistor Rf 1 at the other end each being connected to one end of the resistor R1, an output of 101 and one end of resistor R4, the other end of resistor R1 being respectively connected to one end of resistor R5, a minus input of IC3 and one end of resistor R2, the other end of resistor R5 each connected to an output of IC3 and one end of resistor R8, the other end of resistor R8 each connected to one end of resistor R9 and a minus input of IC5, the other end of resistor R9 each connected to an output of IC5 and connected to IC6, with IC6 each connected to one end of resistor R6 and an output of IC4, the other end of resistor R6 respectively ls is connected to one end of resistor R3 and a minus input of IC4, with the other end of resistor R3 connected to the other end of resistor R2, one end of resistor Rf2 and an output of IC2, with capacitor 02 and the resistor Rf2 are connected in parallel with each other, the other end of the resistor Rf2 being connected to UR and a minus input of IC2, the other end of the resistor R4 being connected to a plus input of IC4 and to the resistor R7, respectively, where resistor R7 is connected to the ground wire, with plus inputs of 101, IC2, IC3 and IC5 each connected to the ground wire, where Pin
    3 of UR is each connected to capacitor C3 and a +10 power supply, and capacitor C3 is connected to the ground wire.
    It is also provided that the LED display module has a decoding drive chip U2, a decoding drive chip U3, a Nixie tube DS1, a Nixie tube DS2, a Nixie tube DS3, a Nixie tube DS4, a Nixie tube Includes tube DS5 anda Nixie tube DS6; the decoding drive chip U2 is connected to the Nixie tube DS1, the Nixie tube DS2, the Nixie tube DS3, the Nixie tube DS4, the Nixie tube DS5 and the Nixie tube DS6 and the decoding drive chip U3 is connected to it the Nixie tube DS1, the Nixie tube DS2, the Nixie tube DS3, the Nixie tube DS4, the Nixie tube DS5 and the Nixie tube DS6 is connected.
    It is further provided that the key module comprises a key switch SO, a key switch S1, a key switch S2, a key switch S3, a key switch S4, a resistor R30, a resistor R31, a resistor R32, a resistor R33 and a resistor R34 ; the key switch SO with the resistor R30, the key switch S1 with the resistor R31, the key switch S2 with the resistor R32, the key switch S3 with the resistor R33 and the key switch S4 with the resistor R34 is connected in series, the key switch SO, the Key switch S1, key switch S2, key switch S3 and key switch S4 are each connected to the ground wire, and resistor R30, resistor R31, resistor R32, resistor R33 and resistor R34 are respectively connected to VCC.
    Second technical solution
    A control method which is implemented on the basis of the control system of a laser coaxiality measuring device according to the first technical solution comprises the following steps:
    Step a: setting the height of the semiconductor laser before a measurement by means of the measuring device so that a laser beam strikes the center of an optical target, the LED display module displaying the value 0;
    Step b: starting a program and displaying a position signal of a stop on the LED display module;
    Step c: pressing the start key on the key module, pressing the measurement key after releasing the start key to perform the measurement of the first data, and releasing the measurement key to show a deviation value on the LED display module;
    Step d: moving the optical target disk to a second measurement position, pressing the start key and pressing the measurement key to carry out the measurement of the second data; and
    Step e: Continue the measurement as described above up to the measurement of the last data, hold down the End key, press the start key, press the measurement key after releasing the start key, the measurement of the last data is carried out and all data via the communication interface module to the PC for evaluation of the coaxiality error, and releasing the measurement button and the end button to end the measurement.
    It is also provided that the communication takes place by pressing a communication button in order to transmit the measured and processed data to the PC for processing.
    It is also provided that after a measurement process, the start button is pressed in order to restore the initial state and to carry out a next measurement process from the beginning.
    Compared to the prior art, the present invention is characterized by the following advantageous effects:
    The present invention provides a control system of a laser coaxiality meter and a control method therefor, wherein the device is provided by the connections between a semiconductor laser, a PSD sensor, a measurement amplification module, a one-chip computer module, an LED display module, a key module, a communication interface module and a personal computer, a control system of a laser coaxiality measuring device is realized which is advantageously characterized by high measurement accuracy, high resolution, high testing efficiency and low manufacturing cost, thus providing a novel means and a measuring device for measuring coaxiality with high accuracy. The method realizes a control method of a laser coaxiality measuring device.
    Brief description of the figures
    [0018]
    Figure 1 shows a structural block diagram of the present invention,
    Figure 2 shows a circuit diagram of the measuring circuit of a PSD sensor,
    Figure 3 shows a circuit diagram of a PSD signal processing circuit,
    FIG. 4 shows a circuit diagram of a connection circuit of a one-chip computer module (FIG. 4a shows a circuit diagram of a connection circuit of the upper half of the one-chip computer module and FIG. 4b shows a circuit diagram of a connection circuit of the lower half of the one-chip computer module),
    Figure 5 shows a circuit diagram of a communication interface module,
    Figure 6 shows a representation of a power supply module,
    FIG. 7 shows a flow chart of a main program of the one-chip computer,
    FIG. 8 shows a flow chart of an A / D conversion subroutine, and
    FIG. 9 shows a flow diagram of a display subroutine.
    Concrete embodiments
    The present invention will be discussed in more detail below with reference to the accompanying drawings.
    First concrete embodiment
    As can be seen from Figure 1, a control system of a laser coaxiality measuring device comprises a semiconductor laser, a PSD sensor, a measurement amplification module, a one-chip microcomputer module, an LED display module, a key module, a communication interface module and a PC . The semiconductor laser is connected to the PSD sensor, the output of which is connected to an input of a measurement amplification circuit, an output of the measurement amplification circuit being connected to an A / D conversion connection of the one-chip computer module, with a P1 output of the one-chip -Computer module is connected to an input of the LED display module, wherein a P2 input of the one-chip computer module is connected to an output of the key module, wherein the one-chip computer module is in bidirectional connection with the PC via the communication interface module.
    On the button module, a button "Display error", a button "Start measurement", a button "End measurement", a button "Settings" and a button "Reset" are provided.
    Working principle: A command is sent to the one-chip computer module via the key module, which performs processing based on the command. In the case of a measurement start command, using the semiconductor laser as a direct light source, an optical signal is converted into an electrical signal by detecting a change in the position of the light source by means of the PSD sensor, and amplification and addition and subtraction operation processing are carried out by means of the measurement amplification module. The signal is transmitted to an A / D conversion module connector of the one-chip computer module for A / D conversion and storage, and is displayed on the LED display module. The data is transmitted to the PC for data analysis.
    Specifically, the model of the semiconductor laser shown is DH670-0.9-3. Thus, small geometric dimensions, convenient assembly and high stability are achieved.
    Specifically, the PSD sensor is a position-sensitive detector. As the receiving element for photoelectric target in the present embodiment, it has the following advantages:
    1. High response speed: The response speed of the photoelectric conversion of PSD is inversely proportional to the product of the output resistance and the junction capacitance and is approximately a few ps. The response speed is lower than that of conventional photodiodes. Since it does not work with scanning, it has a considerably higher response speed compared to scanning light-sensitive components such as CCD.
    2. High resolution: The resolution of a CCD component depends on the pixel pitch and is usually more than ten micrometers. In the case of PSD components, due to the continuous sensitive surface, the resolution depends on the noise of an external test circuit and a photocurrent generated by an incident light and is usually a few tenths of a micrometer.
    3. Possibility of simultaneous detection of the position and the light intensity: Since the light intensity is related to the total optically generated current, a current output by a signal electrode can be added up by providing an additional line in order to obtain a total current so that the light intensity of the incident light can be determined accordingly.
    4. The position output is independent of the strength and size of the light spot and is only related to the position of the center of gravity of the light, so that no sophisticated and complicated optical collection system is required when using PSD and the size of the light spot does not affect the non-linearity of PSD exercises. A high non-linearity is only caused when the inner area of PSD is unevenness and when there is a light spot with a large diameter.
    5. Broad spectrum response range: The response range is from 330 to 1100 nm.
    6. Simple peripheral circuitry, convenient signal acquisition and lower price compared to photoelectric array components.
    Specifically, the measurement amplification module comprises a PSD sensor measurement circuit and a PSD signal processing circuit. As can be seen from Figure 2, the PSD sensor measurement circuit comprises a terminal PI, a resistor box UR, a capacitor CI, a primary operational amplifier circuit, a resistor R3, a resistor R5, a resistor R6, a resistor R8, a secondary operational amplifier circuit, a resistor R10, a diode D and a terminal P2. Pin 2 of connector P1 is each connected to pin 4 of connector P1, one end of resistor box UR, one end of capacitor C1 and a ground wire, and the other end of capacitor C1 is each connected to pin 3 of connector P1 and an adjustable end of resistor box UR connected, the other end of the resistor box UR is connected to a + 5V power supply, with pin 1 and pin 5 of connection P1 being connected to two input pins of the first primary operational amplifier circuit, one output pin of the primary operational amplifier circuit each being connected in series with resistor R3 and the resistor R6 is connected to one input pin of the secondary operational amplifier circuit, while the other output pin of the primary operational amplifier circuit is connected to an input pin of the secondary operational amplifier circuit through a series connection with the resistor R5 and the resistor R8, wherein a The output pin of the secondary operational amplifier circuit is connected to the diode D and pin 1 of the terminal P2 through a series circuit with the resistor R10, the diode D being connected to the ground wire, the other output of the secondary operational amplifier circuit being connected to pin 4 of the terminal P2 , and where pin 2 and pin 3 of terminal P2 are connected to the ground wire;
    The primary operational amplifier circuit includes a model TL061 amplifier.
    The secondary operational amplifier circuit comprises a model OP07 amplifier.
    Two current signals originating from the PSD sensor have a very low signal strength and are in the impA range. An upstream amplifier I / V conversion circuit must therefore have low noise and a high signal-to-noise ratio of the output in order to be able to amplify and extract usable signal. An I / V conversion noise source is thermal noise on a feedback resistor and equivalent input noise to the amplifier. By increasing the feedback resistance, for example to 1M, low frequency noise can be reduced. A second source of noise in the I / V conversion is an input leakage current of the operational amplifier. A J-FET operational amplifier is used to reduce the operational gain leakage current. A field effect transistor operational amplifier with high input impedance and low input current, for example LF356, TL071, etc., is therefore used as the upstream amplifier, i.e. the primary operational amplifier circuit.
    As a secondary operational amplifier, an operational amplifier OP07 with high accuracy is used in order to eliminate interference and to increase the signal-to-noise ratio and the measurement accuracy. To increase the resolution of the instrument, the two signals, which are amplified by the upstream amplifier, are added or subtracted and, after amplification to a different extent, fed to the one-chip computer for data acquisition. The measuring circuit of the PSD sensor is characterized by a stable signal, good linearity, very low zero point shift and thermal drift as well as high detection accuracy and can therefore meet the requirements of use.
    As can be seen from Figure 2, the primary operational amplifier circuit specifically comprises a capacitor O2, a resistor R1, a resistor box UR1, an amplifier A1, a capacitor 03, a resistor R2, a resistor box UR2 and an amplifier A2. the capacitor 02, the resistor R1 and the amplifier A1 are connected in parallel to each other, with a plus input of the amplifier A1 connected to the ground wire, with pin 1 on one side of the amplifier A1 through a series connection with the resistor box UR1 on pin 5 of the amplifier A1 is connected and two pins on the other side are connected to -12 V or +12 V, the capacitor C3, the resistor R2 and the amplifier A2 are connected in parallel to each other, with a positive input of the amplifier A2 connected to the ground wire where pin 1 on one side of amplifier A2 is connected to pin 5 of amplifier A2 through a series circuit with resistor box UR2 and two pins on the other side are connected to -12V or + 12V.
    As can be seen from Figure 2, the secondary operational amplifier circuit specifically includes a resistor R4, a resistor box URS, an amplifier AS, a resistor R7, a resistor box UR4, an amplifier A4 and a resistor R9. The resistor R4 and the amplifier AS are connected in parallel to each other,
    a plus input of amplifier A3 is connected to the ground wire, pin 1 on one side of amplifier A3 being connected in series with resistor box UR3 to pin 8 of amplifier A3 and two pins on the other side of amplifier A3 to -12 V and +12 V, respectively, with resistor R7 and amplifier A4 connected in parallel with each other, with a plus input of amplifier A4 connected to the ground wire through a series circuit with resistor R9, with pin 1 on one side of amplifier A4 connected in series with the resistance box UR4 to pin 8 of amplifier A4 and two pins on the other side of amplifier A4 are connected to -12 V and +12 V.
    As can be seen from Figure 3, the PSD signal processing circuit specifically includes an amplifier IC1, an amplifier IC2, an amplifier IC3, an amplifier IC4, an amplifier IC5, an amplifier IC6, a capacitor CI, a resistor Rfl, a Capacitor C2, resistor Rf2, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, and resistor R9. The capacitor C1 and the resistor Rfl are connected in parallel to one another. A minus input of the amplifier IC1 is connected to one end of the resistor Rfl, which resistor Rfl is connected at the other end to one end of the resistor R1, an output of the amplifier IC1 and one end of the resistor R4. The other end of the resistor R1 is connected to one end of the resistor R5, a minus input of the amplifier IC3 and one end of the resistor R2. The other end of resistor R5 is connected to an output of IC3 and one end of resistor R8, respectively. The other end of resistor R8 is connected to one end of resistor R9 and a minus input of IC5. The other end of resistor R9 is connected to an output of IC5 and to IC6, respectively. The capacitor C2 and the resistor Rf2 are connected in parallel to each other. A minus input of IC2 is connected to one end of resistor Rf2, which resistor Rf2 is connected at the other end to an output of IC2, the other end of R2 and one end of R3, respectively. The other end of R3 is connected to one end of R6 and a minus input of IC4. The other end of R6 is connected to an output of IC4 and to IC6, respectively. A plus input of IC4 is connected to the other end of R4 and one end of R7. Ground wire is connected to the other end of R7, a plus input of IC1, a plus input of IC2, a plus input of IC3, and a plus input of IC5.
    The amplifiers IC1 to IC6 each serve for the photocurrent-voltage conversion and as adders, subtractors and dividers and are used in application scenarios in which a high processing speed and real-time control are required.
    A divider is a possible application of a multiplier and it includes the models integrated linearly variable transconductance 4-quadrant multiplier MC1595L, multiplier of the second generation with output current amplifier, such as MC1594L / MC1494L, multiplier of the second generation with output voltage amplifier, such as AD530, AD532, BB4203, BB4205, etc., and powerful built-in analog multiplier using negative feedback such as AD534, AD634, BB4213, BB4214 etc.
    Specifically, the one-chip computer module comprises a one-chip computer of the model MSP430F149. As can be seen from FIG. 4, each of the pins of the connection PI and the connection P2 of the MSP430F149 is equipped with an interrupt function, so that a matrix keyboard can be easily implemented. At the same time, the function and the output direction of each of the pins can be determined individually and by providing a few additional function chips, a DA conversion and an LCD display can be made possible.
    P1.4 to PI .7 of the one-chip computer serve as an optional connection line for the LED display module and the rest of the connection P1 serves as an LED display circuit interface, with which the sensor channel number and the measurement result are displayed on a six-digit Nixie tube can be.
    The key module is connected to the connection P2. The key circuit consists of five function keys, namely a "Display error" key, a "Start measurement" key, a "End measurement" key, a "Settings" key and a "Reset" key.
    P3.3 and P3.4 serve as a second function connection for serial communication and for connection to the RS232C connection of the PC. Terminal P4 is connected to an input terminal of an address decoding circuit, provides a control signal for switching an electronic switch of a 100 channel, feeds a voltage signal from a sensor on an assigned channel into an A / D connection of the one-chip computer MSP430, performs A / D conversion using a 12-bit A / D module within the one-chip computer, packs the measurement data, and stores it in a data buffer cache in the one-chip computer. When the one-chip computer receives a data transfer command from PC software, the associated sensor data is sent via the RS232 communication interface circuit to the PC for data analysis.
    As can be seen from Figure 4b, the LED display module specifically comprises a decoding drive chip U2 of the model 74LS145, a decoding drive chip U3 of the model 74LS249, a Nixie tube DS1, a Nixie tube DS2, a Nixie tube DS3, a Nixie tube DS4, a Nixie tube DS5 and a Nixie tube DS6. The last four digits of the Nixie tube indicate a character and a three-digit deviation value, while the first two digits indicate a work station number and a number of repetitions. The decoder drive chip U2 is each with the Nixie tube DS1, the Nixie tube DS2, the Nixie tube DS3, the Nixie tube DS4, the Nixie tube DS5 and the Nixie tube
    DS6 connected and the decoder drive chip U3 connected to the Nixie tube DS1, the Nixie tube DS2, the Nixie tube DS3, the Nixie tube DS4, the Nixie tube DS5 and the Nixie tube DS6.
    The LED display module further comprises an 8D latch. The LED display module has the special feature that in contrast to other circuits in which two 377 latches are used to latch a segment code and a digit code of a digit to be displayed, a single 377 latch for latching a four-digit segment code and a four-digit digit code of a digit to be displayed is used. The 74LS249 converts an entered four-digit binary number from 0 to 9 into a seven-segment digit form and outputs this. The 74LS145 is a 4-10 decoder and four input lines can optionally be connected to ten output lines. Here, six output lines are used to display the job number and a job deviation value of the corresponding position. For display purposes, the digit shape can be displayed and the digit position can be controlled simply by executing a command. To facilitate the. A decimal number is displayed for observation and recording. With such a circuit, the construction of the hardware circuit and the display software are simplified.
    In Figure 4, the segment selection lines of all points are accordingly connected in parallel and are controlled by a seven-segment LED, so that the multiplexing of the segment selection line is realized, while a common anode of the individual point is controlled by 74LS145, which one time-dependent connection of the individual point is realized, so the display is carried out scanning. At a certain point in time, only the position selection line of a certain position is switched on and a digit code of the character to be displayed is output on the segment selection line, while the other positions do not light up. Due to the sluggishness of the human eyes, however, in the case of cyclical displays, the optical illusion that several places light up at the same time can be generated as long as the interval between displays of the individual places is sufficiently short. Thus, the task of displaying multi-digit data is accomplished. The interval between displays of different positions of the LED can be controlled by a time-controlled interrupt. An interval that is too short is not allowed because there is a certain delay between switching on and lighting up an LED, so that the switching-on time is too short and the seven-segment LED emits too weak light that is not clearly visible to the human eye. The interval cannot be too long either, since there is a restriction due to the critical gaze frequency and a longer interval leads to longer MCU occupancy, so that the number of elements and energy consumption are actually reduced for dynamic display at the expense of the MCU time.
    As can be seen from Figure 4a, the key module specifically comprises a key switch SO, a key switch S1, a key switch S2, a key switch S3, a key switch S4, a resistor R30, a resistor R31, a resistor R32, a resistor R33 and a resistor R34. The key switch SO is connected in series with the resistor R30, the key switch S1 with the resistor R31, the key switch S2 with the resistor R32, the key switch S3 with the resistor R33 and the key switch S4 with the resistor R34. The key switch SO, the key switch S1, the key switch S2, the key switch S3 and the key switch S4 are each connected to the ground wire. Resistor R30, resistor R31, resistor R32, resistor R33, and resistor R34 are each connected to VCC.
    The key module is characterized by flexible configuration and simple structure of an independent key circuit and is used with a sufficient number of I / O connections. Here, a single key circuit is formed by five wires from terminal P2. The buttons are used to control the following: display errors, start measurement, end measurement, setting and resetting. The buttons are LOWactive.
    Specifically, a serial connection of MSP430F149 is used to input and output a TTL level. Such a circuit is advantageously characterized by high speed, low energy consumption and low price. With an EIA level, the PC can work reliably in a noisy environment. Therefore, the PC and the one-chip computer must communicate via a level converter. A level converter MC1488 and MC1489 is usually used for this purpose, which means that a ± 12V power supply is required. There are also disadvantages such as insufficient operational stability and susceptibility of the integrated package to burning. TSC232 integrated chips available in the market are powered by a + 5V power supply and two sets of level conversion circuits are provided therein. The first group is used to convert +5 V to +10 V, while the second group is used to convert -10 V to + 10 V, which is suitable for conversion between the EIA level and the TTL level. The peripheral circuit is simple and no additional ± 12V power supply is required. The working current is only 5 mA. As can be seen from FIG. 5, the chip forms a communication interface between the PC and the one-chip computer, namely a communication interface module. After outputting a + 5V power supply through 16 pins, a voltage of +10 V and -10 V can be applied to 2 pins and 6 pins.
    The present invention further comprises a power supply module that supplies the one-chip computer and a PSD measurement circuit with power and the stability of which directly influences the stability of the one-chip computer and the individual chips that make up the PSD measurement circuit. It is thus the source of the chip noise. Therefore, providing a high quality power supply is a key point for achieving stable and reliable operation of the chip and high accuracy measurement.
    The power supply module includes an AC voltage LC matching part, a transformer, a rectifier section, a filter circuit, and a voltage stabilizing circuit.
    As can be seen from Figure 6, the power supply module specifically comprises a transformer T1, a bridge rectifier circuit B1, a bridge rectifier circuit B2, an electrolytic capacitor C1, an electrolytic capacitor C2, an electrolytic capacitor C3, a capacitor 04, a capacitor 05, a capacitor 06 , a voltage stabilization chip W1, a voltage stabilization chip W2, a voltage stabilization chip W3, a capacitor 07, a capacitor 08, a capacitor 09 and a terminal P3. Pin 1 of the connection P3 is connected to one end of the capacitor 07 and pin 3 of the voltage stabilization chip W1. The other end of the capacitor 07 is connected to pin 2 of the connection P3, the ground wire, pin 2 of the voltage stabilization chip W1, one end of the capacitor 04, one end of the electrolytic capacitor 01 and the bridge rectifier circuit B2. Pin 1 of the voltage stabilization chip W1 is connected to the other end of the capacitor 04, the other end of the electrolytic capacitor 01 and the bridge rectifier circuit B2, which bridge rectifier circuit B2 is connected to the transformer T1. Pin 3 of the connection P3 is connected to one end of the capacitor 08 and pin 3 of the voltage stabilization chip W2. The other end of the capacitor 08 is in each case with pin 4 and pin 5 of the connection P3 and one end of the capacitor 09, pin 2 of the voltage stabilization chip W2, pin 2 of the voltage stabilization chip W3, one end of the capacitor 05, one end of the capacitor 06, one end of the electrolytic capacitor 02, one end of the electrolytic capacitor 03, the ground wire and the transformer. The other end of the capacitor 09 is connected to pin 6 of the connection P3 and pin 3 of the voltage stabilization chip W3. Pin 1 of the voltage stabilization chip W2 is connected to the other end of the capacitor 05, the other end of the electrolytic capacitor 02 and the bridge rectifier circuit B1. Pin 1 of the voltage stabilization chip W3 is connected to the other end of the capacitor 06, the other end of the electrolytic capacitor 03 and the bridge rectifier circuit B1, which bridge rectifier circuit B1 is connected to the transformer T1.
    The working principle is as follows: An alternating current with a voltage of 220 V and a frequency of 50 Hz from a power grid first flows through the AC voltage LC adaptation part, which is formed by capacitors and inductors as energy storage elements. Since energy storage elements can serve to adapt the energy, the energy is released when the electrical energy decreases and the energy is stored when the energy increases. With the AC voltage LC matching part, which is formed on the basis of such a feature, the AC voltage component can be reduced considerably. The AC voltage with an effective value of 220 V is then converted into a working voltage with an effective value of 15 V or 8 V by means of the transformer. Via the bridge rectifier circuit, the alternating current is converted into a unidirectional direct current based on the unidirectional electrical conductivity of a diode. However, such a DC voltage has a large change in amplitude. The AC voltage component is filtered out by means of the filter circuit, while the DC voltage component is largely retained. Thus, a smooth DC voltage is obtained. However, the voltage value is still subject to the influence of the fluctuation in the mains voltage and the change in load, which is why a voltage stabilization circuit is required to protect the output voltage from external influence. An integrated voltage stabilizer of the W7800 series is used for voltage stabilization during the circuit. Since the circuit is intended to provide a high quality power supply, two sections are provided in addition to conventional circuits.
    One of the additionally provided sections is the upstream LC AC voltage adaptation part, with which the fluctuation of the AC voltage before it flows through the transformer is significantly reduced.
    The other of the additionally provided sections is a DC-DC isolating converter, whereby a single voltage can be converted into multiple voltage outputs that the circuit requires, which contributes to simplified circuit design. Furthermore, by disconnecting, the interference between the power supply circuit and the ground wire can be eliminated, thus simplifying complicated wiring. The 12D12-150 model is used for the DCDC isolating converter and a voltage of +12 is input and a voltage of ± 12 V and a current of 150 mA are output.
    The integrated voltage stabilizer of the W7800 series used in the circuit is characterized by high accuracy, small dimensions, convenient use, fixed or adjustable output voltage, expandable output current and numerous protective functions.
    With the support of the above paragraphs, the circuit can provide a power supply of high stability, thus ensuring the realization of the functions of the individual circuits that constitute the hardware of the coaxiality measuring device and their chips. Furthermore, an impairment of the accuracy of the individual circuits, which form the hardware of the coaxiality measuring device, and their chips due to the stability of the power supply and thus an impairment of the measurement result caused thereby, is excluded.
    Second concrete embodiment
    A control method implemented based on the control system of a laser coaxiality measuring device according to the first concrete embodiment comprises the following steps:
    权利要求:
    Claims (10)
    [1]
    A control system of a laser coaxiality measuring device, characterized in that the control system comprises a semiconductor laser, a PSD sensor, a measurement amplification module, a one-chip microcomputer module, an LED display module, a key module, a communication interface module and a PC, wherein the semiconductor laser is connected to the PSD sensor, the output of which is connected to an input of a measurement amplification circuit, an output of the measurement amplification circuit being connected to an A / D conversion port of the one-chip computer module, a P1 output of the one-chip -Computer module connected to an input of the LED display module, wherein a P2 input of the one-chip computer module is connected to an output of the key module, wherein the one-chip computer module is in a bidirectional connection with the PC via the communication interface module;
    and a "Display error" button, a "Start measurement" button, a "End measurement" button, a "Settings" button and a "Reset" button are provided on the button module.
    [2]
    2. Control system of a laser coaxiality measuring device according to claim 1, characterized in that the measurement amplification module comprises a PSD sensor measurement circuit and a PSD signal processing circuit; the PSD sensor measuring circuit has a terminal PI, a resistance box UR, a capacitor C1, a primary operational amplifier circuit, a resistor R3, a resistor R5, a resistor R6, a resistor R8, a secondary operational amplifier circuit, a resistor R10, a diode D and a terminal P2 includes; Pin 2 of connection P1 is connected to pin 4 of connection P1, one end of resistance box UR, one end of capacitor C1 and a ground wire, and the other end of capacitor C1 is connected to pin 3 of connection PI and an adjustable end of resistance box UR is; the other end of the resistor box UR is connected to a + 5V power supply, with pin 1 and pin 5 of the connection PI being connected to two input pins of the primary operational amplifier circuit, one output pin of the primary operational amplifier circuit being connected in series with the resistor R3 and the resistor R6 is connected to an input pin of the secondary operational amplifier circuit, the other output pin of the primary operational amplifier circuit being connected to an input pin of the secondary operational amplifier circuit through a series connection with the resistor R5 and the resistor R8, an output pin of the secondary operational amplifier circuit being connected by a series connection with the resistor R10 respectively connected to the diode D and pin 1 of the terminal P2, the diode D being connected to the ground wire, the other output of the secondary operational amplifier circuit to pin 4 of the terminal it is connected to P2, and where pin 2 and pin 3 of terminal P2 are connected to the ground wire;
    the primary operational amplifier circuit comprises a model TL061 amplifier;
    and the secondary operational amplifier circuit comprises a model OP07 amplifier.
    [3]
    3. Control system of a laser coaxiality measuring device according to claim 2, characterized in that the primary operational amplifier circuit comprises a capacitor 02, a resistor RI, a resistor box UR1, an amplifier A1, a capacitor 03, a resistor R2, a resistor box UR2 and an amplifier A2 ; the capacitor 02, the resistor R1 and the amplifier A1 are connected in parallel to each other, with a plus input of the amplifier A1 being connected to the ground wire, with pin 1 on one side of the amplifier A1 through a series connection with the resistance box UR1 on pin 5 of the amplifier A1 is connected and two pins on the other side are connected to -12 V and +12 V respectively; the capacitor 03, the resistor R2 and the amplifier A2 are connected in parallel to each other, with a positive input of the amplifier A2 being connected to the ground wire, with pin 1 on one side of the amplifier A2 through a series connection with the resistor box UR2 on pin 5 of the amplifier A2 connected and two pins on the other side to -12V or + 12V are connected.
    [4]
    A laser coaxiality meter control system according to claim 2, characterized in that the secondary operational amplifier circuit comprises a resistor R4, a resistor box URS, an amplifier A3, a resistor R7, a resistor box UR4, an amplifier A4 and a resistor R9; the resistor R4 and the amplifier A3 are connected in parallel to one another, a positive input of the amplifier A3 being connected to the ground wire, pin 1 on one side of the amplifier A3 being connected in series with the resistor box UR3 to pin 8 of the amplifier A3 and two pins on the other side of amplifier A3 are connected to -12 V and +12 V, respectively, with resistor R7 and amplifier A4 connected in parallel to each other, with a plus input of amplifier A4 connected in series with resistor R9 to the ground wire is connected, where pin 1 on one side of amplifier A4 is connected to pin 8 of amplifier A4 through a series circuit with resistor box UR4 and two pins on the other side of amplifier A4 are connected to -12 V or +12 V.
    [5]
    5. Control system of a laser coaxiality measuring device according to claim 1, characterized in that the PSD signal processing circuit UR, a capacitor 03, 101, IC2, a capacitor 01, a resistor Rf 1, a capacitor 02, a resistor Rf2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, IC3, IC4, IC5, IC6, a resistor R8 and a resistor R9; Pin 1 of UR is connected to a negative input of 101 and one end of the resistor Rf 1, the capacitor 01 and the resistor Rf 1 being connected in parallel to one another, the resistor Rf 1 at the other end each being connected to one end of the resistor R1 , one output of 101 and one end of resistor R4, the other end of resistor R1 being respectively connected to one end of resistor R5, a minus input of IC3 and one end of resistor R2, the other end of the resistor R5 is each connected to an output of IC3 and one end of resistor R8, the other end of resistor R8 being connected to one end of resistor R9 and a minus input of IC5, the other end of resistor R9 each being connected to a Output of IC5 and connected to IC6, with IC6 connected to one end of resistor R6 and an output of IC4, the other end of resistor R6 respectively s is connected to one end of resistor R3 and a minus input of IC4, the other end of resistor R3 being connected to the other end of resistor R2, one end of resistor Rf2 and an output of IC2, capacitor 02 and the resistor Rf2 are connected in parallel with each other, the other end of the resistor Rf2 being connected to UR and a minus input of IC2, the other end of the resistor R4 being connected to a plus input of IC4 and to the resistor R7, respectively resistor R7 is connected to the ground wire, with plus inputs of 101, IC2, IC3 and IC5 each connected to the ground wire, with pin 3 of UR each connected to capacitor 03 and a +10 power supply, and capacitor 03 connected to the ground wire.
    [6]
    6. Control system of a laser coaxiality measuring device according to claim 1, characterized in that the LED display module has a decoding drive chip U2, a decoding drive chip U3, a Nixie tube DS1, a Nixie tube DS2, a Nixie tube DS3, a Nixie -Tube DS4, a Nixie tube DS5 and a Nixie tube DS6 comprises; the decoding drive chip U2 is connected to the Nixie tube DS1, the Nixie tube DS2, the Nixie tube DS3, the Nixie tube DS4, the Nixie tube DS5 and the Nixie tube DS6 and the decoding drive chip U3 is connected to the Nixie tube. Tube DS1, the Nixie tube DS2, the Nixie tube DS3, the Nixie tube DS4, the Nixie tube DS5 and the Nixie tube DS6 is connected.
    [7]
    The control system of a laser coaxiality measuring device according to claim 1, characterized in that the key module comprises a key switch SO, a key switch S1, a key switch S2, a key switch S3, a key switch S4, a resistor R30, a resistor R31, a resistor R32, a resistor R33 and a resistor R34; the key switch SO with the resistor R30, the key switch S1 with the resistor R31, the key switch S2 with the resistor R32, the key switch S3 with the resistor R33 and the key switch S4 with the resistor R34 is connected in series, the key switch SO, the Key switch S1, key switch S2, key switch S3 and key switch S4 are each connected to the ground wire,
    and wherein resistor R30, resistor R31, resistor R32, resistor R33, and resistor R34 are each connected to VCC.
    [8]
    A control method implemented on the basis of a control system of a laser coaxiality measuring device according to claim 1, characterized in that the method comprises the following steps:
    Step a: setting the height of the semiconductor laser before a measurement by means of the measuring device so that a laser beam strikes the center of an optical target, the LED display module displaying the value 0;
    Step b: starting a program and displaying a position signal of a stop on the LED display module;
    Step c: pressing the start button on the key module, pressing the measurement button after releasing the start button to perform the measurement of the first data, and releasing the measurement button to show a deviation value on the LED display module;
    Step d: moving the optical target disk to a second measurement position, pressing the start key and pressing the measurement key to carry out the measurement of the second data; and
    Step e: Continue the measurement as described above up to the measurement of the last data, keep the end key pressed, press the start key, press the measurement key after releasing the start key, the measurement of the last data is carried out and all of them Data are transmitted via the communication interface module to the PC for evaluating the coaxiality error, and releasing the measurement button and the end button to end the measurement.
    [9]
    A control method of a laser coaxiality measuring device according to claim 8, characterized in that communication is carried out by pressing a communication button to transmit the measured and processed data to the PC for processing.
    [10]
    10. The control method of a laser coaxiality measuring device according to claim 8, characterized in that after a measuring operation, the start button is pressed to restore the initial state and to carry out a next measuring operation from the beginning.
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    同族专利:
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN201910777778.6A|CN110456712A|2019-08-22|2019-08-22|A kind of control system and its control method of laser coaxial degree measuring instrument|
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