• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Apparatus and method for measuring airflow in a duct, for example, a ventilation duct (300), comprising a sensor adapted to the duct comprising an ultrasonic transmitter and at least two ultrasonic receivers, and a control unit to which the ultrasonic transmitter and the ultrasonic receivers are connectable. The apparatus further comprises means for measuring the temperature. The method comprises measuring the air and / or sensor temperature in the duct with means for measuring the temperature, performing a sensor calibration measurement at that temperature if no sensor calibration has previously been performed at the measured temperature and / or within a predetermined temperature range, and determining and / or recording temperature compensation information of the air flow measurement result generated from the calibration measurement, in a memory, for example, in the memory of a control unit.
    公开号:FI20175665A1
    申请号:FI20175665
    申请日:2017-07-07
    公开日:2019-01-08
    发明作者:Jari Mikkonen；Teuvo Sillanpää；Timo Lagerstam；Erkki Seppäläinen
    申请人:Flaekt Woods Ab；
    IPC主号:
    专利说明:

    APPARATUS AND METHOD OF MEASURING AIR FLOW
    Field of the Invention
    The invention relates to an apparatus and a method for measuring air flow in, for example, a duct in a ventilation system.
    Background of the Invention
    It is essential for the operation of the ventilation system that the air flow in the air flow ducts is as planned. By examining the directions and velocities of the air flows in the ventilation ducts 15, it can be ensured that the system functions as desired. By measuring the directions and velocities of the air flow, it is also possible to perform various manual or automatic control operations in the system, for example.
    In the prior art, airflow has been measured by means of an element mounted or installed in a ventilation duct. Such airflow sensors cause pressure loss in the ventilation duct and produce sound.
    Also known in the art are ultrasonic flow sensors. A typical such prior art flow sensor is a volume flow meter based on measuring the average flow rate and its operation is based on measuring the travel time difference between the downstream and upstream ultrasound signals. The prior art also discloses so-called. hybrid flowmeters that operate on both travel time and doppler principles.
    Ultrasonic sensors are also known, in which the air flow rate is determined by the difference in the travel time of the ultrasonic signal received by the two channels adapted to the two channels at the same time.
    20175665 prh 07-07- 2017
    Prior art ultrasonic sensors for measuring airflow rates may be temperature sensitive, for example due to manufacturing tolerances or other characteristics of the sensors. This can be seen, for example, in a situation where there is no air flow 5 in the duct, i.e. the flow rate is zero. In this case, the air flow measurement result of the sensor may vary depending on the sensor and the ambient temperature of the sensor. Different sensor units may also behave differently as the temperature changes. In the case of phase difference measurement, different temperatures can cause phase difference between different receivers, whereby the accuracy of the measurement results changes as the temperature changes. Thus, prior art solutions cannot provide completely reliable measurement results under different conditions.
    It is also known to correct the effect of temperature by determining the temperature behavior of each sensor during the manufacture of the apparatus. The problem with such a solution is that such measurement and determination during the manufacturing process takes a lot of time during the manufacturing phase and thus increases the manufacturing costs. In addition, the calibration performed during the manufacturing phase cannot accommodate the 20 sensor environment and its changes.
    Brief Description of the Invention
    The apparatus for measuring air flow according to the invention is based on the use of ultrasound technology and on the measurement of the ultrasonic propagation time difference in a duct, for example in a ventilation duct, by means of the phase difference of the ultrasonic front. The solution of the invention can improve the accuracy of measurement based on ultrasound measurement and enable reliable operation of the ultrasound sensor under different conditions by generating individual temperature compensation coefficients or temperature compensation curves for different sensor individuals during normal operation.
    The method according to the invention is characterized by what is mentioned in the characterizing part of claim 1. The process according to the invention is further characterized by what is mai
    20175665 prh 07-07-2017 as claimed in claims 2 to 12. The apparatus according to the invention is characterized in what is mentioned in the characterizing part of claim 13. The apparatus according to the invention is also characterized by what is stated in claims 14-24.
    In a solution according to an embodiment of the invention, the ultrasonic air flow sensor measures the air temperature. If the temperature changes outside the validated range, the sensor will automatically send a calibration measurement request to the system and / or actuator. During calibration measurement, the airflow value is measured in a channel with substantially zero airflow and stored in memory. With the previous stored calibration measurement values and the new calibration measurement value, the equipment can automatically calculate the compensation curve, that is, the correction curve temperature. 15 With the latest recorded compensation measurement, the validated temperature range of the sensor increases. This allows the sensor to be calibrated at a variety of temperatures and reduces the number of calibration measurements performed over time as the sensor calibrated and validated temperature range expands with each measurement.
    In one embodiment of the invention, the air flow measurement result measured by the sensor is compensated for by temperature correction data determined by calibration.
    In one embodiment of the invention, the method transmits a calibration measurement request and / or a calibration measurement notification to the system prior to performing the calibration measurement.
    In one embodiment of the invention, the sensor calibration measurement 30 is performed by arranging the flow in the duct substantially to zero, and then recording the duct airflow rate measured by the sensor at that temperature. In one embodiment of the invention, the apparatus may comprise an adjusting and / or closing member which closes the air channel calibration measurement request and / or calibration means 35 on the basis of a background notification so that the air flow rate in the duct is substantially zero.
    20175665 prh 07-07- 2017
    In one embodiment of the invention, the apparatus may perform at least a first calibration measurement when the apparatus or system is started, initialized, commissioned, and / or when the system is serviced. In one embodiment of the invention, the apparatus may perform calibration at predetermined intervals. If the physical phenomenon causing the temperature correction changes over time, the automatic and adaptive correction will then adapt to the change through new calibration resets over time.
    Thus, the solution according to the invention can automatically determine the temperature compensation coefficient per sensor or the temperature compensation curve, by means of which the velocities of the air flows measured by the sensors are reliable at different temperatures. Individual temperature compensation coefficients or curves can be generated for different sensor individuals during normal operation. Thus, the solution of the invention does not require time-consuming sensor-specific temperature compensation coefficients during commissioning or manufacturing. When the compensation information is collected at the sensor's final installation location, the compensation information is also as accurate as possible as it is measured in the sensor's final operating environment. Calibration measurements at the final installation site also take into account the operation of other components and the measurement inaccuracies they cause at different temperatures.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The invention will now be described in more detail by way of Examples 30 with reference to Figures 1-4, in which:
    Figure 1 illustrates an operating principle of an embodiment of a flow sensor based on a phase difference measurement according to the invention;
    Fig. 2 shows a structure of an embodiment of a flow sensor based on a phase difference measurement according to the invention, Fig. 3 shows a diagrammatic representation of an embodiment of a flow sensor based on a phase difference measurement according to the invention;
    Fig. 4 shows an example of an ultrasonic transmission according to an embodiment of the invention.
    DETAILED DESCRIPTION OF THE INVENTION
    Figure 1 illustrates the operating principle of an air flow sensor according to an embodiment of the invention. The apparatus shown in Figure 1 comprises at least one ultrasound transmitter 100 and at least two ultrasound receivers 102, 104. During operation of the apparatus, the ultrasound transmitter 100 transmits ultrasound and the receivers receive the ultrasound transmitted by the ultrasound transmitter. The ultrasound transmissions received at the same time are then compared and their phase difference determined.
    Figure 1 also shows the wavefronts 25,106,108 of the ultrasonic transmitter 110. If the velocity v of the air stream 112 in the space between the transmitter and the receivers is zero, the wavefront 106 proceeds directly from the transmitter towards the receivers, perpendicular to the ventilation channel. In this situation, if both receivers 102, 104 are equidistant x from transmitter 100, ultrasonic transmissions received by receivers 102, 104 do not have a propagation time difference. This allows the apparatus to determine that the air velocity v between the ultrasonic transmitter 100 and the receivers 102, 104 is zero.
    If there is airflow in the space between the ultrasonic transmitter 100 and the receivers 102, 104, i.e., the velocity v of the airflow 112 is greater than zero, the wavefront 108 moves in the direction of the flow. Here
    The 20175665 prh 07-07-2017 apparatus detects a change in travel time difference by comparing the ultrasonic transmitter received by the receivers 102, 104 at the same time, and thereby determines the airflow direction and velocity v between the ultrasonic transmitter 100 and the receivers 102, 5104.
    Fig. 2 shows the structure of an air flow sensor according to an embodiment of the invention. The apparatus shown in Fig. 2 consists of a transmitter 10 100 perpendicular to the flow direction and two or more receivers 102, 104. If the flow direction 112 is from left to right, the phase difference. The phase difference is directly proportional to the mean flow rate v, the distance (x1 + x2) of the receivers 102, 104 and the ultrasonic frequency, but inversely proportional to the sound speed. For example, a 180 degree phase shift may correspond to an air flow velocity of 30 m / s. Ideally, distances x1 and x2 are equal in length, but the distance difference between distances x1 and x2 can be determined and compensated, for example, by measuring the static phase difference at a zero airflow rate. In practical installation, the values xl and x2 differ easily, although the aim is symmetry.
    In one embodiment of the invention, the distances x1 and x2 may be different, whereby a static phase difference is observed when the air is stationary. As the air flow rate increases in the direction at which the distance to the transmitter is greater, the phase difference decreases and becomes zero as the air flow rate moves the wavefront30 just by the distance difference x1 - x2 between the receivers. The distance difference can be corrected by resetting the static phase difference caused by the distance difference. The distance difference provides an additional temperature dependence which can be compensated by the method according to the invention if the distance difference is small compared to the distance between the sensors.
    In one embodiment of the invention, the distance (x1 + x2) between the receivers 102, 104 is 20 mm to 80 mm. The above
    By using a distance of 20175665 prh 07-07-2017, it is possible to ensure the most accurate measurement of the flow rate using the apparatus according to the invention.
    In the measuring method, ultrasound can be generated either continuously or pulsed depending on the tube geometry. In pulsed driving, the phase difference is measured from within the audio burst to the receivers 102, 104. By using pulsed driving, measurement errors due to sound reflections can be eliminated. It is advantageous to read the pulse from a flat area of the pulse. Another boundary condition can be obtained from the shortest distance between the receivers and transmitters, the pulse propagation time through the reflections, and the directivity of the transmitter. For example, if a 60 kHz ultrasonic transducer with a diameter of 10 mm is used, the pulse length suitable for a circular tube is roughly the diameter d of the tube divided by the speed of sound. 15 Since the measurement is based on phase measurement, the measurement is amplitude independent. The strength of the pulse to be transmitted is selected such that, at conventional receivers, a good signal is obtained and the signal-to-noise ratio is sufficiently high for further processing.
    Broadband sensors can be advantageously used in both measurement methods. For wideband sensors, the phase response is smoother than for narrowband resonance sensors. In narrowband sensors, the error due to resonant frequency deviations and Q-value variations is greater. Also, the rise times in broadband are shorter, which is important if pulsed driving is used. On the transmitter side, a low Q value means faster pulse response. The transmitter should be sufficiently directional, but still so that the beam hits the receivers at all flow rates. The beam width of the transmitter may be, for example, 20 ° to 40 °, preferably, for example, about 30 °.
    Figure 3 shows an apparatus for measuring air flow in accordance with an embodiment of the invention. The apparatus comprises one ultrasonic transmitter 35 and two receivers 102, 104 located on opposite sides of the ventilation duct 300. The ultrasonic transmitter 100 and the ultrasonic receivers 102, 104 are connected oh8
    20175665 prh 07-07-2017 to a mating unit 304 comprising measuring electronics, for example, means for measuring the travel time difference of the signals received by the receivers 102, 104 based on the phase difference. Based on the phase difference between the signals received by the receivers, the control unit 304 may determine the direction and velocity of the air flow in the ventilation duct. The control unit 304 may also control the ultrasonic signal transmitted by the ultrasonic transmitter. The control unit 304 may be integrated with the transmitter and / or receivers or may be a separate unit. If the control unit 304 is a separate unit, the ultra10 audio transmitter 100 and the ultrasound receivers 102, 104 may be wired or wirelessly connected to the control unit 304. The control unit 304 may also comprise a display device for displaying the measurement results. The control unit 304 may also transmit the measurement results to an external device, such as an air flow controller, a data processing device or a display device.
    In one embodiment of the invention, for example, microphones such as MEMS microphones may be used as the ultrasonic receiver. For example, the ultrasonic transmitter may have a frequency of 60 kHz, an operating period of 60 Hz, and a single pulse length of 250 microseconds. An exemplary embodiment of the signal form 400 transmitted by the ultrasonic transmitter is shown in Figure 4. Other frequency and pulse ratios may be used in the solution of the invention, and the signal form described above and shown in Figure 4 is only one example.
    In the solution according to the invention, the apparatus comprises a channel adaptable sensor comprising an ultrasonic transmitter and at least two ultrasonic receivers, and a control unit to which the ultrasonic transmitter and the ultrasonic receivers can be connected. The apparatus further comprises means for measuring the temperature. In the solution according to the invention, the apparatus measures the temperature of the air in the duct and / or the sensor with means for measuring the temperature. On this basis, the apparatus will perform a sensor calibration measurement at that temperature if no sensor calibration measurement has been performed previously at the measured temperature and / or within a certain temperature range within the specified en35 range. The equipment then determines and / or records the calibration measurement Fri
    20175665 prh 07-07- 2017 Temperature compensation information for the measurement of the airflow formed in the bay, for example, in the memory of the control unit.
    For example, the solution according to the invention may operate as follows.
    The sensor or equipment connected to the apparatus for measuring the temperature measures the temperature, for example continuously or at intervals. When the equipment detects a temperature at which the measurement has not yet been performed or a temperature range where the measurement has not yet been performed, the sensor sends a request to perform a calibration measurement.
    This can be done, for example, when the hardware is first started up. During the calibration measurement, the airflow in the duct can be substantially zeroed, for example, by means of a regulating or closing member in the duct. An air flow velocity measurement is then performed and the measurement results stored in memory. When the measurement is made with the airflow rate at zero, the phase difference measured by the sensor receivers is an error caused by temperature. The system has a predetermined temperature range within which the calibration is valid. In one example, the calibration measurement is valid within a temperature range of ± 2 ° C.
    If the air temperature changes outside the calibrated range, that is, outside of a predetermined amount of measured temperature range, in this example, more than two degrees from the measured temperature, the apparatus performs a new calibration measurement at the new temperature and stores it in memory. Based on the first calibration measurement and the new calibration measurements, it is possible to form a temperature compensation function, i.e. a temperature correction function, which compensates, i.e. corrects, the phase difference error 30 e.g., so that when the airflow is zero, the airflow velocity measured Multiple compensation measurements at different temperatures can be used to determine the correction function between those temperatures. After the measurement has been made, the validated temperature range 35 increases by one predetermined range, i.e. by two degrees in the example. If the detected airflow temperature changes outside the validated temperature range, the system will perform a new test10
    20175665 prh 07-07-2017 calibration measurement as described above and again the validated temperature range can be increased by a predetermined amount. With the new measurement results, the compensation curve can be redefined or refined, whereby the measurement accuracy of the sensor 5 under different conditions is improved with each measurement.
    As mentioned above, the sensor and / or the apparatus sends calibration measurement requests relatively frequently after the sensor is turned on, but during operation the number of calibration measurements decreases because the validated temperature range increases with each calibration measurement. As described above, the sensor and sensor system can compensate for sensor measurement error at various temperatures, individually and automatically, during normal operation and at the actual 15 sensor installation site. In this way, the measurement accuracy of the sensor can be improved without having to calibrate the sensor in advance, for example, during its manufacturing.
    The apparatus may be arranged to reset the calibration results and calibration data at specific time intervals, and thereafter resume the calibration. Thus, automatic and adaptive correction adjusts to changes in conditions through new calibration resets over time if, for example, the physical phenomenon causing the temperature correction changes over time. The above embodiment can also compensate for an offset error due to dusting or other aging and / or a change in it.
    Once the calibration measurement has been performed or a correction factor or correction curve has been determined from it, the results can be stored, for example, in 30 control units or control device. In one embodiment of the invention, at least the first calibration can be performed each time the hardware or system is started, initialized, commissioned, and / or serviced. In one embodiment of the invention, the calibration may also be performed at regular intervals so that the measurement operates optimally throughout the life of the equipment and can compensate for aging of the equipment.
    20175665 prh 07-07-2017 or wear related changes or factors such as channel fouling.
    In one embodiment of the invention, the ultrasonic receivers need not be on the opposite side of the ventilation duct to the ultrasonic transmitter, but it is also possible that the ultrasonic transmitter and one or more ultrasonic receivers are on the same side of the ventilation duct. If the ultrasonic transmitter and the ultrasonic receiver or receivers are on the same side of the ventilation channel, a surface reflecting the ultrasound emitted by the ultrasonic transmitter to the ultrasonic receiver or ultrasonic receivers is required on the opposite side of the ventilation channel sensors. The tube surface is preferably shaped or processed so that sound is effectively reflected back to the receivers.
    In one embodiment of the invention, a single ultrasonic transducer may be used as both an ultrasonic receiver and an ultrasonic transducer.
    The device for measuring the airflow according to the invention may be fixedly connected to the ventilation duct. In one embodiment of the invention, the ultrasonic transducer and the ultrasonic transducer sensors are fixedly mounted in connection with the ventilation duct, for example, on the inner surface of the ventilation duct. In another embodiment of the invention, the ultrasonic transducer and the ultrasonic transducers are integrally integrated into the tube so that at least part of the sensor structure is outside the tube and an aperture corresponding to the sensor transmitter and / or receiver is provided in the tube. The control unit of the apparatus according to the invention may also be integrated with the sensor or sensors, or the apparatus may comprise only connectors by means of which a separate control unit can be connected to the sensors. The advantage of sensors permanently installed in the components of the ventilation ducts, such as pipes, is that the components of the ventilation ducts 35 are easy to install and do not require separate adjustment or installation of the air flow sensors.
    The apparatus of the invention can be used for continuous airflow measurement or the airflow measurement can be set to occur at certain predetermined and / or selectable intervals.
    The apparatus for measuring the airflow according to the invention can be used to measure the airflow in various parts of the ventilation system, such as ducts, equalizer plates, fans, airflow controllers, iris regulators and probes.
    It will be apparent to one skilled in the art that the various embodiments of the invention are not limited solely to the examples set forth above, and may therefore vary within the scope of the following claims. If necessary, the symbols which may be presented in the specification together with other characteristics may also be used separately.
    权利要求:
    Claims (24)
    [1]
    20175665 prh 07-07- 2017
    1. A method for measuring airflow in a duct,
    5 in the ventilation duct (300), the apparatus characterized in that the apparatus comprises a duct-adjustable sensor comprising an ultrasonic transmitter (100) and at least two ultrasonic receivers (102, 104), and a control unit (304) to which the ultrasonic transmitter and the ultrasound receivers wherein the apparatus further comprises means for measuring temperature, and wherein:
    - measuring the temperature of the air in the duct and / or the sensor with the equipment,
    15,
    - the equipment performs a calibration measurement of the sensor at that temperature if the temperature measured at a given temperature and / or within a certain predetermined temperature range has not previously been located,
    20 sensor calibration performed, and
    - determining and / or storing in the apparatus, in the memory, for example, the memory of the control unit, the temperature compensation information of the air flow measurement result generated from the calibration measurement.
    [2]
    Method according to claim 1, characterized in that the method determines a temperature correction factor for the sensor for the measured temperature based on a calibration measurement.
    [3]
    Method according to claim 1 or 2, characterized in that the method determines a temperature correction curve for the sensor based on calibration data measured at different temperatures.
    [4]
    Method according to any one of the preceding claims, characterized in that in the method the air flow measurement result measured by the sensor is compensated on the basis of temperature correction data determined by calibration.
    [5]
    Method according to any one of the preceding claims, characterized in that the method transmits a calibration measurement request and / or a calibration measurement notification to the system before performing the calibration measurement.
    [6]
    A method according to any one of the preceding claims, characterized in that the sensor calibration measurement is performed by arranging the flow in the channel to substantially zero, and then storing the sensor
    15 measured by the duct air flow rate at that temperature.
    [7]
    A method according to any one of the preceding claims, characterized in that the apparatus comprises
    20, and / or a closure member which closes the air channel on the basis of the calibration measurement request and / or the calibration measurement notification so that the air flow rate in the channel is substantially zero.
    20175665 prh 07-07- 2017
    25
    [8]
    A method according to any one of the preceding claims, characterized in that the sensor calibration measurement is carried out again by the apparatus if the temperature changes to a temperature at a temperature and / or within a certain predetermined temperature range.
    30, no sensor calibration measurement has been performed yet.
    [9]
    Method according to any one of the preceding claims, characterized in that the apparatus resets 35 and / or removes the calibration measurement results and / or the temperature compression formed from the calibration measurements.
    20175665 prh 07-07-2017 at certain intervals and after that the hardware will start the calibration again.
    [10]
    A process according to any one of the preceding claims
    5, characterized in that the equipment transmits and / or stores the data determined by the calibration measurement to the controller unit or controller device.
    [11]
    A process according to any one of the preceding claims
    10, characterized in that the ultrasonic receivers (102, 104) are arranged in the channel such that the distance from both ultrasonic receivers (102, 104) to the ultrasonic transmitter (100) is substantially the same.
    [12]
    Method according to any one of the preceding claims, characterized in that the ultrasonic receivers (102, 104) are arranged in the channel such that the ultrasonic receivers (102, 104) and the ultrasonic transmitters
    The distances between the 20 men (100) are different.
    [13]
    Apparatus for measuring air flow in a duct, for example a ventilation duct (300), characterized in that:
    The apparatus comprising a channel adaptable sensor comprising an ultrasonic transmitter (100) and at least two ultrasonic receivers (102, 104), and a control unit (304) to which the ultrasonic transmitter and the ultrasonic receivers can be connected,
    30 wherein the apparatus further comprises means for measuring temperature, and wherein:
    - the apparatus is adapted to measure the temperature of the air in the duct and / or the sensor with means for measuring the temperature,
    35 - the apparatus is adapted to perform a sensor calibration measurement at that temperature, if a sensor calibration measurement has not previously been performed at the measured temperature and / or within a certain predetermined temperature range, and
    the apparatus is adapted to determine and / or store the temperature compensation information of the air flow measurement result formed on the basis of the calibration measurement in a memory, for example in the memory of the control unit.
    10
    [14]
    Apparatus according to claim 13, characterized in that the apparatus is adapted to determine a temperature correction factor for the sensor based on a calibration measurement.
    [15]
    An apparatus according to claim 13 or 14, characterized in that the apparatus is adapted to determine a temperature correction curve for the sensor based on calibration data measured at different temperatures.
    20175665 prh 07-07- 2017
    [16]
    Apparatus according to any one of the preceding claims 13 to 15, characterized in that the apparatus is adapted to compensate the air flow measurement result measured by the sensor on the basis of temperature correction data determined by calibration measurement.
    [17]
    Apparatus according to any one of the preceding claims 13 to 16, characterized in that the apparatus is adapted to send a calibration measurement request and / or a calibration measurement notification to the system prior to performing the calibration measurement.
    [18]
    18. Apparatus according to any one of the preceding claims 13 to 17, characterized in that the apparatus is adapted to perform a sensor calibration measurement by arranging the flow in the duct substantially to zero and then recording the duct airflow velocity measured by the sensor at that temperature.
    [19]
    Apparatus according to any one of the preceding claims 13 to 18, characterized in that the apparatus comprises an adjusting and / or closing member arranged in the closure.
    5 ground air channel based on the calibration measurement request and / or the calibration measurement notification so that the air flow rate in the channel is substantially zero.
    [20]
    The use of any one of the preceding claims 13-19
    10, characterized in that the apparatus is adapted to perform a sensor calibration measurement again if the temperature changes to such that a temperature and / or a temperature in a certain predetermined temperature range has not yet been performed.
    15 sensor calibration measurements.
    [21]
    Apparatus according to any one of the preceding claims 13 to 20, characterized in that the apparatus is adapted to reset and / or remove the calibration measurement.
    20, and / or temperature compensation data generated from the calibration measurements at certain time intervals, and thereafter the apparatus is adapted to start the calibration again.
    20175665 prh 07-07- 2017
    [22]
    Apparatus according to any one of the preceding claims 13 to 21, characterized in that the apparatus is adapted to transmit and / or store the data determined by the calibration measurement to the controller unit or controller device.
    [23]
    Apparatus according to any one of claims 13 to 22, characterized in that the ultrasonic receivers (102, 104) are arranged in the channel such that the distance from both ultrasonic receivers (102, 104) to the ultrasonic transmitter (100) is substantially the same.
    [24]
    Apparatus according to any one of claims 13 to 22, characterized in that the ultrasonic receivers (102, 104) are arranged in the channel such that the distances between the ultrasonic receivers (102, 104) and the ultra5 audio transmitter (100) are different.
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    法律状态:
    2018-08-31| PC| Transfer of assignment of patent|Owner name: FLA KTGROUP SWEDEN AB |
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    优先权:
    申请号 | 申请日 | 专利标题
    FI20175665A|FI128408B|2017-07-07|2017-07-07|Equipment and method for measuring an airflow|FI20175665A| FI128408B|2017-07-07|2017-07-07|Equipment and method for measuring an airflow|
    PCT/IB2018/054739| WO2019008473A1|2017-07-07|2018-06-27|Apparatus and method for measuring air flow|
    EP18755541.2A| EP3649441B1|2017-07-07|2018-06-27|Apparatus and method for measuring air flow|
    US16/617,537| US11237033B2|2017-07-07|2018-06-27|Apparatus and method for measuring air flow|
    DK18755541.2T| DK3649441T3|2017-07-07|2018-06-27|APPARATUS AND METHOD OF MEASURING AIR FLOW|
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