• 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:
    The invention relates to a measuring instrument for the measurement of parameters in melt, in particular for the measurement of the temperature, in particular in metal or cryolite melt with a melting point of more than 500 ° C, with the aid of an optical fiber for the measurement of the melt radiation and with a cable drum consisting of an outer circumference for receiving the optical fiber and an inner space surrounded by the outer circumference, and characterized in that in the inner space a distributor and a mode filter for the optical fiber be accommodated.
    公开号:BE1020061A3
    申请号:E2011/0432
    申请日:2011-07-07
    公开日:2013-04-02
    发明作者:
    申请人:Heraeus Electro Nite Int；
    IPC主号:
    专利说明:

    Measuring instrument for the measurement of parameters in melt
    The invention relates to a measuring instrument for the measurement of parameters in melt, in particular for the measurement of the temperature, in particular in metal or cryolite melt with a melting point of more than 500 ° C, with the aid of an optical fiber for the measurement of the radiation from the melt and with a cable drum, which consists of an outer circumference for receiving the optical fiber and an inner space surrounded by the outer circumference. The invention is further directed to a cable drum that is suitable for use in the measuring instrument that corresponds to the invention.
    Similar measuring instruments are known from, for example, LIS 6,227,702 B1 and DE 103 31 125 B3. Here an optical fiber is used for the measurement in the melt, the optical fiber being connected on the one hand to a measuring instrument and on the other hand to a dip lance for immersion in the melt. The optical fiber is supplied via a submersible lance feed mechanism and subsequently supplied in accordance with consumption, wherein it is unwound from a type of cable drum. The measurement procedure used for this is described sufficiently clearly in the above documents.
    With the relatively long optical fibers that are used (the length of which can be up to 100 meters), it has been found that the fiber measures the radiation at its immersion end with several so-called modes (also vibration modes). The different modes are muted in different intensities over the large length of the fiber and possibly changed by mutual influence. The course of the attenuation and therefore the change of the signal depends on the path that the light signal travels through the optical fiber. In total, for example, with a temperature measurement signal at about 1,600 ° C, this can lead to a deviation of much more than 10 ° C with a change in the length of the optical fiber due to the consumption of about 100 meters of optical fiber. In order to keep that deviation effect as small as possible with multiple measurements, a longer length of the optical fiber is often left on the cable drum and not consumed, but this way of working does entail additional costs.
    So-called mode filters are known from the telecommunications industry, in which the diameter of the optical fiber is specifically reduced at specific locations in order to eliminate the modes. This is readily possible in the telecommunications sector, since on the one hand the fibers are relatively constant in their length (they are not consumed) and on the other hand the light is transported in the so-called core of the optical fiber and not in the jacket. Just like the core, this mantle consists of quartz glass. In the telecommunications sector, fibers with a length of much more than one kilometer are regularly used. The modes gradually become weaker over such a distance and therefore have no disruptive effect.
    In metallurgy, and in particular for measurements, considerably shorter optical fibers (usually shorter than 500 m) are used, whereby the light is transported both in the core and in the jacket of the optical fiber and is therefore very unstable. This stability can be further affected during use by the strongly fluctuating temperatures to which the optical fiber is exposed.
    It is the intention of the invention described here to improve the available measuring instruments and to allow more accurate measurements.
    This assignment is fulfilled by the invention with the features of the independent claims. The advantageous further elaborations of the invention are described in the sub-claims. The previously defined measuring instrument is characterized in that a distributor and a mode filter for the optical fiber are accommodated in the inner space of the cable drum. As a result, the essential components for transporting the radiation are brought together in a relatively tight space and the interfering modes are filtered out, so that even with larger changes in the length of the optical fibers, the measurement precision in the melt is improved. For example, at a temperature of about 1,600 ° C in a melt, the measurement precision and the measurement consistency during the consumption of the quartz glass fiber are increased to a deviation of less than 10 ° C.
    The optical fiber consists of a core and a sheath, both made of quartz glass, as well as an envelope around the quartz glass, which can be made of metal, such as steel, at least along the length that is expected to be used, and which the quartz glass mechanically stabilizes. Over the length that is not consumable, the casing can also be made of plastic.
    A distributor is also called an "organizer". This serves, on the one hand, to compensate for possible deviations in lengths at different lengths of the optical fibers replaced after consumption, and, on the other hand, to compensate the consumable part of the optical fiber with another part that is not intended for consumption via an optical fiber connection (also called 'splice') ) to connect. The optical fiber not provided for consumption can be provided for connection to a signal converter or an electronic unit.
    Such organizers of a special kind are known in the telecommunications sector, for example, from US 5,802,237 A or, in other construction versions, from EP 1 377 862 B1. Other similar organizers used in the telecommunications sector are known from EP 229 662 A1, EP 903 594 A1, WO 2010/015846 A1, WO 2010/001156 A1 or WO 2008/017622 A1.
    However, they are provided for stationary applications and for non-consumable optical fibers, while the measuring instrument in the context of this invention is of course directed to the consumption of the optical fiber. Therefore, it is also advantageous to rotatably attach the cable drum to a support of the measuring instrument, or more generally to a holder.
    The carrier can be constructed as a frame and / or be provided with a housing on which individual components of the measuring instrument can be placed. The cable drum can be placed inside or outside that housing. A rotatable wheel or a rotatable holder can be provided on the carrier, to which the cable drum is attached and which can thus be connected to the carrier. The carrier can in particular be of mobile design, so that the measuring instrument can easily be transported to the place where it is needed. Wheels and a handle can for instance be provided for this purpose. The cable drum can be accommodated in a housing which is equipped with other operating elements and / or electronic components.
    A holder can be provided on the carrier, to which the immersion lance used during the measurement can be attached during the pauses between the measurements. It is advantageous for the carrier to be provided with a power supply for the optical fiber and optionally a control panel for operating or controlling the power supply of the optical fiber and the measuring installation as such. To this end, an indication may be integrated in the instrument panel.
    For practical reasons, the cable drum can be detached from the carrier, so that a rapid replacement (for example after the optical fiber has been used up) is guaranteed. A detector and / or memory and / or signal converter and / or an electrical interface can preferably be accommodated in the inner space of the cable drum. The detector and the signal converter serve to capture the light signal and to convert the received light into electrical signals. The memory serves to store, for example, the consumption of the optical fiber and the electrical interface allows the connection of the measuring instrument to installations in laboratories, computers, etc. For practical reasons, the detector can be placed inside a housing of the signal converter, which fiber connected to an electrical line. When a common housing is used, the components can be protected against external influences, so that both optical, electrical or electromagnetic and mechanical influences can be prevented.
    It is furthermore advantageous that an optical fiber connection - a so-called "splice" is placed in the interior space of the cable drum. In this way fibers of different types are interconnected, for example the optical fiber used for the measurement, which is provided with a metal sheath and which extends from a possibly used dip lance over the repeatedly wound coil on the outer circumference of the cable drum into the inner space and which is connected there with another fiber, for example an optical fiber that is only equipped with a plastic sheath. This optical fiber, which is preferably encased in plastic, is then, for example, connected to the detector in the housing of a signal converter. It is therefore recommended that two optical fibers are interconnected by splice in the interior, preferably using a welded joint.
    For practical reasons, the mode filter comprises a part of the optical fiber guided in a closed circuit, and in particular in a circuit. For practical reasons, the optical fiber runs in 1-20 turns on the closed curve. For practical reasons, this closed circuit has a minimum diameter of 1 cm - 6 cm. Such a mode filter, which can in principle be constructed like a small cable drum, disrupts modes, in particular in the fiber envelope, of the fiber. It is advantageous for the mode filter to be surrounded at its periphery by the distributor (organizer), i.e. placed inside the distributor. It is furthermore useful that the inner space of the cable drum is mechanically and / or electromagnetically sealed.
    It is useful that in the measuring instrument, in particular in the housing of the carrier, a detector, an end of an optical fiber connected to the detector and a band-pass filter are inseparably connected to each other and are preferably sealed against moisture and stray light. In addition or alternatively, it may be useful for a core of an optical fiber connected to a detector on the one hand and to the optical fiber rolled up on the cable drum on the other to have an equivalent or smaller diameter at its end connected to the detector than the one on the end cable drum wrapped optical fiber. A mode filter is also used for such an arrangement.
    In addition, the measuring instrument can be equipped with an antenna for wireless signal transmission, so that the measuring instrument can be used even more flexibly.
    The invention furthermore uses a cable drum for use in a measuring instrument that meets the requirements of the invention.
    The invention is explained in more detail below with reference to exemplary embodiments shown in drawings. In the drawing:
    Fig. 1 shows the schematic representation of a measuring instrument according to the invention
    Fig. 2 is a schematic representation of the cable drum according to the invention
    Figure 1 shows by way of example one of the possible embodiments of the measuring instrument according to the invention. The instrument consists of a movable carrier 1, which is also movable due to the use of the wheels 2. A so-called crust crusher 4 can be attached to a frame 3 of the carrier 1, with which a slag lying on the metal melt or, for example, a steel smear can be broken, so that the immersion lance 5 also secured to the carrier 1, through which an optical fiber 6 runs, can be introduced into the melt. There, the radiation takes place in the optical fiber 6 for the measurement. The temperature of the melt can be determined from the radiation in the known manner.
    The carrier 1 is equipped with a housing 7 closed on all sides, in which the cable drum 8 is removably attached to a rotatable wheel 9. The cable drum 8 is removably attached to the rotatable wheel 9 by a holder 10. In addition to the cable drum 8, there is at least one fiber supply device 11 within the closed housing 7, with which the optical fiber 6 of the rotatable cable drum 8 can be supplied constantly or depending on the demand through a protective casing 12 in the immersion lance 5.
    At the top of the housing 7, next to the passage of the protective case 12, an antenna 13 is placed for the wireless transmission of data. Furthermore, an instrument panel 14 with a display is located on the top of the housing 7.
    Figure 2 shows the inner space of the cable drum 8. The holder 10 is recognizable in the center point, with which the cable drum 8 is attached to the carrier 1 within the housing 7. The optical fiber 6 is wound around the outer circumference of the cable drum 8. The optical fiber 6 is made of quartz glass surrounded by a steel tube. Within the steel tube of the optical fiber 6, it consists of a core of quartz glass and a jacket which is also made of quartz glass. An end of the optical fiber 6 is inserted through an opening 15 in the outer casing surface of the cable drum 8 into the inner space 16 of the cable drum 8 and is guided therein with the aid of guide rails 17 on the inner peripheral surface of the cable drum into the distributor 18. There, the optical fiber 6 is passed through various guide elements 30 arranged in the distributor through the mode filter 21 into the so-called optical fiber connection 19, a so-called "splice". Here, one end of the optical fiber 6 is welded together with another optical fiber 20.
    The mode filter 21 is equipped with a circular coil 22 surrounded as far as possible by a line 23, the optical fiber 6 being wound around the coil 22 in approximately 5 turns in a gap between the line 23 and the coil 22. The windings of the optical fiber 6 formed thereby have a diameter of about 4 to 5 cm, so that disturbing modes are gradually eliminated by the small diameter.
    The optical fiber 20 consists of a core and a quartz glass sheath arranged over it. The optical fiber 20 is optionally fed within the distributor 18 over various guide elements 30 to a loop at the outlet 25 of the distributor 18 and from there to a detector 26. The two optical fibers 6 and 20 are guided by the guide elements 30 over different levels so that they do not touch each other.
    The detector 26 is sealed against electromagnetic radiation and stray light. It is connected to a conductive plate 27 which, inter alia, comprises a memory unit in which data about the consumption of the cable, the measured values of the temperature and other data can be stored. Connected to the conductive plate 27 is a cable 28 which forms a coupling 29 for the further transmission of electrical signals to underlying devices, such as computers.
    权利要求:
    Claims (17)
    [1]
    A measuring instrument for measuring parameters in melt, in particular for measuring the temperature, in particular in metal or cryolite melt, having a melting point of more than 500 ° C, with an optical fiber for measuring the radiation from the melt and with a cable drum consisting of an outer circumference for receiving the optical fiber and an inner space surrounded by the outer circumference and characterized in that a distributor and a mode filter for the optical fiber are accommodated in the inner space.
    [2]
    Measuring instrument according to claim 1, characterized in that the cable drum is rotatably mounted on a carrier.
    [3]
    Measuring instrument according to claim 2, characterized in that the carrier is provided with a power supply for the optical fiber and / or a control panel.
    [4]
    Measuring instrument according to claim 2 or 3, characterized in that the cable drum can be detached from the carrier.
    [5]
    Measuring instrument according to at least one of claims 1 to 4, characterized in that a detector and / or a memory for the data and / or a signal converter and / or an electrical interface is located in the inner space of the cable drum.
    [6]
    Measuring instrument according to claim 5, characterized in that the detector is housed within a housing of the signal converter, which connects the optical fiber to an electrical line.
    [7]
    Measuring instrument according to at least one of claims 1 to 6, characterized in that an optical fiber connection is present in the inner space. (
    [8]
    Measuring instrument according to claim 7, characterized in that two optical fibers are interconnected by so-called spllces in the inner space, wherein a welding connection is preferably used.
    [9]
    Measuring instrument according to at least one of claims 1 to 8, characterized in that the mode filter comprises an arrangement of a part of the optical fiber running on a closed curve, in particular on a circuit.
    [10]
    Measuring instrument according to claim 9, characterized in that the optical fiber runs over the closed curve in 1 to 20 turns.
    [11]
    Measuring instrument according to claim 9 or 10, characterized in that the smallest diameter of the curve is 1 cm to 6 cm.
    [12]
    Measuring instrument according to at least one of claims 9 to 11, characterized in that the mode filter is surrounded at its periphery by the distributor.
    [13]
    Measuring instrument according to at least one of claims 1 to 12, characterized in that the inner space of the cable drum is mechanically and / or electromagnetically sealed.
    [14]
    Measuring instrument according to at least one of claims 1 to 13, characterized in that a detector, an end of an optical fiber connected to the detector and a band-pass filter are inseparably connected to each other and are preferably sealed against moisture and stray light.
    [15]
    Measuring instrument according to at least one of claims 1 to 14, characterized in that a core of an optical fiber connected to a detector on the one hand and to the optical fiber rolled up on the cable drum on the other hand has an equally large end on the end connected to the detector or smaller in diameter than the optical fiber rolled up on the cable drum.
    [16]
    Measuring instrument according to at least one of claims 1 to 15, characterized in that an antenna is arranged on the measuring instrument for the wireless transmission of signals.
    [17]
    A cable drum for use in a measuring instrument according to at least one of claims 1 to 16.
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    同族专利:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011012174|2011-02-23|
    DE102011012174.9A|DE102011012174B4|2011-02-23|2011-02-23|Measuring device for measuring parameters in melts|
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