CN210664815U - Anti-crosstalk multi-core multi-measuring-point optical fiber high-temperature sensor structure - Google Patents
Anti-crosstalk multi-core multi-measuring-point optical fiber high-temperature sensor structure Download PDFInfo
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- CN210664815U CN210664815U CN201921959760.XU CN201921959760U CN210664815U CN 210664815 U CN210664815 U CN 210664815U CN 201921959760 U CN201921959760 U CN 201921959760U CN 210664815 U CN210664815 U CN 210664815U
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Abstract
The utility model provides a pair of multicore multi-measuring point optic fibre high temperature sensor structure of anti-crosstalk. The multi-core multi-measuring-point optical fiber high-temperature sensor structure comprises a hollow metal shell with openings at two ends, a carbon rod, a metal armor tube, a beam splitter, at least two optical fibers, an optical fiber temperature measuring sensitive element and at least two optical fiber connectors; the carbon rod is arranged in the metal shell, two ports of the metal shell are sealed through the sealing plug and the connector, the optical fiber and the optical fiber temperature measuring sensing element are respectively embedded in the groove on the surface of the carbon rod, two ends of the metal armor tube are respectively fixedly connected with the connector and the beam splitter, and the optical fiber and the tail fiber of the optical fiber sensing element penetrate through an optical fiber hole in the connector to be arranged in the metal armor tube and are correspondingly welded with the tail fiber of the optical fiber connector introduced into the metal armor tube through the beam splitter. The utility model discloses under the condition that does not increase sensor overall dimension, can improve the measurement density of sensor under limited space environment through the cross arrangement of temperature measurement sensing element on the different optic fibre.
Description
Technical Field
The utility model belongs to the technical field of the precision measurement, specifically be a multicore multi-measuring-point optical fiber high temperature sensor structure that relates to an anti-crosstalk can be used to the multiple spot distributing type precision measurement of high temperature such as heat-generating body or pipeline fluid in fields such as nuclear industry, aerospace, chemical industry, metallurgical equipment/equipment.
Background
In the fields of nuclear industry, aerospace, chemical industry, metallurgical equipment/equipment and the like, the temperature of a heating body or pipeline fluid needs to be accurately and reliably measured, the measured temperature is usually higher than 300 ℃, and the extreme temperature of some special parts even exceeds 1000 ℃. Meanwhile, in order to overcome the limitation on the structural size of the temperature sensor in practical application and the requirements of electromagnetic interference resistance and nuclear radiation resistance of the use environment, the optical fiber high-temperature sensor is an ideal temperature measurement scheme.
The optical fiber temperature sensor senses the external temperature change through an optical signal by taking an optical fiber as a medium. The optical fiber is generally made of quartz or sapphire with a higher melting point and other crystal materials, has the characteristics of no electricity, small volume, radiation resistance, high and low temperature resistance and the like, and is particularly suitable for being used in dangerous (inflammable and explosive), radiation, space-limited and other severe environments, so that the optical fiber temperature sensor has wide application prospects in the fields of aerospace, weaponry, nuclear industry and the like.
However, in the application fields with limited special space, such as nuclear industry, aerospace, high-temperature equipment/equipment and the like, the high requirements on the density and the responsiveness of temperature measuring points are provided. The sensor has the advantages that the sensor meets high-density multi-measuring point requirements, meanwhile, the structural size of the sensor is greatly limited, and the requirements on the measurement accuracy and the temperature measurement range of the sensor are high. In the traditional optical fiber temperature sensor, only a single sensitive element can be arranged at each measuring point, and the measuring point density of one optical fiber is very limited, so that the requirement of high-density temperature measurement is difficult to meet, thereby restricting accurate measurement of the temperature field distribution of equipment/devices.
Disclosure of Invention
In order to solve the temperature sensor miniaturization of special space restricted application fields such as nuclear industry, aerospace, chemical industry, metallurgical equipment/equipment, the temperature sensor of high space-time precision, the integrated technological problem of big density, the utility model provides an anti-crosstalk multicore multi-measuring point optic fibre high temperature sensor structure, this high temperature sensor can carry out the free design of multicore multiple temperature measurement point and mutual noninterference in single temperature sensing metal casing, realizes sensing unit's miniaturization and high density integration to reach equipment/device temperature distribution more accurate measurement.
The patent of the utility model discloses a solve the technical scheme that its technical problem adopted and do: the anti-crosstalk multi-core multi-measuring-point optical fiber high-temperature sensor structure comprises a hollow metal shell with openings at two ends, a carbon rod, a metal armor tube, a beam splitter, at least two optical fibers, an optical fiber temperature measuring sensitive element and at least two optical fiber connectors; the outer surface of the carbon rod is provided with at least two grooves along the length direction of the carbon rod, at least two optical fibers and optical fiber temperature measurement sensitive elements are respectively embedded into the grooves of the carbon rod, the carbon rod embedded with the optical fibers and the optical fiber temperature measurement sensitive elements is arranged in a hollow metal shell, two ports of the metal shell are sealed through a sealing plug and a connector, and optical fiber holes are correspondingly formed in the connector; two ends of the metal armor pipe are respectively fixedly connected with the connector and the beam splitter, and the at least two optical fibers and the tail fibers of the optical fiber temperature measuring sensing elements penetrate through the optical fiber holes in the connector and are arranged in the metal armor pipe and are correspondingly welded with the tail fibers of the optical fiber connectors led into the metal armor pipe through the beam splitter.
The utility model discloses further technical scheme: the optical fiber and the optical fiber in the optical fiber temperature measuring sensitive element adopt any one of quartz optical fiber, sapphire optical fiber, YAG crystal optical fiber and photonic crystal optical fiber; the optical fiber temperature measurement sensitive element can adopt any micro-nano processing structure of an optical fiber grating, an F-P cavity and an MZ cavity which are engraved by an excimer laser or a femtosecond laser.
The utility model discloses further technical scheme: the carbon rod is a cylindrical carbon rod of a carbon arc gouging machine, the diameter and the length of the carbon rod are matched with those of the metal shell, and 2-8 grooves with inverted isosceles trapezoid cross sections are formed in the outer surface of the carbon rod; the optical fiber and the optical fiber temperature measuring sensitive element are embedded into the inverted isosceles trapezoid groove of the carbon rod, and the optical fiber is kept in a loose state without obvious bending.
The utility model discloses further technical scheme: the optical fiber beam splitter is an optical fiber beam physical space separation component which is divided into two or four or eight, the metal armor tube is fixedly connected with a single-hole end of the optical fiber beam splitter, at least two optical fiber connectors are respectively connected with a multi-hole end of the optical fiber beam splitter, tail fibers of each optical fiber connector are led out from the multi-hole end of the optical fiber beam splitter and led out from the single-hole end, and the optical fiber connectors and the optical fiber beam splitter are fixed in a glass bead welding mode or a high-temperature glue bonding mode.
The utility model discloses better technical scheme: the metal shell, the sealing plug, the connector, the metal armor tube and the beam splitter are fixed in a sealing mode through metal welding, threaded connection or high-temperature glue bonding.
The utility model discloses better technical scheme: the metal shell adopts a stainless steel pipe, a copper pipe, a nickel alloy pipe or a Kovar alloy pipe.
The utility model discloses further technical scheme: the optical fiber connectors are various optical fiber connectors of SC, ST and FC types according with the optical fiber connection standard.
According to the above technical scheme, the utility model discloses following beneficial effect has:
(1) the utility model implants the multicore fiber and the fiber temperature measurement sensitive element in the same temperature sensing metal shell, under the condition of not increasing the overall dimension of the sensor, the measurement density of the sensor is improved under the limited space environment by the cross arrangement of the temperature measurement sensitive elements on different fibers, and the more accurate distributed measurement and representation of the temperature field are realized;
(2) the multi-core optical fiber and the optical fiber temperature measurement sensitive elements are respectively embedded into the trapezoidal grooves on the outer wall of the carbon rod, so that mutual interference among the optical fibers and the optical fiber temperature measurement sensitive elements is prevented under the condition of not increasing the response time of the sensor, and more reliable distributed measurement and characterization of a temperature field are realized;
(3) the utility model provides an its simple manufacture of multicore multiple measuring points optic fibre high temperature sensor, the design of carrying out different grade type temperature sensing element on different optic fibre that can be more convenient has improved the application demand that realizes different precision, different measuring range on different positions.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural view of a carbon rod according to the present invention;
FIG. 3 is a cross-sectional view of a carbon rod.
In the figure: the optical fiber temperature measurement device comprises a metal shell, 2-a carbon rod, 2-1-a groove, 3-an optical fiber and optical fiber temperature measurement sensing element, 4-a sealing plug, 5-a connector, 6-a metal armored pipe, 7-a beam splitter and 8-an optical fiber connector.
Detailed Description
The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 3 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the purpose of the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The optical fiber in the optical fiber temperature measuring sensitive element 3 and the optical fiber in the optical fiber temperature measuring sensitive element can adopt any one of quartz optical fiber, sapphire optical fiber, YAG crystal optical fiber and photonic crystal optical fiber; the optical fiber temperature measurement sensitive element can adopt any micro-nano processing structure of an optical fiber grating, an F-P cavity and an MZ cavity which are engraved by an excimer laser or a femtosecond laser. The metal shell adopts a stainless steel pipe, a copper pipe, a nickel alloy pipe or a Kovar alloy pipe. The optical fiber connectors 8 are various optical fiber connectors of SC, ST and FC types according with the optical fiber connection standard.
The anti-crosstalk multi-core multi-measuring-point optical fiber high-temperature sensor structure provided in the embodiment is characterized in that: the multi-core multi-measuring-point optical fiber high-temperature sensor structure comprises a hollow metal shell 1 with openings at two ends, a carbon rod 2, a metal armor tube 6, a beam splitter 7, four optical fibers, an optical fiber temperature measuring sensitive element 3 and four optical fiber connectors 8; the metal shell 1 is made of stainless steel capillary tubes, the length, the inner diameter and the outer diameter of the metal shell are respectively 400mm, 3.5mm and 4mm, and the metal shell has the advantages of small volume, high heat transfer speed, corrosion resistance and the like; as shown in fig. 2 and 3, the carbon rod 2 is a cylindrical carbon rod of a carbon arc gouging, the length and the diameter of the carbon rod are respectively 300mm and 3mm, the carbon rod has stable performance in a high-temperature environment, 4 inverted trapezoidal grooves 2-1 are formed at intervals of 90 degrees along the circular cross section, four optical fibers and optical fiber temperature-measuring sensitive elements 3 are respectively embedded into the inverted isosceles trapezoidal grooves 2-1 of the carbon rod 2, and the optical fibers are kept in a loose state without obvious bending. The optical fiber and the optical fiber temperature measuring sensitive element 3 in the embodiment select 4 polyimide coated pure quartz optical fibers and a II-type optical fiber grating array carved by a femtosecond laser, and the long-term working temperature can reach more than 300 ℃.
As shown in fig. 1, a carbon rod 2 embedded with an optical fiber and an optical fiber temperature measurement sensing element 3 is arranged in a hollow metal shell 1, two ports of the metal shell 1 are sealed through a sealing plug 4 and a connector 5, the sealing plug 4 is a cylindrical stainless steel welding plug with an outer diameter of 4mm, the connector 5 is designed into a hexagonal stainless steel welding connector with an annular groove and a through hole formed in the center, the annular groove is directly 4mm, and the diameter of the central through hole is 3 mm; the metal armor tube 6 is a stainless steel hose armor sheath, the outer diameter of the metal armor tube is 3.5mm, two ends of the metal armor tube are fixedly connected with the single-hole ends of the connector 5 and the beam splitter 7 respectively, the beam splitter 7 is a 1-in-4 type optical fiber cable beam splitter, and four optical fibers and tail fibers of the optical fiber temperature measurement sensitive element 3 penetrate through optical fiber holes in the connector 5 and are arranged in the metal armor tube 6; optical fiber connector 8 chooses single standard FC type optical fiber connector for use, and its external diameter is 900um, and four optical fiber connector 8 are connected with the porous end of beam splitter 7 respectively to introduce the tail fiber of every optical fiber connector 8 from the porous end of beam splitter 7 and draw forth by the haplopore end, correspond the butt fusion with the optical fiber connector tail fiber in the metal armour pipe 6. The fixing mode of each optical fiber connector 8 and the beam splitter 7 adopts glass bead welding or high-temperature glue bonding.
In the embodiment, the metal shell 1, the sealing plug 4, the connector 5, the metal armor tube 6 and the beam splitter 7 are fixed in a sealing manner by metal welding, threaded connection or high-temperature glue bonding.
The utility model discloses a manufacturing process mainly includes following step:
(1) firstly, leading out the tail fiber of the optical fiber connector 8 from the single-hole end of the beam splitter 7 to realize the separation of physical space, and bonding and fixing the tail fiber 8 of the optical fiber connector and the mounting hole of the multi-hole end of the beam splitter 7 by adopting structural adhesive;
(2) splicing the tail fibers at the single-hole end of the beam splitter 7 with the optical fibers and the tail fibers of the optical fiber temperature measurement sensing elements 3 one by using an optical fiber fusion splicer, and recoating and protecting a fusion splicing area;
(3) penetrating the tail fiber at the single-hole end of the beam splitter 7 into a metal armor pipe 6, protecting the tail fiber and a welding area, sleeving a connector 5, bonding and fixing the metal armor pipe 6 with the mounting hole at the single-hole end of the beam splitter 7 and the armor pipe mounting hole of the connector 5 by high-temperature glue, and finally inserting a carbon rod 2 into the carbon rod mounting hole of the connector 5 and bonding and fixing by the high-temperature glue;
(4) measuring the length from the temperature measuring end head of the optical fiber and the optical fiber temperature measuring sensitive element 3 to the connector 5 by using a graduated scale, cutting the carbon rod 2 by the length, embedding the optical fiber and the optical fiber temperature measuring sensitive element 3 into the trapezoidal groove on the outer wall of the carbon rod 2, and keeping the optical fiber in a loose state without obvious bending;
(5) fixing the metal shell 1 on a scale platform, then penetrating a carbon rod 2 into the scale platform, marking the relative position of a temperature measuring point on the metal shell 1 by taking the connector 5 as a datum point, and finally fixing the sealing plug 4 and the metal shell 1 by adopting metal welding, threaded connection, high-temperature glue bonding and other modes to finish the manufacture of the optical fiber high-temperature sensor.
The utility model provides an optic fibre and optic fibre temperature measurement sensing element 3's that implant quantity can carry out abundant implantation according to carbon-point 2's fluting quantity in carbon-point 2, can be 2 cores or 4 cores or 8 cores. Meanwhile, the number of the mounting holes at the porous end of the beam splitter 7 is equal to or more than the number of the optical fibers and the optical fiber temperature measurement sensing elements 3. The temperature measurement precision and the temperature measurement range of the optical fibers and the optical fiber temperature measurement sensing elements 3 implanted in the carbon rod 2 can be designed as required, and the number and the positions of the temperature sensing elements on each optical fiber can be designed and arranged randomly as required, so that the optical fibers and the optical fiber temperature measurement sensing elements are not limited to one-to-one cross correspondence and can be combined randomly.
To sum up, the utility model has enumerated an embodiment, but this is not only limited to above-mentioned embodiment, as long as reach with any the same or similar means the technical effect of the utility model, all should belong to the scope of the protection of the utility model.
Claims (7)
1. The utility model provides a multicore multi-measuring point optic fibre high temperature sensor structure of anti-crosstalk which characterized in that: the multi-core multi-measuring-point optical fiber high-temperature sensor structure comprises a hollow metal shell (1) with openings at two ends, a carbon rod (2), a metal armor tube (6), a beam splitter (7), at least two optical fibers, an optical fiber temperature measuring sensitive element (3) and at least two optical fiber connectors (8); the outer surface of the carbon rod (2) is provided with at least two grooves (2-1) along the length direction of the carbon rod, at least two optical fibers and optical fiber temperature measurement sensitive elements (3) are respectively embedded into the grooves (2-1) of the carbon rod (2), the carbon rod (2) embedded with the optical fibers and the optical fiber temperature measurement sensitive elements (3) is arranged in a hollow metal shell (1), two ports of the metal shell (1) are sealed through a sealing plug (4) and a connector (5), and optical fiber holes are correspondingly formed in the connector (5); two ends of the metal armor pipe (6) are respectively fixedly connected with the connector (5) and the beam splitter (7), and the tail fibers of the at least two optical fibers and the optical fiber temperature measurement sensing element (3) penetrate through the optical fiber holes in the connector (5) to be arranged in the metal armor pipe (6) and are correspondingly welded with the tail fibers of the optical fiber connectors led into the metal armor pipe (6) through the beam splitter (7).
2. The structure of claim 1, wherein the structure of the crosstalk-proof multi-core multi-measuring-point optical fiber high-temperature sensor comprises: the optical fiber and the optical fiber in the optical fiber temperature measuring sensitive element (3) adopt any one of quartz optical fiber, sapphire optical fiber, YAG crystal optical fiber and photonic crystal optical fiber; the optical fiber temperature measurement sensitive element adopts a micro-nano processing structure of any one of an optical fiber grating, an F-P cavity and an MZ cavity engraved by an excimer laser or a femtosecond laser.
3. The structure of claim 1, wherein the structure of the crosstalk-proof multi-core multi-measuring-point optical fiber high-temperature sensor comprises: the carbon rod (2) is a cylindrical carbon rod of a carbon arc gouging machine, the diameter and the length of the carbon rod are matched with those of the metal shell (1), and 2-8 grooves (2-1) with inverted isosceles trapezoid cross sections are formed in the outer surface of the carbon rod (2); the optical fiber and the optical fiber temperature measurement sensitive element (3) are embedded into the inverted isosceles trapezoid groove (2-1) of the carbon rod, and the optical fiber is kept in a loose state without obvious bending.
4. The structure of claim 1, wherein the structure of the crosstalk-proof multi-core multi-measuring-point optical fiber high-temperature sensor comprises: the optical fiber bundle physical space separation device is characterized in that the beam splitter (7) is an optical fiber bundle physical space separation component which is divided into two or four or eight, the metal armor tube (6) is fixedly connected with a single-hole end of the beam splitter (7), at least two optical fiber connectors (8) are respectively connected with a multi-hole end of the beam splitter (7), tail fibers of each optical fiber connector (8) are led out from the multi-hole end of the beam splitter (7) and led out from the single-hole end, and the fixing mode of each optical fiber connector (8) and the beam splitter (7) is glass bead welding or high-temperature glue bonding.
5. The structure of claim 1, wherein the structure of the crosstalk-proof multi-core multi-measuring-point optical fiber high-temperature sensor comprises: the metal shell (1), the sealing plug (4), the connector (5), the metal armor tube (6) and the beam splitter (7) are fixedly sealed by metal welding, threaded connection or high-temperature glue bonding.
6. The structure of claim 1, wherein the structure of the crosstalk-proof multi-core multi-measuring-point optical fiber high-temperature sensor comprises: the metal shell adopts a stainless steel pipe, a copper pipe, a nickel alloy pipe or a Kovar alloy pipe.
7. The structure of claim 1, wherein the structure of the crosstalk-proof multi-core multi-measuring-point optical fiber high-temperature sensor comprises: the optical fiber connectors (8) are various optical fiber connectors of SC, ST and FC types according with the optical fiber connection standard.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112526000A (en) * | 2020-12-15 | 2021-03-19 | 北京北方车辆集团有限公司 | Optical fiber ring acoustic emission sensor and packaging method |
| CN114077011A (en) * | 2020-08-19 | 2022-02-22 | 宝山钢铁股份有限公司 | Continuous casting crystallizer temperature measurement optical fiber and manufacturing method thereof |
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2019
- 2019-11-13 CN CN201921959760.XU patent/CN210664815U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114077011A (en) * | 2020-08-19 | 2022-02-22 | 宝山钢铁股份有限公司 | Continuous casting crystallizer temperature measurement optical fiber and manufacturing method thereof |
| CN114077011B (en) * | 2020-08-19 | 2024-06-04 | 宝山钢铁股份有限公司 | Continuous casting crystallizer temperature measuring optical fiber and manufacturing method thereof |
| CN112526000A (en) * | 2020-12-15 | 2021-03-19 | 北京北方车辆集团有限公司 | Optical fiber ring acoustic emission sensor and packaging method |
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