CN201378085Y - Sensitizing fiber grating temperature sensor - Google Patents
Sensitizing fiber grating temperature sensor Download PDFInfo
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- CN201378085Y CN201378085Y CN200820220189U CN200820220189U CN201378085Y CN 201378085 Y CN201378085 Y CN 201378085Y CN 200820220189 U CN200820220189 U CN 200820220189U CN 200820220189 U CN200820220189 U CN 200820220189U CN 201378085 Y CN201378085 Y CN 201378085Y
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- fiber
- steel tube
- fiber grating
- metal capillary
- temperature sensor
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Abstract
The utility model discloses a sensitizing fiber grating temperature sensor, belonging to the technical filed of a sensor, relating to a sensitizing fiber grating temperature sensor with simple structure and high sensitivity. The utility model is characterized in that the fiber grating is sealed in a metal capillary tube by a prestressing force through adhering at the two ends; the metal capillary tube is embedded in an external-layer stainless steel tube, wherein the inner diameter of the external-layer stainless steel tube is more than the external diameter of the metal capillary tube; and then heat conducting silicon grease is filled between the metal capillary tube and the external layer stainless steel tube, at last, the two ends of the external layer stainless steel tube is connected with an optical fiber protective sleeve or an optical cable; during the manufacturing process, the tail fiber of the fiber grating is ensured to be in a bent state at the position of the external layer stainless steel tube. The utility model has the advantages of high temperature sensitivity, fast responding speed, simple structure, reasonable structure, high survival rate of the field installation, and the utility model can be applied to the high-precision temperature measurement under the condition of strong electromagnetic radiation, inflammable and explosive condition and the like.
Description
Technical field
The utility model belongs to sensor technical field, relates to a kind of fiber-optical grating temperature sensor of temperature sensitizing.
Background technology
The measurement of temperature is commonplace.The most frequently used is mercury thermometer, but can not realize the automatic record data of computing machine.The temperature sensor of electronic type is used more in all kinds of industrial control equipments and electronic instrument, and thermopair can be realized the measurement to high temperature, but measuring accuracy is not high, and needs cold junction compensation; Platinum resistance measuring accuracy height, but measurement sensitivity is lower, and need make compensation to the lead-in wire that connects; Thermistor is also commonly used does temperature element and temperature control device, highly sensitive, bigger non-linear but thermistor has, and long-time stability are relatively poor.Generally speaking, the temperature sensor of electronic type all exists and is vulnerable to electromagnetic interference, and the long-time stability of measurement are poor, can not realize shortcomings such as distant signal transmission.
Compare with traditional electronic temperature sensor, be not subjected to the influence of light source power fluctuation and optical fiber disturbance based on the fiber-optical grating temperature sensor of Wavelength-encoding, have that volume is little, measuring accuracy is high, anti-electromagnetic interference (EMI), long-time stability are good and the advantages such as long-distance transmissions that can realize signal, are thermometric best sensors under long-term temperature survey and the rugged surroundings.In addition, fiber-optical grating temperature sensor a plurality of sensors of can the mode by wavelength-division multiplex on an optical fiber, connecting, realization is to the quasi-distributed temperature survey of a plurality of points, so fiber-optical grating temperature sensor is many at measuring point, measurement space is narrow and small, need the long-term occasion of measuring to have remarkable advantages.In the application of reality, the fiber-optical grating temperature sensor of not doing any protection is subjected to the extruding of external force and shearing easily and destroys, on the other hand, also there is certain temperature one strain cross-sensitivity in fiber grating, must mask the variation of the fiber grating bragg wavelength that extraneous stress causes when carrying out accurate temperature measurement, the effective ways that solve above-mentioned two problems are that fiber-optical grating temperature sensor is encapsulated.
Summary of the invention
The purpose of this utility model provides a kind of fiber-optical grating temperature sensor of enhanced sensitivity, can realize that extraneous stress is isolated, and strengthens the sensitivity of fiber-optical grating temperature sensor.
The technical solution of the utility model is, fiber grating is encapsulated in a metal capillary by applying the gluing mode that connects of prestress and two-end-point, then metal capillary is inserted in the stainless-steel tube of internal diameter greater than the metal capillary external diameter, in order to increase the response speed of temperature, between the double layer of metal pipe, fill heat-conducting silicone grease.Connect optical fiber jacket or optical cable at the two ends of outer stainless-steel tube.The tail optical fiber of fiber grating is in case of bending in outer stainless-steel tube in the process of making.
Concrete manufacturing technology is: the overlay of both sides, fiber grating grid region certain-length is removed, expose bare fibre, and clean with acetone, afterwards fiber grating being inserted internal diameter is 0.5mm, external diameter is the metal capillary of 1mm, and apply constant pulling force in the both sides of fiber grating, and make about the reflection wavelength red shift 1nm of fiber grating, with metal-to-metal adhesive the two ends of metal capillary and the exposed part of optical fiber are cemented then.By applying the gluing method that combines that connects of prestress and two-end-point metal capillary and bare optical fibers and bare optical gratings are assembled together, can improve the temperature sensitivity of fiber-optic grating sensor, and simple to operate, the phenomenon of multimodal can not appear in the reliability height.The temperature sensor of above-mentioned enhanced sensitivity stress to external world is also responsive; in order to eliminate the cross-sensitivity of temperature and strain; the metal capillary that above-mentioned encapsulation is intact is inserted internal diameter 2mm; in the outer stainless-steel tube of external diameter 3mm; and between the double layer of metal pipe, fill heat-conducting silicone grease; connect optical fiber jacket or protection optical cable then at two ends, and cement with epoxide-resin glue.The tail optical fiber that needed to guarantee fiber grating before the filling heat-conducting silicone grease is in case of bending, to avoid the variation of outer layer metal tube distortion causing internal optical fiber grating strain.
The temperature transfer approach of the fiber-optical grating temperature sensor of process temperature sensitizing is: extraneous temperature-＞outer stainless-steel tube-＞heat-conducting silicone grease-＞the inner layer metal kapillary-＞fiber grating, therefore pouring into of heat-conducting silicone grease can be accelerated heat conducting speed, improves the response speed of fiber-optical grating temperature sensor.
Effect of the present utility model and benefit be, adopts the encapsulation technology of the fiber-optical grating temperature sensor of the enhanced sensitivity that the utility model proposes, and can improve the temperature sensitivity of fiber-optical grating temperature sensor by the big metal capillary of internal layer thermal expansivity; Can provide effective protection to fiber grating by outer stainless-steel tube; Can eliminate temperature-strain cross-sensitivity that extraneous ess-strain causes by inside and outside double layer of metal tubular construction; By the heat-conducting silicone grease between the inside and outside double layer of metal pipe, can improve the temperature-responsive speed of sensor.The temperature control height of the enhanced sensitivity fiber-optical grating temperature sensor that this encapsulation technology is made, response speed is fast, simple in structure, reasonable in design, the scene is mounted to the motility rate height, the high-precision temperature that can be used under strong electromagnetic radiation, the occasion such as inflammable and explosive is measured, and can by the multiplexing mode of connection in series-parallel realize multi-point temp in real time, telemeasurement.
Description of drawings
Accompanying drawing is the diagrammatic cross-section of the fiber-optical grating temperature sensor of enhanced sensitivity.
Among the figure: 1 fiber grating; 2 metal capillaries; 3 outer stainless-steel tubes; 4 heat-conducting silicone greases; 5 optical fiber; The tail optical fiber of 6 bendings; 7 optical fiber jackets.
Embodiment
Describe most preferred embodiment of the present utility model in detail below in conjunction with technical scheme and accompanying drawing.
The both sides, grid region of fiber grating 1 are respectively peelled off the overlay of 5mm, expose bare fibre, and clean with acetone, afterwards fiber grating 1 being inserted internal diameter is 0.5mm, external diameter is the metal capillary 2 of 1mm, and apply constant pulling force in the both sides of fiber grating 1, make about the reflection wavelength red shift 1nm of fiber grating 1, then with metal-to-metal adhesive with the two ends of metal capillary 2 and the exposed part secure bond of optical fiber.Above-mentioned metal capillary is inserted internal diameter 2mm, in the stainless-steel tube 3 of external diameter 3mm, fill heat-conducting silicone grease 4 then, two ends connect optical fiber jacket 7 backs and cement with epoxide-resin glue, the tail optical fiber 6 that needed to guarantee fiber grating before filling heat-conducting silicone grease 4 is in case of bending, to avoid the variation of outer layer metal tube distortion causing internal optical fiber grating strain.Metal capillary 2 among the embodiment can be the capillary stainless-steel tube, also can be bigger capillary aluminum pipe or capillary brass pipe of thermal expansivity.
Claims (1)
1. the fiber-optical grating temperature sensor of an enhanced sensitivity, it is characterized in that: fiber grating (1) is encapsulated in the metal capillary (2) by applying the gluing mode that connects of prestress and two-end-point, the above-mentioned metal capillary (2) that is packaged with fiber grating (1) is inserted in the outer stainless-steel tube (3) of internal diameter greater than metal capillary (2) external diameter, between metal capillary (2) and outer stainless-steel tube (3), fill heat-conducting silicone grease (4), connect optical fiber jacket (7) or optical cable at the two ends of outer stainless-steel tube (3); The tail optical fiber of fiber grating is in case of bending in outer stainless-steel tube (3) in the process of encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820220189U CN201378085Y (en) | 2008-11-29 | 2008-11-29 | Sensitizing fiber grating temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820220189U CN201378085Y (en) | 2008-11-29 | 2008-11-29 | Sensitizing fiber grating temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201378085Y true CN201378085Y (en) | 2010-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200820220189U Expired - Fee Related CN201378085Y (en) | 2008-11-29 | 2008-11-29 | Sensitizing fiber grating temperature sensor |
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| CN (1) | CN201378085Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148955A (en) * | 2013-01-31 | 2013-06-12 | 长飞光纤光缆有限公司 | Fiber bragg grating temperature sensor |
| CN103557959A (en) * | 2013-11-04 | 2014-02-05 | 国家电网公司 | Fiber grating temperature sensor probe |
| CN103674323A (en) * | 2013-12-25 | 2014-03-26 | 武汉理工大学 | Optical fiber grating temperature sensor for mine |
| CN104977098A (en) * | 2015-07-16 | 2015-10-14 | 吉林大学 | High-sensitivity fiber grating temperature sensor with fast response speed |
| CN104697663B (en) * | 2013-12-04 | 2017-08-25 | 深圳先进技术研究院 | Fiber temperature sensing system based on silicon substrate G T chambers |
| CN107290076A (en) * | 2017-07-13 | 2017-10-24 | 兰州大学 | A kind of fiber-optical grating temperature sensor of extreme environment multimetering |
| CN107796528A (en) * | 2017-09-29 | 2018-03-13 | 中山大学 | A kind of method for packing that can be eliminated distributed fiber grating and be influenceed by extraneous stress |
| CN109938831A (en) * | 2019-03-12 | 2019-06-28 | 南京航空航天大学 | A kind of tumor microwave ablation needle with optical fiber temperature-measurement function |
| CN109984734A (en) * | 2019-03-12 | 2019-07-09 | 南京航空航天大学 | A kind of multiple spot tumor thermotherapy thermometric needle based on fiber bragg grating |
| CN111811685A (en) * | 2020-07-22 | 2020-10-23 | 广州大学 | Fiber grating temperature sensor, assembly and manufacturing method |
| CN113503827A (en) * | 2021-06-09 | 2021-10-15 | 北京航天控制仪器研究所 | Device and method for measuring strain sensitivity of fiber bragg grating at ultralow temperature |
-
2008
- 2008-11-29 CN CN200820220189U patent/CN201378085Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148955A (en) * | 2013-01-31 | 2013-06-12 | 长飞光纤光缆有限公司 | Fiber bragg grating temperature sensor |
| CN103557959B (en) * | 2013-11-04 | 2015-06-24 | 国家电网公司 | Fiber grating temperature sensor probe |
| CN103557959A (en) * | 2013-11-04 | 2014-02-05 | 国家电网公司 | Fiber grating temperature sensor probe |
| CN104697663B (en) * | 2013-12-04 | 2017-08-25 | 深圳先进技术研究院 | Fiber temperature sensing system based on silicon substrate G T chambers |
| CN103674323B (en) * | 2013-12-25 | 2017-01-11 | 武汉理工大学 | Optical fiber grating temperature sensor for mine |
| CN103674323A (en) * | 2013-12-25 | 2014-03-26 | 武汉理工大学 | Optical fiber grating temperature sensor for mine |
| CN104977098A (en) * | 2015-07-16 | 2015-10-14 | 吉林大学 | High-sensitivity fiber grating temperature sensor with fast response speed |
| CN107290076A (en) * | 2017-07-13 | 2017-10-24 | 兰州大学 | A kind of fiber-optical grating temperature sensor of extreme environment multimetering |
| CN107290076B (en) * | 2017-07-13 | 2023-08-15 | 兰州大学 | Multi-point measuring fiber bragg grating temperature sensor in extreme environment |
| CN107796528A (en) * | 2017-09-29 | 2018-03-13 | 中山大学 | A kind of method for packing that can be eliminated distributed fiber grating and be influenceed by extraneous stress |
| CN109938831A (en) * | 2019-03-12 | 2019-06-28 | 南京航空航天大学 | A kind of tumor microwave ablation needle with optical fiber temperature-measurement function |
| CN109984734A (en) * | 2019-03-12 | 2019-07-09 | 南京航空航天大学 | A kind of multiple spot tumor thermotherapy thermometric needle based on fiber bragg grating |
| CN111811685A (en) * | 2020-07-22 | 2020-10-23 | 广州大学 | Fiber grating temperature sensor, assembly and manufacturing method |
| CN113503827A (en) * | 2021-06-09 | 2021-10-15 | 北京航天控制仪器研究所 | Device and method for measuring strain sensitivity of fiber bragg grating at ultralow temperature |
| CN113503827B (en) * | 2021-06-09 | 2023-03-07 | 北京航天控制仪器研究所 | Device and method for measuring strain sensitivity of fiber bragg grating at ultralow temperature |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20101129 |