CN103940530A - Temperature sensor based on hollow annular waveguide optical fiber - Google Patents
Temperature sensor based on hollow annular waveguide optical fiber Download PDFInfo
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- CN103940530A CN103940530A CN201410105273.2A CN201410105273A CN103940530A CN 103940530 A CN103940530 A CN 103940530A CN 201410105273 A CN201410105273 A CN 201410105273A CN 103940530 A CN103940530 A CN 103940530A
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- annular waveguide
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 67
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000001228 spectrum Methods 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 74
- 238000003466 welding Methods 0.000 claims description 10
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 239000004038 photonic crystal Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Abstract
The invention provides a temperature sensor based on a hollow annular waveguide optical fiber. One end of an optical fiber sensing head is connected with a light source through an input single-mode optical fiber, and the other end of the optical fiber sensing head is connected with an optical spectrum analyzer through an output single-mode optical fiber. The optical fiber sensing head is composed of a capillary tube, an optical fiber Mach-Zehnder interferometer packaged in the capillary tube and liquid with a high thermo-optical coefficient. The optical fiber Mach-Zehnder interferometer comprises an input multi-mode optical fiber, the hollow annular waveguide optical fiber and an output multi-mode optical fiber, wherein the input multi-mode optical fiber is fused with the input single-mode optical fiber in an axis alignment mode, the output multi-mode optical fiber is fused with the output single-mode optical fiber in an axis alignment mode, the hollow annular waveguide optical fiber is fused with the input multi-mode optical fiber and the output multi-mode optical fiber in an axis staggering mode, the staggering distance between the optical fiber axes is larger than the wall thickness of the hollow annular waveguide optical fiber, and air holes of the hollow annular waveguide optical fiber are filled with the liquid with the high thermo-optical coefficient. Through the air holes of the hollow annular waveguide optical fiber and two light beams transmitted by the annular waveguide, the temperature can be measured, and the temperature sensor is compact in structure and high in sensitivity.
Description
Technical field
The present invention relates to a kind of fibre optic temperature sensor, relate in particular to a kind of temperature sensor based on hollow annular waveguide fiber.
Background technology
Fibre optic temperature sensor because size is little, the advantage such as fast response time, anticorrosive, anti-electromagnetic interference (EMI) is widely studied, and had the Fibre Optical Sensor of multiple different structure for temperature survey.These structures mainly contain based on Fiber Bragg Grating FBG, long period fiber grating, Fabry-Perot interferometer, double-core photonic crystal fiber and various structure of interfering based on core mode-cladding mode.The sensitivity of the temperature sensor based on Fiber Bragg Grating FBG is lower, is about 0.01nm/ DEG C; The sensitivity of the remolding sensitivity optical fiber Bragg grating temperature sensor based on long period fiber grating and various temperature sensors of interfering based on core mode-cladding mode is slightly high, but is also generally about 0.1nm/ DEG C; Temperature sensor based on Fabry-Perot interferometer requires very high to the reflectivity at sensor fibre two ends; Temperature sensor based on double-core photonic crystal fiber requires photonic crystal fiber to carry out bending pre-service, has increased the instability of structure.
Summary of the invention
The object of the present invention is to provide a kind of compact conformation, the highly sensitive temperature sensor based on hollow annular waveguide fiber.
The object of the present invention is achieved like this:
Comprise wide spectrum light source, input single-mode fiber, optical fiber sensor head, output single-mode fiber and spectroanalysis instrument, one end of optical fiber sensor head is connected with light source by input single-mode fiber, the other end of optical fiber sensor head is connected with spectroanalysis instrument by output single-mode fiber, described optical fiber sensor head is by kapillary, be encapsulated in fiber Mach-Zehnder interferometer and high thermo-optical coeffecient liquid composition in kapillary, described fiber Mach-Zehnder interferometer comprises input multimode optical fiber, hollow annular waveguide fiber and output multimode optical fiber, input multimode optical fiber and input single-mode fiber are to axle welding, output multimode optical fiber and output single-mode fiber are to axle welding, the two ends of hollow annular waveguide fiber are greater than the wall thickness of described hollow annular waveguide fiber respectively at the distance staggering with input multimode optical fiber and the wrong axle welding of output multimode optical fiber and fiber axis, in the airport of hollow annular waveguide fiber, be full of high thermo-optical coeffecient liquid.
The present invention can also comprise:
1, described hollow annular waveguide fiber comprises and is positioned at the airport in axle center and the disc waveguide coaxial with airport, and airport diameter range is 60 μ m-100 μ m, and the external diameter of disc waveguide is 125 μ m.
2, described input multimode optical fiber and output multimode optical fiber are step-refraction index multimode optical fibers.
Beneficial effect of the present invention is:
(1) temperature sensor of the present invention, by by hollow annular waveguide fiber and input multimode optical fiber and the welding of output multimode optical fiber core shift, can fill up liquid the airport of hollow annular waveguide fiber easily.
(2) temperature sensor of the present invention, utilize the two-beam interference of transmitting in the airport of hollow annular waveguide fiber and disc waveguide to form fiber Mach-Zehnder interferometer, by fill high thermo-optical coeffecient liquid at the airport of hollow annular waveguide fiber, can greatly improve the temperature control of sensor.
(3) temperature sensor of the present invention, can not need kapillary encapsulation, and Mach-Zehnder interferometer part is directly put into testing liquid, makes testing liquid enter the airport of hollow annular waveguide fiber, realizes the temperature survey to testing liquid.
(4) temperature sensor of the present invention, can carry out cascade by the hollow annular waveguide fiber sensing head of different length, realizes the accurate distribution measuring of temperature.
Brief description of the drawings
Fig. 1 is the structural representation of the temperature sensor based on hollow annular waveguide fiber of the present invention.
Fig. 2 is optical fiber sensor head structural representation of the present invention.
Fig. 3 is a kind of end face structure schematic diagram of hollow annular waveguide fiber.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described for example, but should not limit the scope of the invention with this.
In conjunction with Fig. 1 and Fig. 2, a kind of temperature sensor based on hollow annular waveguide fiber of the present invention, comprises wide spectrum light source 1, input single-mode fiber 2, optical fiber sensor head 3, output single-mode fiber 4 and spectroanalysis instrument 5; One end of optical fiber sensor head 3 is connected with light source 1 by input single-mode fiber 2, and the other end is connected with spectroanalysis instrument 5 by output single-mode fiber 4; Optical fiber sensor head 3 is made up of kapillary 31, the fiber Mach-Zehnder interferometer 32 and the high thermo-optical coeffecient liquid 33 that are encapsulated in kapillary; Fiber Mach-Zehnder interferometer 32 is made up of input single-mode fiber 2, input multimode optical fiber 6, hollow annular waveguide fiber 7, output multimode optical fiber 8 and output single-mode fiber 4 cascade fusion weld, wherein inputting single-mode fiber 2 is to axle welding with input multimode optical fiber 6, output multimode optical fiber 8 is to axle welding with output single-mode fiber 4, hollow annular waveguide fiber 7 is wrong axle weldings with input multimode optical fiber 6 and output multimode optical fiber 8, and the distance that fiber axis staggers is greater than the wall thickness of hollow annular waveguide fiber 7.
In conjunction with Fig. 3, hollow annular waveguide fiber 7 comprises and is positioned at the airport 71 in axle center and the disc waveguide 72 coaxial with airport; Airport 71 diameter ranges are 80 μ m, and the external diameter of disc waveguide is 125 μ m.
High thermo-optical coeffecient liquid 33 is full of to the airport 71 of hollow annular waveguide fiber by the micropore between hollow annular waveguide fiber 7 and input multimode optical fiber 6 and output multimode optical fiber 8.
It is as follows that the present invention realizes thermometric principle:
The light that wide spectrum light source 1 sends enters input multimode optical fiber 3 through input single-mode fiber 2, and input multimode optical fiber 3 is coupled into incident light disc waveguide 72 and fills in the airport 71 of high thermo-optical coeffecient liquid 33.Two-beam transmits along empty disc waveguide 72 and pore 71 respectively, enters in output single-mode fiber 4 and interfere after output multimode optical fiber 8; Interference signal is detected by spectroanalysis instrument 5.Owing to being full of high thermo-optical coeffecient liquid 33 in airport, the variation of environment temperature can make the refractive index of high thermo-optical coeffecient liquid 33 and disc waveguide 72 that corresponding variation all occurs, thereby the optical path difference of the two-beam interfering is changed, cause that interference spectrum drifts about.By detecting the drift value of spectrum just can realize the measurement to temperature variation.Conventionally the thermo-optical coeffecient of the contour thermo-optical coeffecient liquid of alcohol is 10
-4magnitude, the thermo-optical coeffecient of the material (quartz) of disc waveguide is 10
-6magnitude, therefore temperature control of the present invention improves two orders of magnitude than traditional based on long period fiber grating or the method based on intermode interference in silica fibre.
Claims (3)
1. the temperature sensor based on hollow annular waveguide fiber, comprise wide spectrum light source, input single-mode fiber, optical fiber sensor head, output single-mode fiber and spectroanalysis instrument, it is characterized in that: one end of optical fiber sensor head is connected with light source by input single-mode fiber, the other end of optical fiber sensor head is connected with spectroanalysis instrument by output single-mode fiber, described optical fiber sensor head is by kapillary, be encapsulated in fiber Mach-Zehnder interferometer and high thermo-optical coeffecient liquid composition in kapillary, described fiber Mach-Zehnder interferometer comprises input multimode optical fiber, hollow annular waveguide fiber and output multimode optical fiber, input multimode optical fiber and input single-mode fiber are to axle welding, output multimode optical fiber and output single-mode fiber are to axle welding, the two ends of hollow annular waveguide fiber are greater than the wall thickness of described hollow annular waveguide fiber respectively at the distance staggering with input multimode optical fiber and the wrong axle welding of output multimode optical fiber and fiber axis, in the airport of hollow annular waveguide fiber, be full of high thermo-optical coeffecient liquid.
2. the temperature sensor based on hollow annular waveguide fiber according to claim 1, is characterized in that: described hollow annular waveguide fiber comprises and be positioned at the airport in axle center and the disc waveguide coaxial with airport, and airport diameter range is 60
μm-100 μ m, the external diameter of disc waveguide is 125 μ m.
3. the temperature sensor based on hollow annular waveguide fiber according to claim 1 and 2, is characterized in that: described input multimode optical fiber and output multimode optical fiber are step-refraction index multimode optical fibers.
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| CN201410105273.2A CN103940530B (en) | 2014-03-21 | 2014-03-21 | A kind of temperature sensor based on hollow annular waveguide fiber |
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| CN201410105273.2A CN103940530B (en) | 2014-03-21 | 2014-03-21 | A kind of temperature sensor based on hollow annular waveguide fiber |
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| CN103940530A true CN103940530A (en) | 2014-07-23 |
| CN103940530B CN103940530B (en) | 2016-05-04 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297208A (en) * | 2014-10-21 | 2015-01-21 | 天津理工大学 | Interferometric optical fiber sensor based on pohotonic crystal optical fiber |
| CN104897302A (en) * | 2015-06-19 | 2015-09-09 | 中国计量学院 | Temperature sensor of photonic crystal optical fiber Michelson interferometer based on corrosion processing |
| CN105181170A (en) * | 2015-04-30 | 2015-12-23 | 中国计量学院 | Mach-Zehnder interferometer temperature sensor based on corroded photonic crystal fibers |
| CN105424219A (en) * | 2015-12-08 | 2016-03-23 | 北京无线电计量测试研究所 | Optical fiber taper sensor based on Mach-Zehnder interferometer, and preparation method thereof |
| CN105458458A (en) * | 2015-12-22 | 2016-04-06 | 吉林大学 | Non-planar welded seam temperature field monitoring device and method based on abnormal-shaped infrared optical fiber bundles |
| CN106248248A (en) * | 2015-10-13 | 2016-12-21 | 北京信息科技大学 | A kind of thermometry based on thin-core fibers Mach-Zehnder interferometer |
| CN106644154A (en) * | 2016-09-12 | 2017-05-10 | 武汉工程大学 | Capillary structure-based optical fiber high-temperature sensor and preparation method thereof |
| CN107894292A (en) * | 2017-11-17 | 2018-04-10 | 中国计量大学 | Refractive index temperature double parameter measuring method and device based on optical fiber surface plasmon resonance body |
| CN108279079A (en) * | 2018-01-08 | 2018-07-13 | 东北大学 | A kind of point type temperature sensing device coating dimethyl silicone polymer based on coreless fiber radial direction serious mistake bit architecture |
| CN108332876A (en) * | 2018-01-30 | 2018-07-27 | 华中科技大学 | A kind of fibre optic temperature sensor |
| CN108362665A (en) * | 2018-03-23 | 2018-08-03 | 中国计量大学 | A kind of combination microstructured optical fibers and micro-fluidic acidometer |
| CN112327420A (en) * | 2020-11-03 | 2021-02-05 | 中航光电科技股份有限公司 | Waveguide through optical fiber alignment coupling transmission structure and production process |
| CN114136348A (en) * | 2021-11-15 | 2022-03-04 | 复旦大学 | Nano-pore fiber Bragg grating sensor and preparation method thereof |
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| CN101126666A (en) * | 2007-09-27 | 2008-02-20 | 天津大学 | High sensitivity optical fiber temperature sensor |
| CN102419221A (en) * | 2011-09-07 | 2012-04-18 | 南京大学 | Unpolarized interference high-sensitivity photonic crystal fiber temperature sensor and manufacturing method thereof |
| CN103439765A (en) * | 2013-06-26 | 2013-12-11 | 江苏金迪电子科技有限公司 | All-optical-fiber type multi-path interferometer |
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2014
- 2014-03-21 CN CN201410105273.2A patent/CN103940530B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101126666A (en) * | 2007-09-27 | 2008-02-20 | 天津大学 | High sensitivity optical fiber temperature sensor |
| CN102419221A (en) * | 2011-09-07 | 2012-04-18 | 南京大学 | Unpolarized interference high-sensitivity photonic crystal fiber temperature sensor and manufacturing method thereof |
| CN103439765A (en) * | 2013-06-26 | 2013-12-11 | 江苏金迪电子科技有限公司 | All-optical-fiber type multi-path interferometer |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297208A (en) * | 2014-10-21 | 2015-01-21 | 天津理工大学 | Interferometric optical fiber sensor based on pohotonic crystal optical fiber |
| CN105181170A (en) * | 2015-04-30 | 2015-12-23 | 中国计量学院 | Mach-Zehnder interferometer temperature sensor based on corroded photonic crystal fibers |
| CN105181170B (en) * | 2015-04-30 | 2018-10-26 | 中国计量学院 | A kind of temperature sensor of the photonic crystal fiber Mach-Zehnder interferometer based on corrosion treatment |
| CN104897302A (en) * | 2015-06-19 | 2015-09-09 | 中国计量学院 | Temperature sensor of photonic crystal optical fiber Michelson interferometer based on corrosion processing |
| CN106248248A (en) * | 2015-10-13 | 2016-12-21 | 北京信息科技大学 | A kind of thermometry based on thin-core fibers Mach-Zehnder interferometer |
| CN105424219B (en) * | 2015-12-08 | 2018-09-07 | 北京无线电计量测试研究所 | A kind of optical taper sensor and preparation method thereof based on Mach-Zehnder interferometers |
| CN105424219A (en) * | 2015-12-08 | 2016-03-23 | 北京无线电计量测试研究所 | Optical fiber taper sensor based on Mach-Zehnder interferometer, and preparation method thereof |
| CN105458458A (en) * | 2015-12-22 | 2016-04-06 | 吉林大学 | Non-planar welded seam temperature field monitoring device and method based on abnormal-shaped infrared optical fiber bundles |
| CN106644154A (en) * | 2016-09-12 | 2017-05-10 | 武汉工程大学 | Capillary structure-based optical fiber high-temperature sensor and preparation method thereof |
| CN107894292A (en) * | 2017-11-17 | 2018-04-10 | 中国计量大学 | Refractive index temperature double parameter measuring method and device based on optical fiber surface plasmon resonance body |
| CN107894292B (en) * | 2017-11-17 | 2023-12-29 | 中国计量大学 | Refractive index temperature double-parameter measurement method and device based on optical fiber surface plasmon resonance |
| CN108279079A (en) * | 2018-01-08 | 2018-07-13 | 东北大学 | A kind of point type temperature sensing device coating dimethyl silicone polymer based on coreless fiber radial direction serious mistake bit architecture |
| CN108332876A (en) * | 2018-01-30 | 2018-07-27 | 华中科技大学 | A kind of fibre optic temperature sensor |
| CN108362665A (en) * | 2018-03-23 | 2018-08-03 | 中国计量大学 | A kind of combination microstructured optical fibers and micro-fluidic acidometer |
| CN112327420A (en) * | 2020-11-03 | 2021-02-05 | 中航光电科技股份有限公司 | Waveguide through optical fiber alignment coupling transmission structure and production process |
| CN114136348A (en) * | 2021-11-15 | 2022-03-04 | 复旦大学 | Nano-pore fiber Bragg grating sensor and preparation method thereof |
| CN114136348B (en) * | 2021-11-15 | 2023-08-01 | 复旦大学 | Nanopore optical fiber Bragg grating sensor and preparation method thereof |
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| CN103940530B (en) | 2016-05-04 |
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