CN102288325A - Optical fiber temperature sensor - Google Patents
Optical fiber temperature sensor Download PDFInfo
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- CN102288325A CN102288325A CN2011101196006A CN201110119600A CN102288325A CN 102288325 A CN102288325 A CN 102288325A CN 2011101196006 A CN2011101196006 A CN 2011101196006A CN 201110119600 A CN201110119600 A CN 201110119600A CN 102288325 A CN102288325 A CN 102288325A
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Abstract
The invention discloses an optical fiber temperature sensor, which belongs to the technical field of optical fiber sensing and comprises an optical transceiver module, a transmission optical fiber and a sensing head, wherein the transmission optical fiber is used for optical transmission between the optical transceiver module and the sensing head, the sensing head comprises a temperature sensing element, an optical fiber reflecting mirror and a polarizer, the temperature sensing element is a first-section polarization maintaining optical fiber, the transmission optical fiber is a single-mold optical fiber, one end of the polarizer is connected with the transmission optical fiber, the other end of the polarizer is connected with the temperature sensing element through a second-section polarization maintaining optical fiber, a polarization shaft of the first-section polarization maintaining optical fiber and a polarization shaft of the second-section polarization maintaining optical fiber are in 45-degree fusion connection, and the other end of the first-section polarization maintaining optical fiber is provided with the optical fiber reflecting mirror. The optical fiber temperature sensor has the advantages that the principle and the structure are simple, the cost is low, the manufacture is easy, the sensitivity is adjustable, and the application demands of various different temperature ranges can be met.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, be specifically related to a kind of novel fibre optic temperature sensor.
Background technology
Fibre optic temperature sensor has very wide range of application.Its adopts optical fiber to make light path, and probe is separated with instrument, has increased adaptive capacity to environment, and it can be in strong electromagnetic, high voltage and can not use lead-in wire to carry out measuring under the condition such as electrical transmission.At present, the sensor of having succeeded in developing mainly contains fluorescent optical sensor, birefringece crystal sensor and semiconductor transducer.Existing fibre optic temperature sensor is mostly based on spectrophotometry, as list of references [1] Fiber Bragg Grating Temperature Sensor with Controllable Sensitivity; Jaehoon Jung, Hui Nam, Byoungho Lee, Jae Oh Byun, and Nam Seong Kim; Applied Optics, Vol.38, Issue13, the fiber grating of mentioning among the pp.2752-2754.List of references [2] Fabry-Perot Fiber-Optic Temperature Sensor; Lewis Research Center, Cleveland, Ohio NASA, Tech Briefs; Friday, the optical fiber Fabry one Perot etalon tool of mentioning among the January 01 1999.List of references [3] is based on the fibre optic temperature sensor of spectral detection; Optical fiber temperature sensor applying spectral analysis detection; " sensor technology " calendar year 2001 the 20th is rolled up the semiconductor absorption sensor of mentioning in the o. 11th, and they all require spectral analysis, complex manufacturing technology, and price is high.
Summary of the invention
The present invention is for existing temp sensor device complexity, problem with high costs, a kind of novel optical fiber temperature sensor that provides are provided.This sensor device is simple, the measuring accuracy height, makes easily, cost is low,, and adapt to temperature detection at high voltage and highfield environment.
The principle of described fibre optic temperature sensor is based on the temperature variant characteristic of double refractive inde of polarization maintaining optical fibre.The key element of sensor, temperature-sensing element is one section polarization maintaining optical fibre.It is poor that sensor is accurately measured the birefringent phase of this section polarization maintaining optical fibre, thereby obtain the information of temperature.
A kind of fibre optic temperature sensor provided by the invention comprises optical transceiver module, Transmission Fibers and sensing head; When described Transmission Fibers is polarization maintaining optical fibre, described sensing head comprises temperature-sensing element and fiber reflector, temperature-sensing element is one section polarization maintaining optical fibre, and first end of this section polarization maintaining optical fibre is provided with fiber reflector, is 45 degree between the polarization axle of second end and Transmission Fibers and fuses and be connected.Described optical transceiver module light source, optical fiber loop device, polarization beam apparatus and two photoelectric detectors, described optical fiber loop device and polarization beam apparatus are three port devices, wherein, two ports of the front end of optical fiber loop device connect the light source and first photoelectric detector respectively by single-mode fiber, the 3rd port of rear end connects first port of polarization beam apparatus front end by single-mode fiber, second port of polarization beam apparatus front end connects second photoelectric detector by single-mode fiber, and the 3rd port of rear end connects Transmission Fibers.Like this, two linear polarization light intensities that return in the Transmission Fibers are exactly the result that two linearly polarized lights in the temperature-sensing element are interfered.The output of two photoelectric detectors just provides the birefringent phase difference information of temperature-sensing element, the just information of the temperature that will survey.The method of the length of this section of temperature range available adjustment polarization maintaining optical fibre of measuring changes, thereby adapts to different application.
When described Transmission Fibers is single-mode fiber, a polarizer is installed on sensing head, the polarizer one end is connected with Transmission Fibers, be connected by polarization maintaining optical fibre between the other end and the temperature-sensing element, be 45 degree between the polarization axle of this section polarization maintaining optical fibre and polarization maintaining optical fibre that temperature-sensing element adopts and fuse and be connected.Described optical transceiver module mainly is made up of fiber coupler and two photoelectric detectors, described fiber coupler is four ports, wherein first port is used for directly receiving the light of light emitted, and second port connects Transmission Fibers, and all the other two ports connect two photoelectric detectors.
The invention has the advantages that:
1. the principle of fibre optic temperature sensor of the present invention and simple in structure is easy to make.
2. the sensitivity of fibre optic temperature sensor of the present invention is adjustable, only needs the length of the polarization maintaining optical fibre of change temperature-sensing element
Spend, just can satisfy the application demand of various temperature range.
3. the relative accuracy of temperature detection can reach 0.5%.
Description of drawings
Fig. 1 is the fibre optic temperature sensor principle schematic;
Fig. 2 is the typical sensor temperature response curve;
The optical fiber temperature transducer system principle schematic of Fig. 3 for simplifying.
Embodiment
Below in conjunction with accompanying drawing fibre optic temperature sensor provided by the invention is elaborated.The invention provides two embodiment and illustrate that the employing polarization maintaining optical fibre is as the formed temperature sensor of temperature-sensing element.
Embodiment 1:
Described fibre optic temperature sensor comprises optical transceiver module 1, Transmission Fibers 2 and is used to experience the sensing head 3 of measured point temperature a long way off, as shown in Figure 1, described optical transceiver module 1 is used for light is transferred to sensing head 3 by Transmission Fibers 2, sensing head 3 will comprise the intensity signal of temperature information by Transmission Fibers 2 back light transceiver modules 1, and then obtain the temperature information of measured point.Described Transmission Fibers 2 is polarization maintaining optical fibres.Described sensing head 3 comprises temperature-sensing element 301 and fiber reflector 302, and temperature-sensing element 301 is one section polarization maintaining optical fibre, and an end of temperature-sensing element 301 is provided with fiber reflector 302, and the other end connects Transmission Fibers 2.Described optical transceiver module 1 comprises light source 101, optical fiber loop device 102, polarization beam apparatus 103 and two photoelectric detector 104A, 104B, described optical fiber loop device 102 and polarization beam apparatus 103 are three port devices, wherein, the first port A of the front end of optical fiber loop device 102 is connected the light source 101 and the first photoelectric detector 104A with the second port B by single-mode fiber, the 3rd port C connects the first port A of polarization beam apparatus 103 front ends by single-mode fiber, the second port B of polarization beam apparatus 103 front ends connects the second photoelectric detector 104B by single-mode fiber, and the 3rd port C connects Transmission Fibers 2--polarization maintaining optical fibre.
The length of the polarization maintaining optical fibre that described temperature-sensing element 301 is used is by the temperature range decision of being surveyed.The general temperature range of detection that requires is big more, needs to select short polarization maintaining optical fibre as temperature-sensing element 301; The scope that require to detect hour then selects long polarization maintaining optical fibre as temperature-sensing element 301.
Fuse between the polarization maintaining optical fibre that polarization maintaining optical fibre that above-mentioned Transmission Fibers 2 is adopted and temperature-sensing element 301 are adopted, fuse a polarization axle of locating two sections polarization maintaining optical fibres mutually in angle of 45 degrees.
The trend of the light in the fibre optic temperature sensor of the present invention is: referring to Fig. 1, the light that light source 101 sends enters polarization beam apparatus 103 after by optical fiber loop device 102.The light of polarization beam apparatus 103 outputs is single linearly polarized light, and propagates along a polarization axle of Transmission Fibers 2.When entering temperature-sensing element 301, this linearly polarized light be broken down into+/-45 the degree directions two linearly polarized lights.They are propagated along two polarization axles of temperature-sensing element 301 respectively, are reflected along the original optical path backspace by fiber reflector 302 then.When entering Transmission Fibers 2 again, two linearly polarized lights in the temperature-sensing element 301 are got back on two polarization axles of Transmission Fibers 2 by+/-45 ° of projections respectively.The two linearly polarized light components that temperature-sensing element 301 is all arranged on each polarization axle of Transmission Fibers 2, their phase differential be respectively 2 δ with 2 δ+180 °.Wherein δ is that the one way birefringent phase of temperature-sensing element 301 is poor.Like this, the light intensity on each polarization axle is exactly the result of interference of two linearly polarized lights in the temperature-sensing element in Transmission Fibers 2.In backhaul, two linearly polarized lights in the Transmission Fibers 2 are polarized beam splitter 103 respectively and optical fiber loop device 102 is directed to photoelectric detector 104A and 104B, and two photoelectric detector 104A and 104B detect the intensity signal of two linearly polarized lights respectively.Because the birefringent phase difference of temperature-sensing element 301 is functions of temperature, so temperature can be by the reading D of two photoelectric detectors
1And D
2, determine with following formula:
Fig. 2 is the curve of a typical function F (T), according to two reading D
1And D
2, calculate functional value F, just can get temperature value T from the function curve F (T) of prior calibration.
Embodiment 2:
Based on principle similarly to Example 1, the embodiment of available another simplification.
In embodiment 1, the photoelectric detector 104A of two passages and the reading of 104B have all comprised the information of temperature, thereby can be reduced to and only use single passage.Like this, available single-mode fiber replaces twin-channel polarization maintaining optical fibre as Transmission Fibers 2.Simultaneously, the polarizer 303 of available two-port replaces the polarization beam apparatus 103 of three ports.For the variation that makes luminous power does not influence the work of system, we still use two photoelectric detectors, and replace optical fiber loop devices 102 with the fiber coupler 105 of four ports.As shown in Figure 3, the fibre optic temperature sensor that provides in the present embodiment 2 comprises optical transceiver module 1, Transmission Fibers 2 and sensing head 3, described Transmission Fibers 2 is a single-mode fiber, and the two ends of Transmission Fibers 2 connect the polarizer 303 in fiber coupler 105 and the sensing head 3 in the optical transceiver module 1 respectively; Described sensing head 3 is made up of temperature-sensing element 301, fiber reflector 302 and the polarizer 303, described temperature-sensing element 301 is one section polarization maintaining optical fibre, wherein temperature-sensing element 301 is provided with fiber reflector 302 foremost, the rear end of temperature-sensing element 301 is connected with the polarizer 303 by polarization maintaining optical fibre, and described temperature-sensing element 301 is connected with this section polarization maintaining optical fibre fuses a place, and the polarization axle of two sections polarization maintaining optical fibres is mutually 45 degree.
Described optical transceiver module 1 comprises light source 101, fiber coupler 105 and two photoelectric detector 106A and 106B, between fiber coupler 105 and the light source 101, be connected by monofilm optical fiber between fiber coupler 105 and the polarizer 303, described fiber coupler 105 is four port devices, wherein first port A is used to receive the light of light emitted, second port B connects Transmission Fibers, and all the other two port C are connected photoelectric detector 106A and 106B with D.One of them photoelectric detector 106A is used to detect the polarization state light intensity D that single-mode fiber returns
3, another photoelectric detector 106B is used for the detection light source 101 light intensity D that sends
4, prison shows the variation of luminous power, then according to formula:
Calculate F (T), just can get temperature value T from the function curve F (T) of prior calibration.D in the formula
3And D
4The reading of two photoelectric detectors of difference.
Because replaced transmission polarization maintaining optical fibre, polarization beam apparatus and optical fiber loop device respectively with single-mode fiber, the polarizer and fiber coupler among the embodiment 2, the cost of gained fibre optic temperature sensor reduces greatly.To the available this embodiment of the lower application of accuracy requirement.
Claims (3)
1. a fibre optic temperature sensor is characterized in that: comprise optical transceiver module, Transmission Fibers and sensing head; Described Transmission Fibers is used for the light transmission between optical transceiver module and the sensing head; Described sensing head comprises temperature-sensing element, fiber reflector and the polarizer, and temperature-sensing element is first section polarization maintaining optical fibre, and Transmission Fibers is a single-mode fiber; The polarizer one end is connected with Transmission Fibers, be connected by second section polarization maintaining optical fibre between the other end and the temperature-sensing element, be 45 degree between the polarization axle of second section polarization maintaining optical fibre and first section polarization maintaining optical fibre and fuse and be connected, the other end of the first end polarization maintaining optical fibre is provided with fiber reflector.
2. a kind of fibre optic temperature sensor according to claim 1, it is characterized in that: described optical transceiver module mainly is made up of fiber coupler and two photoelectric detectors, described fiber coupler is four ports, wherein first port is used for directly receiving the light of light emitted, second port connects Transmission Fibers, and all the other two ports connect two photoelectric detectors.
3. a kind of fibre optic temperature sensor according to claim 1 is characterized in that: in the described photoelectric detector, a photoelectric detector is used to detect the polarization state light intensity D that single-mode fiber returns
3, another photoelectric detector is used for detection light source and sends light intensity D
4, and monitor the variation of luminous power simultaneously, then according to formula:
Calculate the temperature T of required detection, D in the formula
3And D
4The reading of two photoelectric detectors of difference.
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| CN2011101196006A CN102288325B (en) | 2009-12-01 | 2009-12-01 | Optical fiber temperature sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203226A (en) * | 2015-09-09 | 2015-12-30 | 姚胜利 | Optical fiber temperature sensor |
| CN108088584A (en) * | 2017-12-29 | 2018-05-29 | 长园深瑞继保自动化有限公司 | Reflection-type optical fiber temperature sensor and preparation method thereof |
| CN108254101A (en) * | 2018-03-26 | 2018-07-06 | 南京曦光信息科技有限公司 | A kind of polarization interference formula passive fiber temperature sensor |
| CN108577964A (en) * | 2018-04-25 | 2018-09-28 | 南京市口腔医院 | Semiconductor laser therapeutic instrument, control method and temperature signal processing method |
| CN112710248A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Reflective birefringence interference strain sensor based on fully polarization-maintaining optical fiber |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW327676B (en) * | 1996-08-13 | 1998-03-01 | Nat Science Council | Optical frequency and temperature sensor and its application employs two different optical resonators to detect the temperature and frequency simultaneously that can be able to provide tunable and highly stabilized optical source for optical system application |
| CN100338449C (en) * | 2005-06-08 | 2007-09-19 | 北京航空航天大学 | Temperature sensor of polarization-preserving fiber in reflection type |
| CN1330949C (en) * | 2005-07-28 | 2007-08-08 | 北京航空航天大学 | Multi-channel optical fiber temperature sensor |
| WO2009107839A1 (en) * | 2008-02-29 | 2009-09-03 | 株式会社フジクラ | Physical quantity measuring device of optical frequency range reflection measuring type, and temperature and strain simultaneous measuring method using the device |
| CN100587427C (en) * | 2008-09-24 | 2010-02-03 | 北京航空航天大学 | Optical fiber temperature sensor based on wave length demodulation |
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2009
- 2009-12-01 CN CN2011101196006A patent/CN102288325B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203226A (en) * | 2015-09-09 | 2015-12-30 | 姚胜利 | Optical fiber temperature sensor |
| CN105203226B (en) * | 2015-09-09 | 2019-03-05 | 飞秒光电科技(西安)有限公司 | A kind of fibre optic temperature sensor |
| CN108088584A (en) * | 2017-12-29 | 2018-05-29 | 长园深瑞继保自动化有限公司 | Reflection-type optical fiber temperature sensor and preparation method thereof |
| CN108254101A (en) * | 2018-03-26 | 2018-07-06 | 南京曦光信息科技有限公司 | A kind of polarization interference formula passive fiber temperature sensor |
| CN108577964A (en) * | 2018-04-25 | 2018-09-28 | 南京市口腔医院 | Semiconductor laser therapeutic instrument, control method and temperature signal processing method |
| CN112710248A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Reflective birefringence interference strain sensor based on fully polarization-maintaining optical fiber |
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Address after: 100052 Beijing Xuan street zhuangshuyuan District No. 18 Building No. 6 Applicant after: Beijing Qired Power Technology Co., Ltd. Co-applicant after: Zibo Qired Photoelectric Technology Co., Ltd. Address before: 100052 Beijing city Xuanwu District Xuan street zhuangshuyuan District No. 18 Building No. 6 Applicant before: Beijing Qired Power Technology Co., Ltd. Co-applicant before: Zibo Qired Photoelectric Technology Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: BEIJING QIRUIDE ELECTRIC POWER TECHNOLOGY CO., LTD. TO: BEIJING QIRUIDE OPTOELECTRONIC TECHNOLOGY CO., LTD. |
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