CN103471742A - Alcohol-filling-based high-sensitivity photonic crystal fiber temperature sensor - Google Patents
Alcohol-filling-based high-sensitivity photonic crystal fiber temperature sensor Download PDFInfo
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- CN103471742A CN103471742A CN2013104734090A CN201310473409A CN103471742A CN 103471742 A CN103471742 A CN 103471742A CN 2013104734090 A CN2013104734090 A CN 2013104734090A CN 201310473409 A CN201310473409 A CN 201310473409A CN 103471742 A CN103471742 A CN 103471742A
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Abstract
一种基于酒精灌注的高灵敏度光子晶体光纤温度传感器，主要解决现有光纤环境（FLM）干涉结构的温度传感器灵敏度低、抗外界干扰性差等问题。它由入射光纤(1)和接收光纤(2)、干涉臂A(3)和干涉臂B(4)、出射光纤A(5)和出射光纤B(6)、分束端2×2的3-dB耦合器(7)、合束端2×2的3-dB耦合器(8)、酒精灌注高双折射光子晶体光纤(9)、银反射镜(10)组成。上述分束端2×2的3-dB耦合器(7)、干涉臂A(3)和干涉臂B(4)和合束端2×2的3-dB耦合器(8)构成光纤环镜。本发明灵敏度高、抗外界电磁干扰能力强，可以应用于各类实际工程中。
A high-sensitivity photonic crystal fiber temperature sensor based on alcohol perfusion mainly solves the problems of low sensitivity and poor anti-interference of the temperature sensor in the existing fiber environment (FLM) interference structure. It consists of incident optical fiber (1) and receiving optical fiber (2), interference arm A (3) and interference arm B (4), outgoing optical fiber A (5) and outgoing optical fiber B (6), splitting end 2×2 3 -dB coupler (7), 3-dB coupler (8) with 2×2 beam combining ends, alcohol perfusion high birefringence photonic crystal fiber (9), and silver reflector (10). The 2×2 3-dB coupler (7) at the splitting end, the interference arm A (3) and the interference arm B (4) and the 2×2 3-dB coupler (8) at the beam combining end constitute a fiber optic loop mirror. The invention has high sensitivity and strong ability to resist external electromagnetic interference, and can be applied to various practical projects.
Description
Technical field
The present invention relates to a kind of high sensitivity temperature sensor based on high double-refraction photon crystal fiber ring mirror, particularly a kind of high-sensitivity photonic crystal fiber temperature sensor based on the alcohol perfusion, belong to technical field of optical fiber sensing.
Background technology
Fiber loop mirror (FLM) is widely used in optical fiber communication and sensor-based system.Two light waves that transmit in opposite direction in the fiber turns be coiled into by same optical fiber produce different phase shifts under the extraneous factor effect.Sensing, i.e. optical fibre gyro are rotated in its most typical application exactly.Because it does not have movable device, the degating region of laser gyro while there is no nonlinear effect and the slow-speed of revolution, thereby be hopeful very much to make the high-performance and low-cost device.By interference effect, being detected, is exactly the ultimate principle of sagnac interferometer.Fibre Optical Sensor based on sagnac interferometer has its obvious advantage in long distance, little leakage pipe detection on location, also can be applicable in the fiber fence warning system simultaneously, have simple efficient, install convenient, safeguard the advantages such as simple, that cost is lower.
19 beginnings of the century, Young has confirmed that with interference experiment light has undulatory property, famous Mechanical Study On Young Interference experiment that Here it is.After this people's various interfere measurement techniques that begin one's study, progressively formed a kind of highly sensitive measuring method.Along with the appearance of laser, can easily obtain high-intensity coherent source, thereby make this measuring technique obtain swift and violent development and application.And the appearance of optical fiber makes the light in interferometer to propagate in the flexible low-loss optically waveguide of softness, and needn't be at spatial.And use the device of full optical fiber, can make interferometer do very compactly, saved loaded down with trivial details adjustment process.Light all is enclosed in fibre system, makes interferometer become reliable and stable, also greatly reduce the noise that external interference is introduced, make the sensitivity of interferometer measurement obtain increasing substantially.More famous interferometer has Michelson (Michelson) interferometer, Mach-Dare (Mach-Zehnder) interferometer, Sagnac (Sagnac) interferometer and Fabry-Perot (Febry-Perot) interferometer etc.
But FLM constructive interference instrument technology still exists some critical problems, the most importantly stabilization technique of the pattern in interferometer and polarization problem and interferometer in temperature survey.Because there is birefringence in optical fiber, when light transmits in optical fiber, can change the polarisation of light state, and the variation of polarization state is with the variation of some factors such as environment temperature.When interferometer is subject to the impact of external environment, it interferes output to there will be random fluctuation, the simultaneously sensitivity of conventional interference structure is also some limitation in actual applications, so the existing interferometer anti-interference of environment to external world is poor, high sensitivity is difficult to realization, thereby greatly reduces the practicality of FLM constructive interference instrument.
In research in sum, prior art can't solve the problem that FLM constructive interference instrument temperature control is low and anti-external interference is poor, thereby greatly reduces the practicality of interferometer, has limited the application of interferometer in Practical Project.
Summary of the invention
The present invention is directed to the problems such as existing low, the anti-external interference poor performance of FLM interference structure temperature sensor sensitivity, high, the anti-external interference of a kind of temperature control, easy-operating alcohol perfusion high double-refraction photon crystal fiber ring mirror interferometer simple in structure are provided.
High double-refraction photon crystal fiber is a kind of novel optical fiber and possesses good optical characteristics, in its covering, distributing periodic arrangement radially, along fiber axis to the airport stretched, can design the PCF(photonic crystal fiber with various Their Exotic Properties by size, shape, the position distribution of flexible change airport).Arrange asymmetric pore and can produce the high birefringence effect.Because high double-refraction photon crystal fiber has the airport of periodic arrangement, pour into therein the alcohol of high thermal expansion coefficient, when the alcohol expanded by heating, the double refractive inde of high double-refraction photon crystal fiber is changed flexibly.
The objective of the invention is to be achieved through the following technical solutions:
A kind of high-sensitivity photonic crystal fiber temperature sensor based on alcohol perfusion, comprise incident optical (1) and receive optical fiber (2), interfere arm A (3) and interference arm B (4), outgoing optical fiber A (5) and outgoing optical fiber B (6), the 3-dB coupling mechanism (7) of beam splitting end 2 * 2.
Described a kind of high-sensitivity photonic crystal fiber temperature sensor based on the alcohol perfusion also comprises 3-dB coupling mechanism (8), alcohol perfusion high double-refraction photon crystal fiber (9), the silver-colored catoptron (10) that closes bundle end 2 * 2.
The 3-dB coupling mechanism (7) of described beam splitting end 2 * 2 two ports on one side are connected with incident optical (1) and reception optical fiber (2) respectively, another two ports of the 3-dB coupling mechanism (7) of beam splitting end 2 * 2 are connected with interfering arm A (3) and interference arm B (4) respectively, 3-dB coupling mechanism (8) two ports on one side that close bundle end 2 * 2 are connected with interfering arm A (3) and interference arm B (4) respectively, another two ports of 3-dB coupling mechanism (8) that close bundle end 2 * 2 are connected with outgoing optical fiber B (6) with outgoing optical fiber A (5) respectively, outgoing optical fiber A (5) is connected with alcohol perfusion high double-refraction photon crystal fiber (9), alcohol perfusion high double-refraction photon crystal fiber (9) end silvered mirror (10), the 3-dB coupling mechanism (7) of beam splitting end 2 * 2, interfere arm A (3) and interfere arm B (4) and close bundle and hold 2 * 2 3-dB coupling mechanism (8) formation fiber loop mirror.
Described incident optical (1) and receive optical fiber (2), interfere arm A (3) and interference arm B (4), outgoing optical fiber A (5) and G.652 outgoing optical fiber B (6) all can adopt, single-mode fiber G.653 or G.655; Incident optical (1) and reception optical fiber (2) length are 20-40cm, and interfering arm A (3) and interfering arm B (4) length is 10-20cm, and the length of outgoing optical fiber A (5) and outgoing optical fiber B (6) is 20-40cm.
The 3-dB coupling mechanism (7) of described beam splitting end 2 * 2, the 3-dB coupling mechanism (8) that closes bundle end 2 * 2 are coupling fiber output type coupling mechanism, and service band is 1270-1610nm.Alcohol perfusion high double-refraction photon crystal fiber (9) adopts hollow band gap-photonic crystal fiber, and double refractive inde is 3.0 * 10-4-5.0 * 10-4.
Described silver-colored catoptron (10) adopts electrostatic self-assembled technique plated film to form, and thickness is 1.0nm-2.0nm.
Principle of work of the present invention is: incident light is divided into the light signal of two reverse transfer by the 3-dB coupling mechanism (7) of beam splitting end 2 * 2, and two-beam produces phase delay after reflecting through alcohol perfusion high double-refraction photon crystal fiber (9) and by silver-colored catoptron (10) through the FLM outgoing:
δ＝2πΔn
gL/λ
Δ n wherein
gfor the group velocity refringence, L is high double-refraction photon crystal fiber length, and λ is lambda1-wavelength.While coming back at the 3-dB of beam splitting end 2 * 2 coupling mechanism (7) after two-beam reflects through alcohol perfusion high double-refraction photon crystal fiber (9) and by silver-colored catoptron (10) through the FLM outgoing, interfere, emergent light is light and dark interference fringe.
The invention has the beneficial effects as follows: this temperature sensor utilizes the FLM structural design, and the periphery that high double-refraction photon crystal fiber is placed in FLM simultaneously is as sensing head, and the alcohol be poured into wherein has higher thermal expansivity.When the sensing head peripheral temperature changes, the expansion of alcohol can make the double refractive inde tool of high double-refraction photon crystal fiber have a greater change, and makes, through the optical path difference of FLM forward and reverse transmission light, larger change occurs, thereby can obtain high temperature sensitive.Simultaneously, the present invention is placed in sensing head outside FLM, and the structure of this uniqueness has just been eliminated because FLM optical fiber rotates the measuring error of introducing, and has improved greatly the interference free performance of this temperature sensor.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is high double-refraction photon crystal fiber end silvered mirror schematic diagram in the present invention.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail.
Referring to accompanying drawing 1, a kind of high-sensitivity photonic crystal fiber temperature sensor based on alcohol perfusion, by incident optical 1 with receive optical fiber 2, interfere arm A3 and interfere arm B4, outgoing optical fiber A5 and outgoing optical fiber B6, the 3-dB coupling mechanism 7 of beam splitting end 2 * 2, the 3-dB coupling mechanism 8 that closes bundle end 2 * 2, alcohol perfusion high double-refraction photon crystal fiber 9, silver-colored catoptron 10 form, 3-dB coupling mechanism 7 two ports on one side of beam splitting end 2 * 2 are connected with incident optical 1 and reception optical fiber 2 respectively, another two ports of the 3-dB coupling mechanism 7 of beam splitting end 2 * 2 are connected with interfering arm A3 and interference arm B4 respectively, closing 3-dB coupling mechanism 8 two ports on one side of restrainting end 2 * 2 is connected with interfering arm A3 and interference arm B4 connected two respectively, another two ports of 3-dB coupling mechanism 8 that close bundle end 2 * 2 are connected with outgoing optical fiber B6 with outgoing optical fiber A5 respectively, outgoing optical fiber A5 is connected with alcohol perfusion high double-refraction photon crystal fiber 9, alcohol perfusion high double-refraction photon crystal fiber 9 end silvered mirror 10, the 3-dB coupling mechanism 7 of beam splitting end 2 * 2, interfere arm A3 and the 3-dB coupling mechanism 8 of interfering arm B4 and closing bundle end 2 * 2 forms fiber loop mirrors.
Alcohol perfusion high double-refraction photon crystal fiber 9 in the present invention adopts hollow band gap-photonic crystal fiber, and double refractive inde is 3.49 * 10-4; Incident optical 1 and reception optical fiber 2, interference arm A3 and interference arm B4, outgoing optical fiber A5 and outgoing optical fiber B6 all can adopt G.652 single-mode fiber; Incident optical 1 and reception optical fiber 2 length are 25cm, and interfering arm A3 and interfering the length of arm B4 is 15cm, and the length of outgoing optical fiber A5 is 30cm, and the length of outgoing optical fiber B6 is 20cm; Silver catoptron 10 adopts electrostatic self-assembled technique plated film to form, and thickness is 1.5nm.Alcohol is poured into to the end that high double-refraction photon crystal fiber 9 is placed in outgoing optical fiber A5, alcohol perfusion high double-refraction photon crystal fiber 9 end silvered mirror 10.Again pass through FLM after by silver-colored catoptron 10 by the light of outgoing optical fiber A5 incident after alcohol perfusion high double-refraction photon crystal fiber 9, at the 3-dB of beam splitting end 2 * 2 coupling mechanism, 7 places interfere.Alcohol perfusion high double-refraction photon crystal fiber 9 is as sensing head, when the temperature change of its surrounding environment, the thermal expansivity of alcohol changes, and then change is being interfered arm A3 and the optical path difference of interfering arm B4 transmission light through FLM after silver-colored catoptron 10 reflections, thereby interference fringe is changed, and monitoring interference spectrum wavelength shift can be realized the measurement that alcohol perfusion high double-refraction photon crystal fiber 9 peripheral temperature change.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808341A (en) * | 2014-01-26 | 2014-05-21 | 沈阳师范大学 | Distributed microstructure optical fiber sensor |
| CN107830947A (en) * | 2017-10-20 | 2018-03-23 | 黑龙江工程学院 | A kind of spectrographic detection temperature sensor connected based on Sagnac rings with FP chambers |
| CN109084930A (en) * | 2018-10-29 | 2018-12-25 | 深圳大学 | A kind of hollow core photonic bandgap fiber interferometer sensor, producing device and method |
| WO2020087197A1 (en) * | 2018-10-29 | 2020-05-07 | 深圳大学 | Interferometric sensor employing hollow-core photonic bandgap fiber, and manufacturing device and method |
| CN113514164A (en) * | 2021-04-12 | 2021-10-19 | 武汉工程大学 | Michelson interferometric temperature sensor based on UV glue-filled suspended core fiber |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203587245U (en) * | 2013-10-11 | 2014-05-07 | 沈阳师范大学 | Alcohol-filling-based high-sensitivity photonic crystal fiber temperature sensor |
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| CN203587245U (en) * | 2013-10-11 | 2014-05-07 | 沈阳师范大学 | Alcohol-filling-based high-sensitivity photonic crystal fiber temperature sensor |
Non-Patent Citations (3)
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| YONG ZHAO等: "《Research on fiber optic temperature sensor using a novel high-birefringent fiber loop mirror with a reflection probe》", 《SENSORS AND ACTUATORS A: PHYSICAL》, 4 July 2012 (2012-07-04), pages 22 - 27 * |
| 伍铁生: "《液体填充的光子晶体光纤的传感特性研究》", 《中国优秀硕士学位论文全文数据库（电子期刊）》, no. 01, 15 January 2013 (2013-01-15) * |
| 史青: "《光子晶体光纤及其在传感领域的应用研究》", 《中国博士学位论文全文数据库（电子期刊）》, no. 07, 15 July 2011 (2011-07-15) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808341A (en) * | 2014-01-26 | 2014-05-21 | 沈阳师范大学 | Distributed microstructure optical fiber sensor |
| CN107830947A (en) * | 2017-10-20 | 2018-03-23 | 黑龙江工程学院 | A kind of spectrographic detection temperature sensor connected based on Sagnac rings with FP chambers |
| CN107830947B (en) * | 2017-10-20 | 2018-09-07 | 黑龙江工程学院 | One kind is based on Sagnac rings and the concatenated spectrographic detection temperature sensor of FP chambers |
| CN109084930A (en) * | 2018-10-29 | 2018-12-25 | 深圳大学 | A kind of hollow core photonic bandgap fiber interferometer sensor, producing device and method |
| WO2020087197A1 (en) * | 2018-10-29 | 2020-05-07 | 深圳大学 | Interferometric sensor employing hollow-core photonic bandgap fiber, and manufacturing device and method |
| CN109084930B (en) * | 2018-10-29 | 2023-12-22 | 深圳大学 | Hollow photonic band gap optical fiber interferometer sensor, manufacturing device and method |
| CN113514164A (en) * | 2021-04-12 | 2021-10-19 | 武汉工程大学 | Michelson interferometric temperature sensor based on UV glue-filled suspended core fiber |
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