基于Sagnac干涉计谐波游标效应的光纤温度传感器  

Fiber Optic Temperature Sensor Based on Harmonic Vernier Effect of Sagnac Interferometer

作　　者：杨玉强 张钰颖 李雨婷 高佳乐 牟小光[4] 毕磊 YANG Yuqiang;ZHANG Yuying;LI Yuting;GAO Jiale;MU Xiaoguang;BI Lei(Shenzhen Institute,Guangdong Ocean University,Shenzhen 518120,China;Guangdong Provincial Key Laboratory of Intelligent Equipment for South China Sea Marine Ranching,Guangdong Ocean University,Zhanjiang 524088,China;Research Center of Guangdong Smart Oceans Sensor Networks and Equipment Engineering,Guangdong Ocean University,Zhanjiang 524088,China;College of Mechanical Engineering,Guangdong Ocean University,Zhanjiang 524088,China;College of Continuing Education,Guangdong Ocean University,Zhanjiang 524088,China)

机构地区：[1]广东海洋大学深圳研究院,深圳518120 [2]广东海洋大学广东省南海海洋牧场智能装备重点实验室,湛江524088 [3]广东海洋大学智慧海洋传感网及其装备工程技术研究中心,湛江524088 [4]广东海洋大学机械工程学院,湛江524088 [5]广东海洋大学继续教育学院,湛江524088

出　　处：《光子学报》2024年第4期120-129,共10页Acta Photonica Sinica

基　　金：广东省自然科学基金面上项目(Nos.2023A1515011212,2022A1515011603);深圳市基础研究面上项目(Nos.JCYJ20210324122813036,JCYJ20220530162200001);广东省普通高校重点领域专项(No.2021ZDZX1015);广东海洋大学科研启动经费资助项目(No.060302112009)。

摘　　要：提出一种基于双萨格奈克(Sagnac)干涉计谐波游标效应的光纤温度传感器,在该传感器中,传感干涉计中熊猫光纤的长度约为参考干涉计中熊猫光纤的整数倍。理论分析与实验结果表明,当游标放大倍率相同时,基于谐波游标效应和基于普通光学游标效应的双Sagnac干涉计具有相同的温度灵敏度,但谐波游标效应对应的熊猫光纤长度失谐量明显大于普通光学游标效应,且阶数越高对应的失谐量越大。由于失谐量越大,游标放大倍率越容易控制和实现,因此,从制备角度上讲,谐波游标效应明显优于普通光学游标效应。该研究可为后续光学游标效应的研究提供重要参考。Fiber optic interferometer has the advantages of small size,light weight,anti-corrosion,anti-electromagnetic interference,high sensitivity,etc.,and is widely used in the measurement of temperature,humidity,magnetic field and other parameters.In recent years,researchers have dramatically improved the measurement sensitivity of interferometric fiber-optic sensors by cascading or paralleling two fiber-optic interferometers to produce an optical Vernier effect.When the free spectral ranges of the two fiber optic interferometers are close but not equal,the resulting Vernier effect is called the normal Vernier effect,when the free spectral range of one fiber optic interferometer is about an integer multiple of the other fiber optic interferometer,the resulting Vernier effect is called the harmonic Vernier effect.In this paper,a parallel optical fiber temperature sensor based on two Sagnac interferometers is proposed,where the interferometers SI1 and SI2 are connected to the two outputs of the fiber-optic coupler C3,where SI1 is a reference interferometer and SI2 is a sensing interferometer.When the length of the Panda fiber in the SI2 interferometer is approximately i+1 of the length of the Panda fiber in the SI1 interferometer(i is 1,2,3…)times,the two interferometers will produce an i-order harmonic Vernier effect.When i is 0,it produces an normal Vernier effect,at which time there will be a single envelope in the interference spectrum.When i is 1,it produces a first-order harmonic Vernier effect,at which time there will be a double envelope in the interference spectrum.When i is 2,it produces a second-order harmonic Vernier effect,at which time there will be a triple envelope in the interference spectrum.In other cases,the order is analogous.We have numerically simulated the theoretical analysis and the free spectral range of the interferometric spectrum of the length interferometer SI1 with a Panda fiber of 520 mm at constant temperature is 9.13 nm.The SI2 interferometers with lengths of 572 mm,953 mm,and 1430 mm

关 键 词：光纤传感器 Sagnac干涉计 谐波游标效应 普通游标效应 温度传感 

分 类 号：O436[机械工程—光学工程]