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一阶光学游标效应的全光纤温度传感器

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本文提出并制备了一种基于法布里-珀罗干涉计(FPI)和迈克尔逊干涉计(MI)并联的全光纤温度传感器,该传感器由单模光纤依次错位熔接一段悬浮芯光纤和一段单模光纤而成,熔接和切割形成的反射面构成了 FPI干涉计和MI干涉计,且MI干涉计的光程约为FPI干涉计光程的2倍(略大于2倍),从而,两干涉计产生了一阶谐波游标效应.实验结果表明,该传感器干涉谱中出现了具有明显一阶谐波游标效应特征的双包络,且随着温度的升高,干涉谱双包络逐渐红移,红移量远大于单个MI干涉计;在20℃～120 ℃的温度范围内,该传感器的温度灵敏度为208 pm/℃,约为单个MI干涉计的20.8倍,约为单个FPI干涉计的245倍;升降温实验以及同一温度多次测量实验均表明,该传感器具有良好的重复性和稳定性.该传感器在同一根光纤内实现了 FPI和MI并联,其传感头总长度仅约为584.4 μm,且为全光纤尖端结构,因此,特别适合于小空间环境高温检测.
All-fiber temperature sensor based on first-order optical Vernier effect
In this paper,a novel all-fiber temperature sensor based on Fabry-Perot interferometer(FPI)and Michelson interferometer(MI)is proposed and fabricated.The sensor is formed by sequentially fusion-splicing a single-mode fiber,a segment of suspended-core fiber(SCF),and another segment of single-mode fiber,with each connection having an offset.The reflecting surfaces formed by the fusion and cutting constitute the FPI and MI,and the optical path of MI is about 2 times(slightly more than 2 times)that of FPI,so the two interferometers produce the first-order harmonic vernier effect.The experimental results show that the double envelopes with obvious first-order harmonic Vernier effect appears in the interference spectrum of the sensor,and with the increase of temperature,the double envelopes of the interference spectrum gradually red-shifts,and the red-shift amount is much greater than that of a single MI.In the temperature range of 20℃～120 ℃,the temperature sensitivity of the sensor is 208 pm/℃,about 20.8 times that of a single MI,and about 245 times that of a single FPI.The temperature rising and falling experiments and multiple measurement experiments at the same temperature show that the sensor has good repeatability and stability.The sensor realizes the parallel connection of FPI and MI within the same optical fiber,with a total length of the sensor head being only about 584.4 μm.Additionally,it features an all-fiber tip structure,making it particularly suitable for high-temperature detection in small space environments.

optical fiber sensorFabry-Perot interferometerMichelson interferometeroptical vernier effect

杨玉强、张钰颖、高佳乐、边缘、牟小光、王骥、杨文虎、王文华

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广东海洋大学深圳研究院 深圳 518120

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

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

哈尔滨理工大学测控技术与通信工程学院 哈尔滨 150080

广东海洋大学机械工程学院 湛江 524088

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光纤传感器 法布里-珀罗干涉计 迈克尔逊干涉计 光学游标效应

广东省自然科学基金面上项目广东省自然科学基金面上项目深圳市基础研究面上项目深圳市基础研究面上项目广东省普通高校重点领域专项广东海洋大学研究生教育创新计划项目

2023A15150112122022A1515011603JCYJ20210324122813036JCYJ202205301622000012021ZDZX1015202328

2024

10.13382/j.jemi.B2307048

电子测量与仪器学报
中国电子学会

电子测量与仪器学报

CSTPCD北大核心
影响因子：2.52
ISSN：1000-7105
年,卷(期)：2024.38(4)