Fiber optic temperature sensor based on enhanced harmonic vernier effect

被引：0
作者：
Lin, Zixi [1 ,3 ]
Li, Yuting [2 ,3 ]
Yang, Yuqiang [1 ,2 ,4 ]
Li, Yitong [2 ,3 ,4 ]
Zhang, Yuying [2 ,4 ]
机构：
[1] Shenzhen Institute, Guangdong Ocean University, Shenzhen
[2] Guangdong Provincial Key Laboratory of Intelligent Equipment for South China Sea Marine Ranching, Guangdong Ocean University, Zhanjiang
[3] College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang
[4] Research Center of Guangdong Smart Oceans Sensor Networks and Equipment Engineering, Guangdong Ocean University, Zhanjiang
来源：
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2024年 / 32卷 / 15期
关键词：
enhanced vernier effect; Fabry-Perot interferometer; fiber-optic sensor; harmonic vernier effect; Sagnac interferometer; temperature sensors;
D O I：
10.37188/OPE.20243215.2344
中图分类号：
学科分类号：
摘要：
The proposed temperature sensor utilizes the enhanced harmonic vernier effect in an optical fi⁃ ber system, combining an optical fiber Sagnac interferometer (SI) with a Fabry-Perot interferometer (FPI). By aligning the FPI's free spectral range as a multiple of the SI's, with opposite temperature responses, the enhanced harmonic vernier effect is achieved. Experiments show that this effect and the enhanced nor⁃ mal vernier effect have comparable temperature sensitivity, being 28.7 and 16.9 times greater than those of single FPI and SI, respectively. In addition, the magnification of the enhanced harmonic vernier is 3.4 and 1.8 times that of the normal harmonic vernier. However, the detuning of the Panda fiber length for the en⁃ hanced harmonic vernier effect is significantly larger than for the enhanced normal vernier effect, with de⁃ tuning increasing with order. The enhanced harmonic vernier's magnification is also easier to control at higher orders. The sensor demonstrates high sensitivity, excellent stability, and low preparation cost, of⁃ fering promising prospects for practical applications. © 2024 Chinese Academy of Sciences. All rights reserved.
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页码：2344 / 2354
页数：10
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