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基于大横向偏移马赫-曾德尔干涉仪的海水高灵敏度折射率传感

The Highly Sensitive Refractive Index Sensing of Seawater Based on a Large Lateral Offset Mach-Zehnder Interferometer.

作者信息

Zhou Jingwen, Sun Yue, Liu Haodong, Li Haibin, Wang Yuye, Jiang Junfeng, Xu Degang, Yao Jianquan

机构信息

School of Marine Science and Technology, Tianjin University, Tianjin 300072, China.

School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China.

出版信息

Sensors (Basel). 2024 Jun 15;24(12):3887. doi: 10.3390/s24123887.

DOI:10.3390/s24123887
PMID:38931671
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11207972/
Abstract

A novel fiber sensor for the refractive index sensing of seawater based on a Mach-Zehnder interferometer has been demonstrated. The sensor consisted of a single-mode fiber (SMF)-no-core fiber (NCF)-single-mode fiber structure (shortened to an SNS structure) with a large lateral offset spliced between the two sections of a multimode fiber (MMF). Optimization studies of the multimode fiber length, offset SNS length, and vertical axial offset distance were performed to improve the coupling efficiency of interference light and achieve the best extinction ratio. In the experiment, a large lateral offset sensor was prepared to detect the refractive index of various ratios of saltwater, which were used to simulate seawater environments. The sensor's sensitivity was up to -13,703.63 nm/RIU and -13,160 nm/RIU in the refractive index range of 1.3370 to 1.3410 based on the shift of the interference spectrum. Moreover, the sensor showed a good linear response and high stability, with an RSD of only 0.0089% for the trough of the interference in air over 1 h.

摘要

一种基于马赫-曾德尔干涉仪的用于海水折射率传感的新型光纤传感器已得到验证。该传感器由单模光纤（SMF）-无芯光纤（NCF）-单模光纤结构（简称为SNS结构）组成，在多模光纤（MMF）的两段之间熔接有较大横向偏移。对多模光纤长度、偏移SNS长度和垂直轴向偏移距离进行了优化研究，以提高干涉光的耦合效率并实现最佳消光比。在实验中，制备了一个大横向偏移传感器来检测不同比例盐水的折射率，这些盐水用于模拟海水环境。基于干涉光谱的偏移，在1.3370至1.3410的折射率范围内，该传感器的灵敏度高达-13703.63 nm/RIU和-13160 nm/RIU。此外，该传感器表现出良好的线性响应和高稳定性，在空气中1小时内干涉谷值的相对标准偏差仅为0.0089%。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/3479694391a3/sensors-24-03887-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/94a554a869c4/sensors-24-03887-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/250a68291920/sensors-24-03887-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/3479694391a3/sensors-24-03887-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/c67178929cd8/sensors-24-03887-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/3e10a547d590/sensors-24-03887-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/17c9d5611fb2/sensors-24-03887-g003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/5637eb9a3315/sensors-24-03887-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/04ade82810e5/sensors-24-03887-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/70fe3a81785a/sensors-24-03887-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/a184849d8c41/sensors-24-03887-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/94a554a869c4/sensors-24-03887-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/250a68291920/sensors-24-03887-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3ba7/11207972/3479694391a3/sensors-24-03887-g011.jpg

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