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沙漏型光纤空气法布里-珀罗微腔的优化设计——面向光谱特性与应变传感技术

Optimal Design of an Hourglass in-Fiber Air Fabry-Perot Microcavity-Towards Spectral Characteristics and Strain Sensing Technology.

作者信息

Wang Qi, Yan Dongchao, Cui Binbin, Guo Zixuan

机构信息

College of Information Science and Engineering, Northeastern University, Shenyang 110819, China.

State Key Laboratory of Synthetical Automation for Process Industries (Northeastern University), Shenyang 110819, China.

出版信息

Sensors (Basel). 2017 Jun 4;17(6):1282. doi: 10.3390/s17061282.

DOI:10.3390/s17061282
PMID:28587221
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5492106/
Abstract

An hourglass in-fiber air microcavity Fabry-Perot interferometer is proposed in this paper, and its second reflecting surface of in-fiber microcavity is designed to be a concave reflector with the best curvature radius in order to improve the spectral characteristics. Experimental results proved that the extinction ratio of Fabry-Perot interferometer with cavity length of 60 μm and concave reflector radius of 60 μm is higher than for a rectangular Fabry-Perot interferometer with cavity length of 60 μm (14 dB: 11 dB). Theory and numerical simulation results show that the strain sensitivity of sensor can be improved by reducing the microcavity wall thickness and microcavity diameter, and when the in-fiber microcavity length is 40 μm, the microcavity wall thickness is 10 μm, the microcavity diameter is 20 μm, and the curvature radius of reflective surface II is 50 μm, the interference fringe contrast of is greater than 0.97, an Axial-pull sensitivity of 20.46 nm/N and resolution of 1 mN can be achieved in the range of 0-1 N axial tension. The results show that the performance of hourglass in-fiber microcavity interferometer is far superior to that of the traditional Fabry-Perot interferometer.

摘要

本文提出了一种沙漏型光纤空气微腔法布里 - 珀罗干涉仪，其光纤微腔的第二反射面设计为具有最佳曲率半径的凹面反射镜，以改善光谱特性。实验结果表明，腔长为60μm且凹面反射镜半径为60μm的法布里 - 珀罗干涉仪的消光比高于腔长为60μm的矩形法布里 - 珀罗干涉仪（14dB：11dB）。理论和数值模拟结果表明，通过减小微腔壁厚和微腔直径可以提高传感器的应变灵敏度，当光纤微腔长度为40μm、微腔壁厚为10μm、微腔直径为20μm且反射面II的曲率半径为50μm时，干涉条纹对比度大于0.97，在0 - 1N轴向拉力范围内可实现20.46nm/N的轴向拉力灵敏度和1mN的分辨率。结果表明，沙漏型光纤微腔干涉仪的性能远优于传统的法布里 - 珀罗干涉仪。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a22/5492106/7fb5bc203336/sensors-17-01282-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a22/5492106/7fb5bc203336/sensors-17-01282-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2a22/5492106/3576ba8d69bf/sensors-17-01282-g010.jpg
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