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基于葡萄牙国家工程、新技术、科学和技术研究所电弧诱导长周期光栅的光纤干涉仪

Optical Fiber Interferometers Based on Arc-Induced Long Period Gratings at INESC TEC.

作者信息

Caldas Paulo, Rego Gaspar

机构信息

proMetheus, Instituto Politécnico de Viana do Castelo, Rua Escola Industrial e Comercial Nun'Álvares, 4900-347 Viana do Castelo, Portugal.

Center for Applied Photonics, INESC TEC, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.

出版信息

Sensors (Basel). 2021 Nov 7;21(21):7400. doi: 10.3390/s21217400.

DOI:10.3390/s21217400
PMID:34770705
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8588512/
Abstract

In this work, we review the most important achievements of an INESC TEC long-period-grating-based fiber optic Michelson and Mach-Zehnder configuration modal interferometer with coherence addressing and heterodyne interrogation as a sensing structure for measuring environmental refractive index and temperature. The theory for Long Period Grating (LPG) interferometers and coherence addressing and heterodyne interrogation is presented. To increase the sensitivity to external refractive index and temperature, several LPG interferometers parameters are studied, including order of cladding mode, a reduction of the fiber diameter, different type of fiber, cavity length and the antisymmetric nature of cladding modes.

摘要

在这项工作中，我们回顾了葡萄牙国家工程、新技术、科学和技术研究所（INESC TEC）基于长周期光栅的光纤迈克尔逊和马赫曾德尔配置模态干涉仪的最重要成果，该干涉仪采用相干寻址和外差探测作为测量环境折射率和温度的传感结构。介绍了长周期光栅（LPG）干涉仪以及相干寻址和外差探测的理论。为了提高对外部折射率和温度的灵敏度，研究了几个LPG干涉仪参数，包括包层模阶数、光纤直径减小、不同类型的光纤、腔长以及包层模的反对称特性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9146/8588512/9e02ab48048c/sensors-21-07400-g018.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9146/8588512/9e02ab48048c/sensors-21-07400-g018.jpg

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