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Demodulation of Fabry–Perot sensors using random speckles

Authors :
Qin Liang
Jinchao Tao
Xu Wang
Tianliang Wang
Xinyu Gao
Pengwei Zhou
Ben Xu
Chunliu Zhao
Juan Kang
Le Wang
Changyu Shen
Dongning Wang
Yi Li
Source :
Optics Letters. 47:4806
Publication Year :
2022
Publisher :
Optica Publishing Group, 2022.

Abstract

Random speckles are proposed to demodulate Fabry–Perot (FP) sensors in this study. A piece of multimode fiber is used to interrogate the FP transmission spectrum, and tiny spectral changes lead to significant variations in the generated speckle patterns. In the demonstration experiments, the pressure resolution of 0.001 MPa can be obtained from an open cavity FP sensor based on the convolutional neural network (CNN) demodulation algorithm. It is worth noting that the spectral differences in neighboring orders can be precisely distinguished due to the high sensitivity of speckles. Thus, the fringe-order ambiguity problem is solved and the dynamic measurement range can be greatly improved. The speckle-based demodulation scheme provides a new way to balance resolution, dynamic range, speed, and cost of FP sensors.

Details

ISSN :
15394794 and 01469592
Volume :
47
Database :
OpenAIRE
Journal :
Optics Letters
Accession number :
edsair.doi.dedup.....130316da717227fc7629d919eea02410