Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry-Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method

被引：21

作者：

Guo, Zilong ^{[1
,2
]}

Lv, Wentao ^{[1
]}

Wang, Wei ^{[1
,2
]}

Chen, Qingqing ^{[1
]}

Zhang, Xiongxing ^{[1
,2
]}

Chen, Haibin ^{[1
,2
]}

Ma, Zhibo ^{[3
,4
]}

机构：

[1] Xian Technol Univ, Sch Optoelect Engn, Xian 710021, Shaanxi, Peoples R China

[2] Xian Technol Univ, Shaanxi Prov Key Lab Photoelect Measurement & Ins, Xian 710021, Shaanxi, Peoples R China

[3] Minist Educ, Key Lab Micro Nano Syst Aerosp, Xian 710072, Shaanxi, Peoples R China

[4] Northwestern Polytech Univ, Shaanxi Key Lab MEMS NEMS, Xian 710072, Shaanxi, Peoples R China

来源：

SENSORS | 2019年 / 19卷 / 07期

基金：

中国国家自然科学基金;

关键词：

fiber optic sensor; Fabry-Perot cavity; compound cavity; white light interferometry; non-scanning correlation method; INTERFEROMETRY;

D O I：

10.3390/s19071628

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute length of the air cavity of fiber-optic compound Fabry-Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for cavity length matching, correlation interferometric signal of the basal cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, cavity length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry-Perot pressure sensor under different pressures. For a pressure range of 0.1 similar to 2.9 Mpa, the linear relationship between the air cavity length and the gas pressure imposed was successfully extracted.

引用

页数：13

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