Open Access

Sensors, volume 19, issue 7, pages 1628

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

Zilong Guo ^{1, 2}

Wentao Lv ¹

Wei Wang ^{1, 2}

Qingqing Chen ¹

Xiongxing Zhang ^{1, 2}

Haibin Chen ^{1, 2}

Zhibo Ma ^{3, 4}

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School of Optoelectronic Engineering, Xi’an Technological University, Xi’an 710021, China |

Shaanxi Province Key Lab of Photoelectric Measurement and Instrument Technology, Xi’an Technological University, Xi’an 710021, China |

Key Lab of Micro/Nano Systems for Aerospace, Ministry of Education, Xi’an 710072, China |

⁴

Shaanxi Key Lab of MEMS/NEMS, Northwestern Polytechnical University, Xi’an 710072, China |

Publication type: Journal Article

Publication date: 2019-04-05

MDPI

Journal: Sensors

scimago Q1

SJR: 0.786

CiteScore: 7.3

Impact factor: 3.4

ISSN: 14243210, 14248220

DOI: 10.3390/s19071628

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PubMed ID: 30959736

Biochemistry

Analytical Chemistry

Atomic and Molecular Physics, and Optics

Electrical and Electronic Engineering

Instrumentation

Abstract

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 0.1~2.9 Mpa, the linear relationship between the air cavity length and the gas pressure imposed was successfully extracted.

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Publisher

MDPI

Journal

Sensors

scimago Q1

SJR

0.786

CiteScore

7.3

Impact factor

3.4

ISSN

14243210 (Print)

14248220 (Print, Electronic)

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

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