Abstract

A dual-parameter sensing structure based on a fiber Bragg grating (FBG) incorporated side-open Fabry-Perot cavity (FPC) is proposed and experimentally demonstrated for simultaneous measurements of gas pressure and temperature. The side-open FPC consisted of a micro-piece of chemical etched side-hole fiber acts as a pressure sensing unit. Two samples with different cavity lengths of 60 μm and 100 μm were fabricated and tested for gas pressure and temperature sensing in the experiment. Linear gas pressure responses of 4.063 pm/kPa and 4.071 pm/kPa in a large measuring range of 0-1000 kPa were obtained, respectively, which agree well with the theoretical analysis. Meanwhile, the temperature cross-sensitivities were measured as 214 Pa/° and 204 Pa/°. As a local temperature monitor, the incorporation of a short FBG in the leading single mode fiber was used to compensate the temperature cross-sensitivity of the sensor. This kind of compact and highly sensitive fiber sensor is appropriate for simultaneous gas pressure and temperature sensing in harsh micro environment.

© 2016 IEEE

Enhanced wide-range gas pressure sensing with an all-solid open Fabry–Pérot interferometer

Xinyu Zhao, Jiandong Bai, Yongqiu Zheng, Zhenyin Hai, Jiamin Chen, Junping Zhang, Yonghua Wang, and Chenyang Xue
Opt. Express 31(18) 29994-30004 (2023)

Measurement of high pressure and high temperature using a dual-cavity Fabry–Perot interferometer created in cascade hollow-core fibers

Zhe Zhang, Jun He, Bin Du, Fengchan Zhang, Kuikui Guo, and Yiping Wang
Opt. Lett. 43(24) 6009-6012 (2018)

Simultaneous measurement of pressure and temperature by employing Fabry-Perot interferometer based on pendant polymer droplet

Bing Sun, Yiping Wang, Junle Qu, Changrui Liao, Guolu Yin, Jun He, Jiangtao Zhou, Jian Tang, Shen Liu, Zhengyong Li, and Yingjie Liu
Opt. Express 23(3) 1906-1911 (2015)

Compound Fabry–Pérot interferometer for simultaneous high-pressure and high-temperature measurement

Zhangwei Ma, Jintao Chen, Heming Wei, Liang Zhang, Zhifeng Wang, Zhenyi Chen, Fufei Pang, and Tingyun Wang
Opt. Express 29(15) 24289-24299 (2021)

Gas refractometer based on a side-open fiber optic Fabry–Perot interferometer

Ruohui Wang, Pingchao Huang, Jiawei He, and Xueguang Qiao
Appl. Opt. 56(1) 50-54 (2017)