Wavelength- and Intensity-Demodulated Dual-Wavelength Fiber Laser Sensor for Simultaneous RH and Temperature Detection

Bin Yin; Guofeng Sang; Ran Yan; Yuheng Wu; Songhua Wu; Muguang Wang; Wenqi Liu; Haisu Li; Qichao Wang

doi:10.1109/ACCESS.2020.2979470

IEEE Access (Jan 2020)

Wavelength- and Intensity-Demodulated Dual-Wavelength Fiber Laser Sensor for Simultaneous RH and Temperature Detection

Bin Yin,
Guofeng Sang,
Ran Yan,
Yuheng Wu,
Songhua Wu,
Muguang Wang,
Wenqi Liu,
Haisu Li,
Qichao Wang

Affiliations

Bin Yin: ORCiD; College of Information Science and Engineering, Ocean Remote Sensing Institute, Ocean University of China, Qingdao, China
Guofeng Sang: College of Information Science and Engineering, Ocean Remote Sensing Institute, Ocean University of China, Qingdao, China
Ran Yan: College of Information Science and Engineering, Ocean Remote Sensing Institute, Ocean University of China, Qingdao, China
Yuheng Wu: College of Information Science and Engineering, Ocean Remote Sensing Institute, Ocean University of China, Qingdao, China
Songhua Wu: College of Information Science and Engineering, Ocean Remote Sensing Institute, Ocean University of China, Qingdao, China
Muguang Wang: ORCiD; Institute of Lightwave Technology, Beijing Jiaotong University, Beijing, China
Wenqi Liu: Chinese Academy of Sciences, Qingdao Institute of Bioenergy and Bioprocess Technology, Qingdao, China
Haisu Li: Institute of Lightwave Technology, Beijing Jiaotong University, Beijing, China
Qichao Wang: College of Information Science and Engineering, Ocean Remote Sensing Institute, Ocean University of China, Qingdao, China

DOI: https://doi.org/10.1109/ACCESS.2020.2979470
Journal volume & issue: Vol. 8
pp. 52091 – 52099

Abstract

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We report a dual-wavelength fiber laser sensor based on a uniform fiber Bragg grating (UFBG) and a Polyvinyl alcohol (PVA) film-coated long-period grating (LPG) as sensor probe for simultaneous detection of relative humidity (RH) and temperature. Two UFBGs and the LPG were inscribed in three single mode fibers utilizing phase/amplitude mask technology and mobile scanning technique via the 248 nm UV laser. In our experiment, the RH function based on the differential intensity measurement at dual-wavelength output from 30% to 85% is in a quadratic equation, and the RH sensitivity coefficient of 0.358 dB/% shows good linear relationship and stability from 55% to 85%. Meanwhile, the temperature sensitivity coefficients based on wavelength detection and differential intensity detection are 9.1 pm/°C and 0.21 dB/°C, respectively. The structure of dual-wavelength fiber laser sensor with high signal to noise ratio (SNR), narrow spectral width and good stability enables simultaneous measurement of the RH and temperature with high accuracy and good repeatability.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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