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Title: Distributed gas sensing with optical fibre photothermal interferometry
Authors: Lin, Y 
Liu, F
He, X
Jin, W 
Zhang, M
Yang, F 
Ho, HL 
Tan, Y 
Gu, L
Issue Date: 11-Dec-2017
Source: Optics express, 2017, v. 25, no. 25, p. 31568-31585
Abstract: We report the first distributed optical fibre trace-gas detection system based on photothermal interferometry (PTI) in a hollow-core photonic bandgap fibre (HC-PBF). Absorption of a modulated pump propagating in the gas-filled HC-PBF generates distributed phase modulation along the fibre, which is detected by a dual-pulse heterodyne phase-sensitive optical time-domain reflectometry (OTDR) system. Quasi-distributed sensing experiment with two 28-meter-long HC-PBF sensing sections connected by single-mode transmission fibres demonstrated a limit of detection (LOD) of ~10 ppb acetylene with a pump power level of 55 mW and an effective noise bandwidth (ENBW) of 0.01 Hz, corresponding to a normalized detection limit of 5.5ppb.W/√Hz. Distributed sensing experiment over a 200-meter-long sensing cable made of serially connected HC-PBFs demonstrated a LOD of ~ 5 ppm with 62.5 mW peak pump power and 11.8 Hz ENBW, or a normalized detection limit of 312ppb.W/√Hz. The spatial resolution of the current distributed detection system is limited to ~ 30 m, but it is possible to reduce down to 1 meter or smaller by optimizing the phase detection system.
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.25.031568
Rights: © 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (
© 2017 Optica Publishing Group under the terms of the Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
The following publication Yuechuan Lin, Fei Liu, Xiangge He, Wei Jin, Min Zhang, Fan Yang, Hoi Lut Ho, Yanzhen Tan, and Lijuan Gu, "Distributed gas sensing with optical fibre photothermal interferometry," Opt. Express 25, 31568-31585 (2017) is available at
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