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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: 2017
Publisher: Optical Society of America
Source: Optics express, 2017, v. 25, no. 25, p. 31568-31585 How to cite?
Journal: Optics express 
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.
EISSN: 1094-4087
DOI: 10.1364/OE.25.031568
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