Distributed gas sensing with optical fibre photothermal interferometry

Distributed gas sensing with optical fibre photothermal interferometry

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 d...

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Veröffentlicht in:Optics express 2017-12, Vol.25 (25), p.31568-31585
Hauptverfasser: Lin, Yuechuan, Liu, Fei, He, Xiangge, Jin, Wei, Zhang, Min, Yang, Fan, Ho, Hoi Lut, Tan, Yanzhen, Gu, Lijuan
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container_end_page 31585
container_issue 25
container_start_page 31568
container_title Optics express
container_volume 25
creator Lin, Yuechuan
Liu, Fei
He, Xiangge
Jin, Wei
Zhang, Min
Yang, Fan
Ho, Hoi Lut
Tan, Yanzhen
Gu, Lijuan
description 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.
doi_str_mv 10.1364/OE.25.031568
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title Distributed gas sensing with optical fibre photothermal interferometry
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