Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/73986
Title: Pulsed photothermal interferometry for high sensitivity gas detection with hollow-core photonic bandgap fibre
Authors: Lin, Y 
Jin, W 
Yang, F 
Ho, HL 
Keywords: Optical fibre sensor
Photothermal interferometry
Gas sensor
Photonic crystal fibre
Spectroscopy
Issue Date: 2017
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2017, v. 10323, 1032388, p. 2 How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
Abstract: Pulsed photothermal interferometry (PTI) gas sensor with hollow-core photonic bandgap fibre (HC-PBF) is demonstrated with a Sagnac interferometer-based phase detection system. Under the condition of constant peak pump power, the optimal pulse duration is found to be > 1:2 μs for detecting low-concentration of trace gases in nitrogen, limited by thermal conduction of gases within the hollow-core. Preliminary experiments with a 0.62-mlong HC-PBF gas cell, low peak power (∼ 20:2mW) and a boxcar averager with 10k average times demonstrated a detection limit of 3:3 p:p:m acetylene. Detection limit down to ppb or lower is expected with high peak power pump pulses.
Description: 25th International Conference on Optical Fiber Sensors, OFS 2017, 24 - 28 April 2017
URI: http://hdl.handle.net/10397/73986
ISBN: 9781510610910
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.2265498
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