Pulsed photothermal interferometry for high sensitivity gas detection with hollow-core photonic bandgap fibre

Yuechuan Lin; Wei Jin; Fan Yang; Hoi Lut Ho

doi:10.1117/12.2265498

23 April 2017 Pulsed photothermal interferometry for high sensitivity gas detection with hollow-core photonic bandgap fibre

Yuechuan Lin, Wei Jin, Fan Yang, Hoi Lut Ho

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 1032388 (2017) https://doi.org/10.1117/12.2265498
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

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.

Citation Download Citation

Yuechuan Lin, Wei Jin, Fan Yang, and Hoi Lut Ho "Pulsed photothermal interferometry for high sensitivity gas detection with hollow-core photonic bandgap fibre", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 1032388 (23 April 2017); https://doi.org/10.1117/12.2265498

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