@inproceedings{c7591ee6294f4b3b919a8d8dde23d48f,
title = "Hollow-core fiber Fabry-P{\'e}rot photothermal gas sensing characteristics over the temperature range of 256-354 K",
abstract = "We study the temperature dependance of photothermal signal in a hollow-core fiber (HCF) Fabry-Perot photothermal gas sensor. The photothermal signal generally increases with decreasing temperature, due to the temperature dependent absorption and thermal properties of the gas sample in the hollow-core. The temperature variation also changes the cavity length of the Fabry-Perot, which results in pump power fluctuation in the cavity due to multi-path interference and hence the photothermal signal. This fluctuation can be reduced considerably by applying proper modulation to the pump wavelength. With an 11-cm-long HCF gas cell, we demonstrated a detection limit of \textasciitilde{} 6 ppb acetylene in nitrogen with a 1 s lock-in time constant. With a simple temperature compensation scheme, the photothermal signal fluctuation can be reduced from 48\% to 2\% over the temperature range of 256-354 K.",
keywords = "Gas sensor, Hollow-core fiber, Optical fiber sensor, Photothermal spectroscopy, Temperature effect",
author = "Jingwen Wu and Pengcheng Zhao and Haihong Bao and Ho, \{Hoi Lut\} and Wei Jin",
note = "Publisher Copyright: {\textcopyright} 2025 SPIE.; 29th International Conference on Optical Fiber Sensors ; Conference date: 25-05-2025 Through 30-05-2025",
year = "2025",
month = may,
doi = "10.1117/12.3061611",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
pages = "1--4",
editor = "Santos, \{Jose Luis\} and Sainz, \{Manuel Lopez-Amo\} and Tong Sun",
booktitle = "29th International Conference on Optical Fiber Sensors",
address = "United States",
}