Parts-per-billion-level detection of hydrogen sulfide based on doubly resonant photoacoustic spectroscopy with line-locking

Year: 2023

Authors: Zhang H.; Wang Z.; Wang Q.; Borri S.; Galli I.; Sampaolo A.; Patimisco P.; Spagnolo V.L.; De Natale P.; Ren W.

Autors Affiliation: Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Appl Opt, Changchun 130033, Peoples R China; Univ Chinese Acad Sci, Beijing 100049, Peoples R China; Chinese Univ Hong Kong, Dept Mech & Automat Engn, Hong Kong, Peoples R China; CNR INO Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; LENS European Lab Nonlinear Spect, I-50019 Sesto Fiorentino, Italy; Univ & Politecn Bari, Dipartimento Interateneo Fis, PolySense Lab, Via Amendola 173, Bari, Italy.

Abstract: We report on the development of a highly sensitive hydrogen sulfide (H2S) gas sensor exploiting the doubly resonant photoacoustic spectroscopy technique and using a near-infrared laser emitting at 1578.128 nm. By targeting the R(4) transition of H2S, we achieved a minimum detection limit of 10 part per billion in concen-tration and a normalized noise equivalent absorption coefficient of 8.9 x 10(-12) W cm(-1) Hz(-1/2). A laser-cavity-molecule locking strategy is proposed to enhance the sensor stability for fast measurement when dealing with external disturbances. A comparison among the state-of-the-art H2S sensors using various spectroscopic tech-niques confirmed the record sensitivity achieved in this work.

Journal/Review: PHOTOACOUSTICS

Volume: 29      Pages from: 100436-1  to: 100436-8

More Information: This research was supported by the Second Comprehensive Scientific Investigation of the Qinghai-Tibet Plateau (2019QZKK020802) , the National Natural Science Foundation of China (NSFC) (62005267) , the Young Talent of Lifting Engineering for Science and Technology in Jilin, China (QT202106) , and CIOMP International Cooperation Fund.
KeyWords: Photoacoustic spectroscopy; Cavity-enhanced spectroscopy; Hydrogen sulfide; Trace gas detection; Molecular absorption line locking
DOI: 10.1016/j.pacs.2022.100436

Citations: 20
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