Journal
PHOTOACOUSTICS
Volume 29, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.pacs.2022.100436
Keywords
Photoacoustic spectroscopy; Cavity-enhanced spectroscopy; Hydrogen sulfide; Trace gas detection; Molecular absorption line locking
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We developed a highly sensitive hydrogen sulfide (H2S) gas sensor using the doubly resonant photoacoustic spectroscopy technique and a near-infrared laser. The sensor achieved a minimum detection limit of 10 part per billion in concentration and a normalized noise equivalent absorption coefficient of 8.9 x 10(-12) W cm(-1) Hz(-1/2) by targeting the R(4) transition of H2S. A laser-cavity-molecule locking strategy was proposed to enhance sensor stability for fast measurement when dealing with external disturbances. A comparison with state-of-the-art H2S sensors using various spectroscopic techniques confirmed the record sensitivity achieved in this work.
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.
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