We present an optical sensor based on light-induced thermoelastic spectroscopy for the detection of hydrogen sulfide (HS) in sulfur hexafluoride (SF). The sensor incorporates a compact multi-pass cell measuring 6 cm × 4 cm × 4 cm and utilizes a quartz tuning fork (QTF) photodetector. A 1.58 µm near-infrared distributed feedback (DFB) laser with an optical power of 30 mW serves as the excitation source. The sensor achieved a minimum detection limit (MDL) of ∼300 ppb at an integration time of 300 ms, corresponding to a normalized noise equivalent absorption coefficient (NNEA) of 3.96 × 10 W·cm·Hz. By extending the integration time to 100 s, the MDL can be reduced to ∼25 ppb. The sensor exhibits a response time of ∼1 min for a gas flow rate of 70 sccm.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10658605 | PMC |
| http://dx.doi.org/10.1016/j.pacs.2023.100553 | DOI Listing |
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