We present an optical sensor based on light-induced thermoelastic spectroscopy for the detection of hydrogen sulfide (H2S) in sulfur hexafluoride (SF6). 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− 9 W⋅cm− 1⋅Hz− 1/2. 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.
Light-induced thermoelastic sensor for ppb-level H2S detection in a SF6 gas matrices exploiting a mini-multi-pass cell and quartz tuning fork photodetector / Sun, B.; Patimisco, P.; Sampaolo, A.; Zifarelli, A.; Spagnolo, V.; Wu, H.; Dong, L.. - In: PHOTOACOUSTICS. - ISSN 2213-5979. - ELETTRONICO. - 33:(2023). [10.1016/j.pacs.2023.100553]
Light-induced thermoelastic sensor for ppb-level H2S detection in a SF6 gas matrices exploiting a mini-multi-pass cell and quartz tuning fork photodetector
Sun B.;Patimisco P.;Sampaolo A.;Zifarelli A.;Spagnolo V.
;
2023-01-01
Abstract
We present an optical sensor based on light-induced thermoelastic spectroscopy for the detection of hydrogen sulfide (H2S) in sulfur hexafluoride (SF6). 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− 9 W⋅cm− 1⋅Hz− 1/2. 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
