The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 9.94) reporting on a on a Near-IR quartz-enhanced photoacoustic sensor (QEPAS) for H2S leaks detection in matrixes containing up to 1 % of methane (CH4). An investigation of the influence of CH4 on H2S relaxation and photoacoustic generation was proposed in this work and the sensor performances were carefully assessed with respect to CH4 content in the mixture. We demonstrated the high selectivity, with no cross talk between H2S, H2O and CH4 absorption lines, high sensitivity, and fast response time of the developed sensor, achieving a minimum detection limit (MDL) of 2.5 ppm for H2S with 2 s lock-in integration time. The employed 2.6 µm laser allowed us to employ the sensor also for CH4 detection, achieving an MDL of 85 ppm. The realized QEPAS sensor lends itself to the development of a portable and compact device for industrial monitoring.
The following link provides access to the article:
http://polysense.poliba.it/wp-content/uploads/2022/12/151_H2S-in-CH4_-photoacoustics-2023.pdf
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