Low power consumption quartz-enhanced photoacoustic gas sensor employing a quantum cascade laser in pulsed operation

Abstract

We report here an analysis of the performance of a quartz-enhanced photoacoustic (QEPAS) system operating in a pulsed mode by employing a quantum cascade laser (QCL). The QEPAS system is based on a quartz tuning fork (QTF) having fundamental resonance frequency of 4.2 kHz and a first overtone resonance of 25.4 KHz. Water vapor was used as a target gas by selecting its absorption line falling at 1296.5 cm-1 with a line strength of 1.69⋅10-22 cm/molecule. The QEPAS signal was investigated, while varying the QCL duty-cycle from continuous wave operation, down to 5%, which corresponds to a laser power consumption of 0.17 mW and a pulse-width of 4 μs.

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Sampaolo, Angelo, Patimisco, Pietro, Gluszek, Aleksander, et al.. "Low power consumption quartz-enhanced photoacoustic gas sensor employing a quantum cascade laser in pulsed operation." Proceedings of SPIE, 10111, (2017) SPIE: http://dx.doi.org/10.1117/12.2252326.

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