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.
Angelo Sampaolo, Pietro Patimisco, Aleksander Gluszek, Arkadiusz Hudzikowski, Marilena Giglio, Huadan Zheng, Frank K. Tittel, and Vincenzo Spagnolo, "Low power consumption quartz-enhanced photoacoustic gas sensor employing a quantum cascade laser in pulsed operation," Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101110C (Presented at SPIE OPTO: January 29, 2017; Published: 27 January 2017); https://doi.org/10.1117/12.2252326.
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