Fast and accurate gas sensing through beat-frequency quartz-enhanced photoacoustic spectroscopy

Giansergio Menduni; Biao Li; Andrea Zifarelli; Marilena Giglio; Angelo Sampaolo; Pietro Patimisco; Valeria Villada; Tingting Wei; Hongpeng Wu; Lei Dong; Vincenzo Spagnolo

doi:10.1117/12.3001652

8 March 2024 Fast and accurate gas sensing through beat-frequency quartz-enhanced photoacoustic spectroscopy

Giansergio Menduni, Biao Li, Andrea Zifarelli, Marilena Giglio, Angelo Sampaolo, Pietro Patimisco, Valeria Villada, Tingting Wei, Hongpeng Wu, Lei Dong, Vincenzo Spagnolo

Author Affiliations +

Proceedings Volume 12895, Quantum Sensing and Nano Electronics and Photonics XX; 128950Q (2024) https://doi.org/10.1117/12.3001652
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Quartz-enhanced photoacoustic spectroscopy (QEPAS) is a highly sensitive optical technique, suitable for real-time and in situ trace gas detection. In QEPAS, Quartz tuning forks (QTF) are employed as piezoelectric transducers of sound waves, induced by gas non-radiative energy relaxation following an infrared modulated light absorption. The generated electric signal depends on the gas concentration. An accurate and reliable QEPAS measurement requires: i) the QTF characterization, in terms of resonance frequency and quality factor and ii) the tuning range scan of the laser employed to detect the selected gas. These two operations could take several minutes. Beat frequency QEPAS (BF-QEPAS) is an alternative approach to standard QEPAS. In BF-QEPAS, a fast scan of the laser tuning range is employed to generate an acoustic pulse. Gas concentration, QTF resonance frequency, and quality factor can be measured acquiring and analyzing the transient response of the QTF to the acoustic pulse. In this work, a custom T-shaped QTF was employed to detect nitrogen monoxide (NO), targeting its absorption feature at 1900.07 cm^-1 with an interband cascade laser. A minimum detection limit as low as 180 ppb of NO at an integration time of 5 ms was achieved, and a highly accurate measurement of the QTF resonance frequency and quality factor were demonstrated using BF-QEPAS. Finally, the possibility to fully scan the laser tuning range in less than 15 s was proved.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Giansergio Menduni, Biao Li, Andrea Zifarelli, Marilena Giglio, Angelo Sampaolo, Pietro Patimisco, Valeria Villada, Tingting Wei, Hongpeng Wu, Lei Dong, and Vincenzo Spagnolo "Fast and accurate gas sensing through beat-frequency quartz-enhanced photoacoustic spectroscopy", Proc. SPIE 12895, Quantum Sensing and Nano Electronics and Photonics XX, 128950Q (8 March 2024); https://doi.org/10.1117/12.3001652

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