Study of the effect of the low-pass filter time constant on the noise level of quartz-enhanced photoacoustic spectroscopy sensors

Michele Di Gioia; Giansergio Menduni; Andrea Zifarelli; Angelo Sampaolo; Pietro Patimisco; Marilena Giglio; Cristoforo Marzocca; Vincenzo Spagnolo

doi:10.1117/12.2650312

15 March 2023 Study of the effect of the low-pass filter time constant on the noise level of quartz-enhanced photoacoustic spectroscopy sensors

Michele Di Gioia, Giansergio Menduni, Andrea Zifarelli, Angelo Sampaolo, Pietro Patimisco, Marilena Giglio, Cristoforo Marzocca, Vincenzo Spagnolo

Author Affiliations +

Proceedings Volume 12430, Quantum Sensing and Nano Electronics and Photonics XIX; 124300V (2023) https://doi.org/10.1117/12.2650312
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) is a sensitive trace gas detection technique employing Quartz Tuning Forks (QTF) as sensitive elements. Usually, a transimpedance amplifier is used as QTF front-end electronic, with a 10 MΩ feedback resistor. With a low-pass filter time constant of 100 ms, the thermal noise of the QTF intrinsic resistance (~100 kΩ) represents the main noise contribution. For real-time applications, shorter time constants need to be employed. In this work, we studied different amplifier structures with the aim to reduce the QTF thermal noise and improve the signalto- noise ratio when the QTF is used in QEPAS sensors.

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Michele Di Gioia, Giansergio Menduni, Andrea Zifarelli, Angelo Sampaolo, Pietro Patimisco, Marilena Giglio, Cristoforo Marzocca, and Vincenzo Spagnolo "Study of the effect of the low-pass filter time constant on the noise level of quartz-enhanced photoacoustic spectroscopy sensors", Proc. SPIE 12430, Quantum Sensing and Nano Electronics and Photonics XIX, 124300V (15 March 2023); https://doi.org/10.1117/12.2650312

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