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.
Study of the effect of the low-pass filter time constant on the noise level of Quartz Enhanced Photoacoustic Spectroscopy sensors / Di Gioia, M.; Menduni, G.; Zifarelli, A.; Sampaolo, A.; Patimisco, P.; Giglio, M.; Marzocca, C.; Spagnolo, V.. - 12430:(2023). (Intervento presentato al convegno Quantum Sensing and Nano Electronics and Photonics XIX 2023 tenutosi a usa nel 2023) [10.1117/12.2650312].
Study of the effect of the low-pass filter time constant on the noise level of Quartz Enhanced Photoacoustic Spectroscopy sensors
Di Gioia M.;Menduni G.;Sampaolo A.;Patimisco P.;Giglio M.;Marzocca C.;Spagnolo V.
2023-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
