Open AccessQuartz-enhanced photoacoustic spectroscopy exploiting tuning fork overtone modes
Author(s) -
Angelo Sampaolo,
Pietro Patimisco,
Lei Dong,
Antonina Geras,
Gaetano Scamarcio,
Tomasz Starecki,
Frank K. Tittel,
Vincenzo Spagnolo
Publication year - 2015
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.4937002
Subject(s) - overtone , photoacoustic spectroscopy , tuning fork , resonance (particle physics) , spectroscopy , noise (video) , materials science , chemistry , optoelectronics , optics , vibration , atomic physics , photoacoustic imaging in biomedicine , acoustics , physics , spectral line , computer science , image (mathematics) , quantum mechanics , astronomy , artificial intelligence
We report on a quartz-enhanced photoacoustic sensor (QEPAS) based on a custom-made quartz tuning fork (QTF) to operate in both the fundamental and the first overtone vibrational mode resonances. The QTF fundamental mode resonance falls at ∼3 kHz and the first overtone at ∼18 kHz. Electrical tests showed that the first overtone provides a higher quality factor and increased piezoelectric current peak values, with respect to the fundamental flexural mode. To evaluate the QTF acousto-electric energy conversion efficiency, we operated the QEPAS in the near-IR and selected water vapor as the target gas. The first overtone resonance provides a QEPAS signal-to-noise ratio ∼5 times greater with respect to that measured for the fundamental mode. These results open the way to employing QTF overtone vibrational modes for QEPAS based trace gas sensing.
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