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Acoustic Detection Module Design of a Quartz-Enhanced Photoacoustic Sensor
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Sensors 2019, 19(6), 1362; https://doi.org/10.3390/s19061362

Quartz Enhanced Photoacoustic Spectroscopy Based on a Custom Quartz Tuning Fork

1
Mirsense, Nanno-INNOV, building 863, 8 Avenue de la Vauve, 91120 Palaiseau, France
2
DPHY, ONERA, Université Paris Saclay, F-91123 Palaiseau, France
*
Authors to whom correspondence should be addressed.
Received: 14 February 2019 / Revised: 14 March 2019 / Accepted: 14 March 2019 / Published: 19 March 2019
(This article belongs to the Special Issue Optical Sensing and Imaging, from UV to THz Range)
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Abstract

We have designed and fabricated a custom quartz tuning fork (QTF) with a reduced fundamental frequency; a larger gap between the prongs; and the best quality factor in air at atmospheric conditions ever reported, to our knowledge. Acoustic microresonators have been added to the QTF in order to enhance the sensor sensitivity. We demonstrate a normalized noise equivalent absorption (NNEA) of 3.7 × 10−9 W.cm−1.Hz−1/2 for CO2 detection at atmospheric pressure. The influence of the inner diameter and length of the microresonators has been studied, as well as the penetration depth between the QTF’s prongs. We investigated the acoustic isolation of our system and measured the Allan deviation of the sensor. View Full-Text
Keywords: QEPAS; photoacoustic spectroscopy; quartz tuning fork QEPAS; photoacoustic spectroscopy; quartz tuning fork
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Duquesnoy, M.; Aoust, G.; Melkonian, J.-M.; Lévy, R.; Raybaut, M.; Godard, A. Quartz Enhanced Photoacoustic Spectroscopy Based on a Custom Quartz Tuning Fork. Sensors 2019, 19, 1362.

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