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Article

Additively Manufactured Detection Module with Integrated Tuning Fork for Enhanced Photo-Acoustic Spectroscopy

Consorzio CREO, 67100 L’Aquila, Italy
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Academic Editor: Roberto Pizzoferrato
Sensors 2022, 22(19), 7193; https://doi.org/10.3390/s22197193
Received: 2 September 2022 / Revised: 14 September 2022 / Accepted: 19 September 2022 / Published: 22 September 2022
(This article belongs to the Collection Optical Chemical Sensors: Design and Applications)
Starting from Quartz-Enhanced Photo-Acoustic Spectroscopy (QEPAS), we have explored the potential of a tightly linked method of gas/vapor sensing, from now on referred to as Tuning-Fork-Enhanced Photo-Acoustic Spectroscopy (TFEPAS). TFEPAS utilizes a non-piezoelectric metal or dielectric tuning fork to transduce the photoacoustic excitation and an optical interferometric readout to measure the amplitude of the tuning fork vibration. In particular, we have devised a solution based on Additive Manufacturing (AM) for the Absorption Detection Module (ADM). The novelty of our solution is that the ADM is entirely built monolithically by Micro-Metal Laser Sintering (MMLS) or other AM techniques to achieve easier and more cost-effective customization, extreme miniaturization of internal volumes, automatic alignment of the tuning fork with the acoustic micro-resonators, and operation at high temperature. This paper reports on preliminary experimental results achieved with ammonia at parts-per-million concentration in nitrogen to demonstrate the feasibility of the proposed solution. Prospectively, the proposed TFEPAS solution appears particularly suited for hyphenation to micro-Gas Chromatography and for the analysis of complex solid and liquid traces samples, including compounds with low volatility such as illicit drugs, explosives, and persistent chemical warfare agents. View Full-Text
Keywords: gas analyzer; PAS; tuning fork; micro additive manufacturing; interferometric readout gas analyzer; PAS; tuning fork; micro additive manufacturing; interferometric readout
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MDPI and ACS Style

Viola, R.; Liberatore, N.; Mengali, S. Additively Manufactured Detection Module with Integrated Tuning Fork for Enhanced Photo-Acoustic Spectroscopy. Sensors 2022, 22, 7193. https://doi.org/10.3390/s22197193

AMA Style

Viola R, Liberatore N, Mengali S. Additively Manufactured Detection Module with Integrated Tuning Fork for Enhanced Photo-Acoustic Spectroscopy. Sensors. 2022; 22(19):7193. https://doi.org/10.3390/s22197193

Chicago/Turabian Style

Viola, Roberto, Nicola Liberatore, and Sandro Mengali. 2022. "Additively Manufactured Detection Module with Integrated Tuning Fork for Enhanced Photo-Acoustic Spectroscopy" Sensors 22, no. 19: 7193. https://doi.org/10.3390/s22197193

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