Monolithic Double Resonator for Quartz Enhanced Photoacoustic Spectroscopy

• Main Authors: Roman Rousseau, Diba Ayache, Nicolas Maurin, Wioletta Trzpil, Michael Bahriz, Aurore Vicet
• Format: Article
• Language: English
• Published: MDPI AG 2021-02-01
• Series: Applied Sciences
• Subjects: photoacoustics; infrared; laser; sensing; QEPAS
• Online Access: https://www.mdpi.com/2076-3417/11/5/2094

A new approach for Quartz Enhanced Photoacoustic Spectroscopy is presented, based on an acoustic excitation from the outside of the prongs of a quartz tuning fork, to increase the sensitivity of the sensor. For this purpose, we introduce a monolithic acoustic double-resonator (double-mR) in a T-shape configuration, using 3D printing. It was modelized and experimentally characterized using a 1392 nm distributed feedback laser diode, targeting a water vapor absorption line. The setup showed a two-factor enhancement of the signal, compared to a classical off-beam QEPAS approach and confirmed the strong interest of photolithographic printing techniques for acoustic developments.