Benzene sensing by Quartz Enhanced Photoacoustic Spectroscopy at 14.85 µm

Diba Ayache (1) , Wioletta Trzpil (1) , Roman Rousseau (1) , Kumar Kinjalk (1) , Roland Teissier (1) , Alexei Baranov (1) , Michael Bahriz (1) , Aurore Vicet (1)

1 NANOMIR - Composants à Nanostructure pour le moyen infrarouge

Benzene is a gas known to be highly pollutant for the environment, for the water and cancerogenic for humans. In this paper, we present a sensor based on Quartz Enhanced Photoacoustic Spectroscopy dedicated to benzene analysis. Exploiting the infrared emission of a 14.85 µm quantum cascade laser, the sensor is working in an off-beam configuration, allowing easy alignment and stable measurements. The technique provides a very good selectivity to the sensor and a limit of detection of 30 ppbv in 1 s, i.e. a normalized noise equivalent absorption of 1.95 × 10 −8 W.cm −1 .Hz −1/2. The achieved performances of the sensor have enabled measurements on several air samples of a gas station showing a non-neglectable risk in case of long exposure.

Domaines: Instrumentations et Détecteurs [physics.ins-det]; Ingénierie de l'environnement; Optique / photonique

Diba Ayache, Wioletta Trzpil, Roman Rousseau, Kumar Kinjalk, Roland Teissier, et al.. Benzene sensing by Quartz Enhanced Photoacoustic Spectroscopy at 14.85 µm. Optics Express, 2022, 30 (4), pp.5531-5539. ⟨10.1364/oe.447197⟩. ⟨hal-03584679⟩