1. Benzene sensing by Quartz Enhanced Photoacoustic Spectroscopy at 14.85 µm
- Author
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Diba Ayache, Wioletta Trzpil, Roman Rousseau, Kumar Kinjalk, Roland Teissier, Alexei N. Baranov, Michael Bahriz, and Aurore Vicet
- Subjects
Atomic and Molecular Physics, and Optics - Abstract
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.
- Published
- 2022