Benzene sensing by Quartz Enhanced Photoacoustic Spectroscopy at 14.85 µm

  • Ayache D
  • Trzpil W
  • Rousseau R
  • et al.
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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.

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Ayache, D., Trzpil, W., Rousseau, R., Kinjalk, K., Teissier, R., Baranov, A. N., … Vicet, A. (2022). Benzene sensing by Quartz Enhanced Photoacoustic Spectroscopy at 14.85 µm. Optics Express, 30(4), 5531. https://doi.org/10.1364/oe.447197

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