Articles | Volume 12, issue 3
Atmos. Meas. Tech., 12, 1905–1911, 2019
https://doi.org/10.5194/amt-12-1905-2019

Special issue: Advances in cavity-based techniques for measurements of atmospheric...

Atmos. Meas. Tech., 12, 1905–1911, 2019
https://doi.org/10.5194/amt-12-1905-2019

Research article 25 Mar 2019

Research article | 25 Mar 2019

Cavity-enhanced photoacoustic sensor based on a whispering-gallery-mode diode laser

Yufeng Pan et al.

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Latest update: 07 Dec 2021
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Short summary
Photoacoustic spectroscopy has one important advantage: its sensitivity is proportional to the excitation light power and thus the performance of PAS-based sensors can benefit from a high excitation light power. We developed a cavity-enhanced photoacoustic sensor in which a photoacoustic cell was placed into a high-finesse optical cavity. A signal gain factor of 166 was observed. For C2H2 detection, a 1σ detection limit of 0.45 ppmV was obtained at atmospheric pressure with a 1 s averaging time.