Wavelength modulation photoacoustic spectroscopy using a near-infrared DFB diode laser

Qi Huang; Wangxuan Zhao; Sheng Zhou; Jingsong Li

doi:10.1117/12.2564712

17 April 2020 Wavelength modulation photoacoustic spectroscopy using a near-infrared DFB diode laser

Qi Huang, Wangxuan Zhao, Sheng Zhou, Jingsong Li

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 114553S (2020) https://doi.org/10.1117/12.2564712
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

Photoacoustic spectroscopy (PAS) has been a powerful tool in terms of sensitivity, selectivity and simplicity. In this paper, a resonant PAS sensor system based on a distributed feed-back (DFB) diode laser near 1653 nm for methane (CH₄) detection is introduced. Wavelength modulation spectroscopy (WMS) with second harmonic (2f) method is combined with the PAS detection strategy for further sensitivity improvement. A PA cell working in the second-order longitudinal resonant mode was fabricated and used for experimental test of CH₄spectroscopy measurement. Photoacoustic signal dependence on gas pressure and modulation parameters were studied to optimize the sensor performance. In addition, potential approaches and detection schemes on improving sensor performance are also discussed.

Citation Download Citation

Qi Huang, Wangxuan Zhao, Sheng Zhou, and Jingsong Li "Wavelength modulation photoacoustic spectroscopy using a near-infrared DFB diode laser", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 114553S (17 April 2020); https://doi.org/10.1117/12.2564712

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