High sensitive detection of atmospheric methane using infrared laser absorption spectroscopy

Jian Sang; Xiaoyun Yang; Tianbo He; Jingsong Li

doi:10.1117/12.2531687

17 May 2019 High sensitive detection of atmospheric methane using infrared laser absorption spectroscopy

Jian Sang, Xiaoyun Yang, Tianbo He, Jingsong Li

Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 111700C (2019) https://doi.org/10.1117/12.2531687
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China

Abstract

Methane (CH₄), a key greenhouse by influencing tropospheric ozone (O3) and stratospheric water vapor (H₂O), plays an important role on the process of global warming and climate change. In this paper, we report on the development of a gas sensing technique based on high sensitive tunable diode laser absorption spectroscopy (TDLAS). A room-temperature distributed-feedback (DFB) diode laser near 1653 nm is used to excite the rotational-vibrational absorption line of CH₄ molecule. Direct absorption spectroscopy and wavelength modulation spectroscopy were used for investigating methane molecular line parameters and sensing gas concentration, respectively. Moreover, potential strategies for sensitivity improvement are also discussed.

Citation Download Citation

Jian Sang, Xiaoyun Yang, Tianbo He, and Jingsong Li "High sensitive detection of atmospheric methane using infrared laser absorption spectroscopy", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111700C (17 May 2019); https://doi.org/10.1117/12.2531687

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