Optical Gas Sensing and Applications

Dear Colleagues,

The principle of optical gas sensing technology is to use the absorption, scattering and transmission characteristics of light to convert gas concentration into photoelectric signal so as to achieve the measurement of gas concentration information. Laser absorption spectroscopy, such as tunable diode laser absorption spectroscopy (TDLAS), Fourier transform spectroscopy (FTS), and dual-comb spectroscopy (DCS), etc., has demonstrated its powerful capabilities for quantitative gas analysis due to its high sensitivity, high selectivity, real-time use and non-invasive characteristics. There are a variety of different spectral techniques employed for trace gas detection, including direct absorption spectroscopy (DAS), wavelength modulation spectroscopy (WMS), photoacoustic spectroscopy (PAS), cavity ring-down spectroscopy (CRDS), cavity enhanced absorption spectroscopy (CEAS), and differential optical absorption spectroscopy (DOAS), etc. These spectral techniques have different advantages so as to be used in different application scenarios. We strongly encourage the development of state-of-the-art spectrometers and applying them to different scenarios including atmospheric chemistry, soil ecology, industrial process, combustion diagnosis and other gas sensing fields. Only if we can measure the concentration of these trace species and evaluate their natural or anthropogenic source and sinks can we propose appropriate strategies for atmospheric environmental governance and sustainability. This Special Issue will provide a collection of the latest technical solutions and application findings of optical gas sensors in the fields of environment/health, industrial control, energy exploration, biomedicine, etc.

Prof. Dr. Jingsong Li
Dr. Linguang Xu
Dr. Ningwu Liu
Guest Editors

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