Application Progress of Cavity-Enhanced Absorption Spectroscopy (CEAS) in Atmospheric Environment Research
CHEN Dong-yang1, ZHOU Li1*, YANG Fu-mo1, WANG Wei-gang2, GE Mao-fa2
1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China
2. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Abstract：Atmospheric pollution is a global environmental problem, and the development of detection technology for atmospheric environmental pollutants is crucial to atmospheric environmental research. Spectral analysis methods have been widely used in atmospheric pollutant detection because of their specific selection, high accuracy, and high time resolution. Cavity-enhanced absorption spectroscopy (CEAS) is developed from cavity ring-down spectroscopy (CRDS). A high-sensitivity detection technique obtains molecular absorption information by measuring the light intensity through a high-definition resonant cavity. In the past two decades since its introduction, this technology has become an important method for trace gas detection in atmospheric environment research because of its advantages such as low cost, simple operation, high sensitivity, and strong adaptability. This paper introduces the two CEAS technology principles and basic device structure based on coherent and incoherent light sources. Among them, incoherent broadband cavity absorption-enhanced absorption spectroscopy (IBBCEAS) technology mainly uses LED and short-arc xenon lamps as light sources, which has lower cost and can detect the spectral range of tens of nanometers, so it is more widely used in atmospheric research. This paper reviews the application of CEAS technology developed by domestic and foreign research groups detecting nitrogen oxides (NO2, NO3, N2O5, HONO), volatile organic gases (formaldehyde, glyoxal, methylglyoxal, methane, ethylene), halogen elements (I2, Br2), halogen oxides (OIO, IO, BrO), ozone (O3), aerosol and other pollutants. Meanwhile, in thiswork, we summarized the improvement and optimization of CEAS sensitivity from the aspects of the light source, detector, optical cavity structure. This paper focuses on CEAS detection ability not only under laboratory conditions but also in field campaigns. Finally, some prospects are made from the aspects of system optimization and the future application trend of CEAS technology.
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