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[China Instrumentation Network: Advances in Instrument Development] Recently, the research team led by Zhang Weijun at Anguang Institute has made significant progress in the detection of aerosol spectral characteristics. Their latest achievement is a three-wavelength cavity-enhanced albedometer designed to measure wavelength-dependent optical properties and single-scattering albedo. The findings were recently published in *Optics Express*, a prestigious journal by the Optical Society of America (OSA).
The spectral properties of aerosols are closely tied to their chemical composition, size distribution, and mixing state, which help identify the type and source of the particles. However, current aerosol optical measurement systems often rely on single-wavelength and single-parameter methods, making it challenging to conduct online, simultaneous measurements of multiple optical parameters. As a result, systems capable of measuring aerosol spectral characteristics remain rare.
In 2014, researchers Zhao Weixiong and Dr. Xu Xuezhe pioneered the integration of broadband cavity-enhanced absorption spectroscopy with integrating sphere technology, creating the world’s first cavity-enhanced albedo spectrometer. This system enabled the measurement of extinction, scattering, and absorption coefficients of atmospheric aerosols, as well as the online in-situ determination of the single-scattering albedo. Their work was published in *Atmospheric Measurement Techniques* (7(8), 2551–2566, 2014).
Building on this success, the team extended the detection range of the system into the ultraviolet-red spectrum, developing a wide-band cavity-enhanced albedo spectroscopy system. This advancement allows for comprehensive spectral measurements of various aerosol optical parameters. The system has been deployed in atmospheric observations across key regions such as the Beijing-Tianjin-Hebei, Yangtze River Delta, and Pearl River Delta, demonstrating strong potential for both research and practical applications. The results have been widely recognized by domestic and international experts and have been published in top journals like *Atmospheric Chemistry and Physics* (16(10), 6421–6439, 2016; 18(23), 16829–16844, 2018).
This groundbreaking research was supported by several funding bodies, including the National Natural Science Foundation of China, the Anhui Outstanding Youth Science Fund, and the Chinese Academy of Sciences Youth Innovation Promotion Association.
(Original title: *Anguang's New Progress in the Detection of Aerosol Spectral Properties*)