The reporter learned from the Hefei Institute of Physical Science of the Chinese Academy of Sciences that the research team of Xiong Wei of the Anhui Institute of Optics and Mechanics studies the high-spectral detection technology of OH radicals in the middle and upper atmospheres to improve the level of China's atmospheric environmental stereo detection technology and grasp global climate change. , It is of great significance to improve the level of meteorological and climatic observations, and to master the information of the atmospheric environment. Related research work is based on the 'super-resolution spatial heterodyne of OH radicals in the middle and upper atmospheres. spectrometer The title was published as a cover article in the Journal of Optics.
At present, the role of OH radicals in the upper and middle atmosphere on the Earth is not yet clear in the atmospheric physical and chemical processes, global climate change, atmospheric ozone levels, and acid deposition and other major environmental problems. It is urgent to strengthen the research. Atmospheric parameters OH radicals As an 'oxidant', it is of great significance for humans to understand the chemical composition of the middle layer, especially the destruction of the ozone layer, and the water vapor concentration at the top of the middle layer is inversion. Combining one-dimensional field of view imaging technology with spatial heterodyne interference spectroscopy, Using two-dimensional orthogonal observation mode, it is expected to achieve three-dimensional tomographic detection of the number density of OH radicals in the middle and upper atmospheres.
Hyperspectral atmospheric tomography technology is not only the problem of weak signal OH radical detection capability, but also involves methods for obtaining atmospheric spatial 3D data, and the working modes associated with information inversion, etc., need to undergo in-depth research and experimental verification. Therefore, it is very necessary for the system to solve the detection theory, technology and application problems involved.
The research team Luo Haiyan, associate researcher, etc., began designing the orthogonal tomographic spatial resolution heterodyne spectrometer scheme in 2013, combined with high-sensitivity UV weak light CCD detection technology and UV band calibration technology methods, OH radical inversion methods, etc. Research work, for the first time, the development of spectrometers better than 0.008 nanometer spectral resolution.
On this basis, the researchers completed direct sun-based and scattered-spectrum detection experiments as well as aviation flight tests to achieve a very high spectral detection capability of the spectrometer for different areas and different observational geometrical atmospheric scattering signals, and for the middle and upper atmospheres of the satellite The realization of OH radical chromatography detection system provides an effective and feasible technical solution.
