Zhou Hai-Jin, Liu Wen-Qing, Si Fu-Qi, Zhao Min-Jie, Jiang Yu, Xue Hui
Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Nov;32(11):2881-5.
Space-borne differential optical absorption spectrometer is used for remote sensing of atmospheric trace gas global distribution. This instrument acquires high accuracy UV/Vis radiation scattered or reflected by air or earth surface, and can monitor distribution and variation of trace gases based on differential optical absorption spectrum algorithm. Spectral calibration is the premise and base of quantification of remote sensing data of the instrument, and the precision of calibration directly decides the level of development and application of the instrument. Considering the characteristic of large field, wide wavelength range, high spatial and spectral resolution of the space-borne differential optical absorption spectrometer, a spectral calibration method is presented, a calibration device was built, the equation of spectral calibration was calculated through peak searching and regression analysis, and finally the full field spectral calibration of the instrument was realized. The precision of spectral calibration was verified with Fraunhofer lines of solar light.
星载差分光学吸收光谱仪用于大气痕量气体全球分布的遥感监测。该仪器获取由空气或地球表面散射或反射的高精度紫外/可见辐射，并能基于差分光学吸收光谱算法监测痕量气体的分布和变化。光谱校准是该仪器遥感数据定量的前提和基础，校准精度直接决定仪器的发展和应用水平。考虑到星载差分光学吸收光谱仪视场大、波长范围宽、空间和光谱分辨率高的特点，提出了一种光谱校准方法，搭建了校准装置，通过寻峰和回归分析计算出光谱校准方程，最终实现了仪器的全场光谱校准。利用太阳光的夫琅禾费线对光谱校准精度进行了验证。
