摘要
为了大气垂直探测仪能够进行精确的光谱测量,对其进行光谱定标。大气垂直探测仪使用面阵探测器,由于离轴像元接收的光线不平行于光轴,使仪器函数发生变化。本文针对大气垂直探测仪使用的16×4元面阵探测器理论分析给出仪器函数,讨论其对光谱定标的影响,并将利用理论分析结果及利用气体吸法测得的光谱,对大气垂直探测仪进行了光谱标定,光谱定标精度达10-5。采用面阵探测器的干涉仪,边缘视场像元所测光谱会向低频漂移,因此必需研究干涉仪的仪器函数,从而消除光谱漂移对边缘视场光谱定标的影响。
The Space-borne Fourier Transform Spectrometer （SBFTS） carried by FY-4 meteorology satellite is one of infrared remote sensing instruments, It acquires the temperature, pressure and humidity of atmosphere on geostationary orbit, and supplies the valuable weather data for next numerical weather prediction. For the proper use of the SBFTS, it is imperative to provide high quality spectral Calibration. The Instrument Line Shape （ILS） of Fourier transform spectroscopy is influenced by the angular distribution of light in the interferometer＇s off-axis detector. Analyze the effect on spectral calibration by off-axis detectors, and then make ILS simulation for rectangular detector based on the sounder＇s 16×4 plane array detectors structure. The result is used in the spectral calibration of the SBFTS. The precision of 10^-5 is achieved in the spectral calibration of SBFTS. Because of using focal plane array in Fourier transform spectrometer, the spectrum measured by the off-axis detector appears to shift to low frequency. The ILS of SBFTS must be analyzed for removing the effect of frequency shift in spectral calibration.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2008年第2期109-113,共5页
Opto-Electronic Engineering
基金
中科院创新基金(070725)
