空间外差光谱仪相位校正方法的研究  

Study on Phase Correction Method of Spatial Heterodyne Spectrometer

作　　者：王新强[1] 叶松[1] 张丽娟[1] 熊伟[2] 

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西桂林541004 [2]中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室,安徽合肥230031

出　　处：《光谱学与光谱分析》2013年第5期1424-1428,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41201342);中国科学院通用光学定标与表征技术重点实验室研究项目资助

摘　　要：空间外差光谱仪在应用的过程中由于各种测量原因使采集的干涉图存在相位误差。对此提出了一种改进的相位校正方法,该方法在提取单边变换光谱进行傅里叶逆变换求取干涉图相位曲线的基础上,通过拟合相位斜率求出相位误差,然后计算相位校正函数,将变换光谱与相位校正函数进行卷积来实现光谱相位校正。把该方法应用于实测单色谱与仿真水汽光谱的相位校正,实验结果显示该方法能有效的去除单色光谱边缘的低频假信号,提高干涉图的周期性和对称性;对于叠加了相位误差的连续光谱,使其校正前后的光谱与原光谱的标准偏差由0.47降为0.20,提高了光谱的准确性。Phase distortion exists in collected interferogram because of a variety of measure reasons when spatial heterodyne spec- trometers are used in practice. So an improved phase correction method is presented. The phase curve of interferogram was ob- tained through Fourier inverse transform to extract single side transform spectrum, based on which, the phase distortions were attained by fitting phase slope, so were the phase correction functions, and the convolution was processed between transform spectrum and phase correction function to implement spectrum phase correction. The method was applied to phase correction of actually measured monochromatic spectrum and emulational water vapor spectrum. Experimental results show that the low-fre- quency false signals in monochromatic spectrum fringe would be eliminated effectively to increase the periodicity and the symme- try of interferogram, in addition when the continuous spectrum imposed phase error was corrected, the standard deviation be- tween it and the original spectrum would be reduced form 0. 47 to 0. 20, and thus the accuracy of spectrum could be improved.

关 键 词：遥感 空间外差光谱仪 干涉图 相位校正 

分 类 号：O433.4[机械工程—光学工程]