空间外差光谱仪干涉图非均匀性校正研究  

Study on Inhomogeneous Correction of Interference Pattern of Spatial Heterodyne Spectrometer

作　　者：王新强[1,2] 张丽娟[1,2] 熊伟[3] 张文涛[1,2] 叶松[1,2] 汪杰君[1,2] 

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]广西高校光电信息处理重点实验室,广西桂林541004 [3]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》2017年第4期1274-1278,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41201342);广西自然科学基金项目(2013GXNSFAA019328);广西教育厅项目(KY2015YB108);广西自动检测技术与仪器重点实验室基金项目(YQ14101;YQ14108;YQ15111);桂林电子科技大学创新团队项目资助

摘　　要：空间外差光谱仪在研制加工过程中,由于加工误差及胶合误差会使CCD接收到的干涉图存在光强分布不均匀现象,降低了变换光谱的准确性。基于对空间外差光谱仪干涉图光强非均匀性的产生机制与特点分析基础上,提出了一种干涉图非均匀性校正方法,该方法通过对实际干涉图进行单调分解、分段归一化及重新组合过程求解出光强分布函数,然后将变换光谱与光强分布函数倒数的傅里叶变换结果进行卷积来获得非均匀性校正后的光谱,最后将校正光谱进行逆傅里叶变换从而实现干涉图的非均匀性校正。将此方法应用于空间外差试验仪的近红外实测单色光干涉图的非均匀性校正,结果显示,该方法可以有效改善干涉图光强分布的非均匀性,抑制变换光谱的边频信号,通过与仿真的理想光谱对比,1 571和1 572nm光谱校正前后噪声的减小率分别达到40.7%和24%,提高了光谱信噪比和准确性。The intensity distribution is inhomogeneous in the interference pattern received with CCD because of the processing errors and agglutination errors produced during researching and processing of the spatial heterodyne spectrometer, which reduces the accuracy of the transform spectrum. An inhomogeneous correction method to interference pattern is proposed through analy- zing producing mechanism and characteristics of the inhomogeneity existed in interference pattern intensity of spatial heterodyne spectrometer. According to the method, actual interference pattern was decomposed monotonously, piecewise normalized and re- combined to solve light intensity distribution function; then the transform spectrum was convolved with Fourier transform result of the reverse light intensity distribution function to obtain inhomogenous correction spectrum~ lastly the inverse Fourier trans- form was implemented to corrected spectrum to realize inhomogenous correction of interference pattern. The correction method could be used in measured monochromatic interference pattern of near infrared light in spatial heterodyne spectrometer. The re- sults show that the method could effectively improve the homogeneity of interference pattern intensity distribution and inhibit edge frequency signal of transform spectrum. Compared with the simulated ideal spectrum, the noise in I 571 nm spectrum reduces 40.7% while the noise in 1 572 nm spectrum reduces 24% with signal to noise and accuracy of the spectrum being increased.

关 键 词：遥感 空间外差光谱仪 干涉图 非均匀性校正 

分 类 号：O433.4[机械工程—光学工程]