采用小波变换的空间外差光谱仪基线校正  

Baseline correction of spatial heterodyne spectrometer using wavelet transform

作　　者：叶松[1,2] 甘永莹 熊伟[3] 张文涛[1,2] 汪杰君[1,2] 王新强[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：《红外与激光工程》2016年第11期202-206,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(41201342;41561079);广西自然科学基金(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(YQ14101;YQ14115;YQ15111);桂林电子科技大学创新团队项目

摘　　要：空间外差光谱技术是应用于天文测量以及大气遥感等方面的一种超光谱分析技术。为消除应用过程中的基线漂移,提出了改进的小波变换进行基线校正的方法。通过对不同小波函数以及分解层数对基线校正结果影响的分析,对原始光谱信号进行小波分解得到细节系数和逼近系数,将逼近系数置零以实现光谱信号的重构,从而实现干涉图的基线校正。最后将小波校正结果与阈值拟合校正结果进行对比。结果显示:两种方法校正光谱的相关系数为0.999 9,结果一致,但小波变换的程序运算耗时缩短10余倍。说明利用小波变换进行空间外差干涉图基线校正是一种行之有效、省时、简便的方法。Spatial heterodyne spectroscopy （SHS） is a new spectroscopic technique which applies to astrometry and atmospheric remote sensing. A method of using wavelet transform to correct the baseline was proposed to eliminate the baseline drift during its application. Through the analysis of the influences of the different wavelet functions and decomposition layers on the results of baseline correction, the original spectrum was decomposed by wavelet transforms to get detail coefficients and approximate coefficients, and set the approximate coefficients to zero, the spectrum was reconstituted to realize the baseline correction. In the end, the results were compared with the results of the threshold fitting correction. The results show that the correlation coefficient of the two methods is 0.999 9 and the results are consistent, but the method of wavelet transform is more than ten times the time of the procedure. It is proved that using wavelet transform to carry out the baseline correction of spatial heterodyne interferometry is an effective, time saving and convenient method.

关 键 词：空间外差光谱仪 干涉图 小波变换 基线校正 

分 类 号：O433.4[机械工程—光学工程]