傅里叶红外成像光谱仪中干扰现象的分析与消除

Analysis and Elimination of Interference in Fourier Infrared Imaging Spectrometer

针对傅里叶红外成像光谱数据中的一种干扰现象和消除方法进行了分析和研究。在傅里叶红外成像光谱仪中,在某些情况下会在光谱数据中出现一种尖锐凸起的干扰峰。该种干扰峰的峰位位置不固定,且幅度会发生较大的变化。从红外探测器、大气吸收特性、目标辐射特性、系统噪声等几个方面对该种现象的出现进行了分析。提出了该种现象出现的原因是由于红外探测器的灰度浮动造成的。针对该干扰现象的形成机理,提出通过噪声拟合法来消除这一干扰。经过实验验证,提出的方法可以有效地消除傅里叶红外成像光谱仪中的这种干扰峰,能有效提高傅里叶红外成像光谱仪的检测效果和抗干扰能力。

In this paper,an interference phenomenon and its elimination method in Fourier infrared imaging spectral data are analyzed and studied. In Fourier infrared imaging spectrometer,in some cases,a sharp convex interference peak appears in the spectral data. The peak position of this kind of interference peak is not fixed,and the amplitude will change greatly. The phenomenon from infrared detector,atmospheric absorption characteristics,target radiation characteristics,system noise and so on are analyzed. The reason for this phenomenon is the gray fluctuation of infrared detector. In view of the formation mechanism of the interference,the noise fitting method is proposed to eliminate the interference. The experimental results show that the proposed method can effectively eliminate the interference peak in Fourier infrared imaging spectrometer, and improve the detection effect and anti-interference ability of Fourier infrared imaging spectrometer.