随着光谱成像技术的发展, 以高空间分辨率和高光谱分辨率获得的图像极大地提高了地物目标的识别能力, 为准确获取地物被测目标的二维空间影像信息和一维光谱信息, 设计完成一种基于声光可调滤波器(AOTF)的高光谱成像系统, 但由于系统中偏振片消光比有限, 导致视场外的0级光与被测目标的+1级衍射光发生重叠, 而AOTF无驱动时成像可近似为0级干扰的图像, 为此提出一种AOTF加驱动图像减无驱动图像的0级干扰抑制方法。 并采用该系统样机进行外场光谱成像实验, 对结果进行0级干扰抑制方法修正, 修正后的结果表明该方法不仅大幅度消除了0级光的干扰, 而且还提高了整个成像光谱的测量精度。

With the development of spectral imaging technology, the images with high spatial resolution and high spectral resolution acquired greatly improves the recognition ability of ground objects. In order to quickly and accurately obtain the 2D spatial image information and the 1D spectral information of the targets, a hyperspectral imaging system based on an acoustic optic tunable filter (AOTF) was designed. Due to the limitation of the polarizer extinction ratio, the 0 level light outside the field overlapped with the +1 diffraction of the measured target, and the image could be an image with 0 level interference approximately when the AOTF was not driven. In this paper, a method of 0 level interference suppression for AOTF adding driven imaging and removing AOTF no driven imaging was proposed, and the system prototype was used to carry out the field spectral imaging experiment. The results were modified by interference suppression method of 0 levels. The experimental correction results indicated that this method not only greatly eliminated the interference of the 0 level, but also improved the measurement accuracy of the imaging spectrum.