AOTF成像光谱仪光学系统的最优方案选择

基于声光可调谐滤波器（AOTF）的成像光谱仪是一种新型的成像光谱仪，它除了具有一般成像光谱仪的二维空间信息与一维光谱信息外，还能获得目标的偏振信息。在实际应用中AOTF可接收的光束孔径角一般不大于5～6，因而受到所采用声光晶体可接收角度的限制，AOTF光谱成像仪的光学系统不能同时兼顾大孔径与大视场。要求AOTF成像光谱仪视场满足128128像元，TeO2晶体尺寸为10 mm10 mm，根据声光可调谐滤波器成像光谱仪光学系统的特点，分析比较了2种光学系统总体方案，最终将系统的孔径光栏放置在晶体上，TeO2晶体尺寸限制了孔径光栏的尺寸，晶体可接收的角度决定了系统的视场角，提高了能量利用率，获得较高的图像信噪比。

Optimal scheme of AOTF imaging spectrometer optical system

Compared with the traditional spectral imaging instruments, an acousto-optic tunable filter is a new type of imaging spectrometer, which can obtain target polarization spectrometer and two-dimensional spatial information. However, AOTF can only receive the beam with angle less than 5°～6° in the practical application. Because of the limited receiving angle, AOTF spectral imager optical system can not achieve the large aperture and large field of view at the same time. We developed the AOTF imaging spectrometer field of view to meet the requirements of 128×128 pixels and the TeO2 crystal size of 10mm×10mm. Based on the features of the acousto-optic tunable filter imaging spectrometer optical system, an optimal system design was determined, the aperture stop was placed in the crystal, aperture stop size was limited by TeO2 crystal size, and the system field of view was determined by the crystal. The energy utilization ratio is improved and the signal to noise ratio of the image is increased.