大工作距红外变焦显微光学系统设计

Optical Design of Infrared Zoom Microscope System with Long Working Distance

红外显微热成像系统能够分析微小物体或局部细节的温度变化,在工业检测、医学诊断和科学实验研究等领域已获得广泛的应用。分析了红外变焦显微光学系统的设计方法,并基于制冷型红外探测器设计了一款成像倍率为0.5×~2×的光学系统。该系统采用机械补偿变焦方式,以二次成像构型实现与探测器冷光阑的光瞳匹配,在8片镜片上设计了2个非球面,矫正了高级像差,实现了在全倍率范围内的平滑连续变焦。通过zemax宏程序对变焦过程的分析表明,该光学系统在整个变焦过程中运动平滑,成像稳定,弥散斑变化均较小。

Infrared thermal microscope imaging system can be used to analyze the temperature changes of tiny objects or the local details, which has been widely used in industrial detection, medical diagnosis, scientific experimental research and other fields. The design method of the infrared zoom microscope optical system is analyzed, and an optical system with an imaging magnification of 0.5 ×~2 × is designed based on the refrigeration infrared detector. Mechanical compensation zoom is used in the system. The cooling diaphragm of the detector is matched with the pupil of the optical system by the secondary imaging configuration. The higher-order aberration is corrected by the two aspherical surfaces on eight lenses. And the smooth and continuous zoom in the full magnification range is realized. Through the analysis of zooming process by ZEMAX macro program, the optical system is designed with smooth movement, stable imaging and small change of dispersion spots during the whole zooming process.