连续变焦偏振视频显微物镜设计

Optical design of continuous zoom polarization video microscope

针对传统显微镜在低照度环境时成像对比度低、识别难度大等问题,提出结合分焦平面偏振成像技术,设计了一款含三个移动组的五组元连续变焦偏振视频显微物镜。该物镜工作在可见光波段,变倍范围为1×-6.5×,物方线视场1.70~11.1 mm,全长220 mm,工作距离为22 mm,后截距为14 mm,后接偏振探测器获得目标的偏振信息。经仿真分析,该系统在变焦范围内像面稳定,在各个变焦状态下成像质量接近衍射极限。该系统不仅可以在显示屏上获得目标的不同放大倍率的像,缓解视疲劳,还可以获得目标的偏振信息,提高目标的识别概率、观察效率和低照度情况下的成像效果。

Aiming at the problems of low imaging contrast and difficult recognition of traditional microscopes in low-illuminance environments,a continuous zoom polarization video microscope objective in combination was designed with division-of-focal-plane polarization imaging technique.The objective lens worked in the visible light band,with a zoom range of 1×-6.5×,an object-line field of view of 1.70-11.1 mm,a total length of 220 mm,a working distance of 22 mm,and image distance of 14 mm.And the system was followed by a polarization detector to obtain the target’s polarization information.After simulation analysis,the image plane was stable in the zoom range,and the imaging quality was close to the diffraction limit in each zoom state.The system can not only obtain images of different magnifications of the target on the electronic display and alleviate visual fatigue,but also obtain the polarization information of the target,improve the recognition probability of the target,the observation efficiency and the imaging quality in the case of low illumination.