设计一种工作波段可切换，曝光时间从0.1 s～99.9 s可控，操作方便的折转式1∶1成像系统，通过转向棱镜连接前后镜组，替换不同厚度的滤色片以实现双波段成像。该系统将高分辨率折转式1∶1成像镜头与电子快门结合，光学系统视场范围φ17 mm，分辨率达到8 μm，工作距离55 mm，系统用转向棱镜折转90°成像，克服了一般镜头本身不能控制曝光时间的缺点，使曝光时间和光的导向能够精确控制，改善了化学发光免疫分析的试验条件，有望在临床中的化学发光免疫分析，以及环境科学、光化学等领域得到应用。

A folding 1∶1 imaging system with switchable waveband and controllable exposure time of 0.1 s～99.9 s was designed. In this system, the front and rear lens groups were connected through a deflection prism, the color filter was changed to achieve dual-band imaging, and the high resolution folding lens was coupled with electronic shutter to control the exposure time. The field of view of the optical system was φ17 mm, the resolution was enhanced to 8 μm，and the working distance reached 55 mm. The results showed that the exposure time and the direction of light could be accurately controlled. The optical system is flexible, cost-efficient and can be adapted to different lenses according to different requirements in chemiluminescence immunoassay, environmental science and photochemistry.