针对发光二极管(LED)光源的发光特点, 根据非成像光学的光学扩展量理论建立了获得均匀照明反射器的一般方程, 实现了在特定目标面上的均匀照明, 进而依据该方程设计了用于体视显微镜的LED照明系统。利用TracePro软件对所设计的系统进行光线追迹仿真, 结果表明在Φ90 mm的范围内照度均匀性达到90.6%, 不考虑反射率损失时能量利用率可达到99.6%。该设计方案采用单一反射器实现均匀照明, 为实现照明系统小型化和简单化提供了一种有效的途径。

In view of light-emitting diode (LED) light source’s characteristics, according to the étendue conservation theory in non-imaging optics, the improved reflection equations for obtaining uniform illumination are derived and the uniform illumination in specific target plane is achieved. Based on the equations, an illumination system of LED-base stereomicroscope is designed. Using software Tracepro, the ray-tracing simulations show that, in the scope of Φ90 mm, the uniformity of illumination reaches 90.6%, and the efficiency can reach 99.6% without considering the loss. This scheme uses only one single reflector to achieve uniform illumination and provides an effective way for realizing system’s miniaturization and simplification.