汽车车灯线光源问题

The Vehicle Headlight Linear-lamp-house Problem

将汽车车灯 4mm长线光源视为连续均匀分布的点光源 ,运用物理光学中的非球面镜 (抛物面镜 )的性质 ,根据光学中有关点光源功率和光通量的关系以及有关点光源、光通量的计算公式和利用定积分计算出了线光源直射光源功率与反射光源功率的比值为 0 6 94 3,并应用几何光学知识画出了直射光线的亮区和反射光线的亮区 。

Vehicle headlight 4mm linear-lamp-house is looked as drop-lamp-house of continuous even-distribution. By using the character of physics optics in paraboloid-mirror and applying integral calculus, the authors obtain that the ratio between reflect-power and straight-power of vehicle headlight is 0.6943. Moreover, with the help of the knowledge of geometric optics, they draw out the bright- borough of straight-ray and reflect-ray, and have got the area of straight-ray and reflect-ray on the test-screen.