旋转抛物面的反射特性─—兼谈反射式太阳灶的设计改进

ON REFLECTIVE CHARACTERISTICS OF PARAEOLOIDAL MIRRORS──AN IMPROVEMENT ON THE DESIGN OF REFLECTIVE SOLAR COOKER

本文探讨了旋转抛物面的反射特性，指出了抛物面上任一点Ｐ的反射光锥与焦平面相截的截口曲线分别为圆、椭圆、抛物线、双曲线和两条相交直线。并根据焦平面上截线理论提出反射式太阳灶的灶型设计应重视两项改进措施。（１）增大收集角；（２）反射曲面选择。

Theoretical analysis of the reflective characteristics of paraboloidal mirrors has shown that the cross─section intercepted by the cone of light reflected from any point of the parabola with the focal plane would be respectively a circle,ellipse parabola,hyperbola or two cross lines.Based on the interception profile on the focal plane an inprovement on the design of reflective so- lar cooker is proposed:(1)to in increase the angle of collection;(2)to choose the reflective curve mirror properly.