雾灯穿透能力最佳波长的实验确定

黄光用作雾灯是由于相对其他色光灯其穿透能力较强的缘故，但黄光的波长范围约有15nm。介绍了人工造雾方法，说明了干冰不适合于人工造雾的理由。讨论了实验中光波长范围的一些选择因素，详细介绍了实验装置，特别强调了实验装置中的6个要点：即光源的辐射功率要大；单色仪的出入射狭缝要合理且两者宽度应调成一致；会聚透镜的焦距要大；加湿器最后出口的孔必须是方的；真空泵和雾气收集罩的作用；微机控制单色仪波长鼓及测量信号的自动记录。得出LED在用作雾灯时的最佳波长为578nm。

Determination of optimum penetration wavelength for fog lights

The reason of using yellow lights as fog lights is that it has better penetration power than any other single color lights. The wavelength range of yellow light is about 15nm. A method to generate man-made fog is presented. The reason that dry ice is not suitable for making the man-made fog is described. The factors for selecting the wavelength ranges to be measured are considered. The experiment equipment is introduced, with six key issues stressed, radiant power of light source should be higher, width of the I/O slits of the monochromator should be reasonable and both of them should be adjusted to an equal width, the focal length of the convergent lens should be longer, the exit of humidistat should be square, the function of vacuum pump and fog collecting hood is important, and the wavelength adjustment of the monochromator and the auto-record of the measuring signal should be controlled by a micro-computer. It is found that the optimal wavelength of LED taken as fog lights is 578nm.