摘要
针对目前利用光电效应测定普朗克常数的实验装置的不足,提出一种采用LED光源的实验装置。该装置采用谐振腔发光二极管(RCLED)作为单色光源,该光源单色性好,波长稳定,寿命长,驱动简单,不需预热,采用脉冲宽度调制(PWM)方式调节亮度准确方便,从而可以方便准确地验证光电效应实验规律及测定普朗克常数。测试结果表明:本实验装置测得数据比目前实验室采用高压汞灯作为光源的实验装置测得数据更准确。
An experimental device adopting LED light source for measuring the Planck constant based on photoelectric effect has been proposed to improve the defect of the present device. The device adopts the resonant cavity light emitting diode （RCLED） as a monochromatic light source, because the performance of the monochromatic light source is good and the stability of wavelength is high. The LED light source needs not preheating and has a long service life. The brightness can be adjusted by the pulse width modulation （PWM） method accurately. Therefore, the experimental laws of the photoelectric effect can be verified and the Planck constant can be measured conveniently and accurately. The test results show that the proposed device get more accurate data than those using high pressure mercury lamp as light source commonly used in present laboratory do.
出处
《光学仪器》
2014年第4期356-358,363,共4页
Optical Instruments
基金
郑州市重点建设实验室(电子信息技术实验室)(郑教高[2013]109号)
关键词
LED光源
光电效应
实验装置
LED light source
photoelectric effect
experimental device
