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引言为了有效地排除背影杂散光的干扰,近代比较先进的光强测量常采用调制测量法,即先将待测光电讯号调制并转换为交变电讯号,然后进行放大、检测。我们将这一测量法引入普通物理实验,设计了一种简单的光源外调制光强测量系统,应用于光学实验中,取得了较好的效果。光强的调制测量普通的实验室用光源(白炽灯、钠光灯、氦氖激光等)是一种缓变光源,各种杂散光均可对它造成干扰。若首先对这种缓变讯号光加上一个较高频率的调制讯号,则缓变讯号就成了快变讯号,调制后讯号的包络反映了原始讯号。调制后的光经光电元件转换为具有较高频率的电讯号,再送入交流放
INTRODUCTION In order to effectively eliminate the interference of backscattered light, the more advanced light intensity measurement in modern times often adopts the modulation measurement method, that is, the optical signal to be measured is first modulated and converted into an alternating current signal, and then amplified and detected. We introduce this measurement method into ordinary physics experiments, and design a simple light source external modulation light intensity measurement system, which is used in optical experiments and has achieved good results. Modulation of light intensity measurement General laboratory light sources (incandescent, sodium light, He-Ne laser, etc.) is a slow light source, a variety of stray light can interfere with it. If we first add a higher frequency modulation signal to the slowly changing signal light, the slowly changing signal becomes the fast changing signal, and the envelope of the modulated signal reflects the original signal. Modulated light by optoelectronic components into a higher frequency of electrical signals, and then into the exchange