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一、测量原理图1表示光电式转速表的测量原理。从小灯泡来的光通过半透明镜后转折90°再通过凸透镜聚集在旋转体上。由于旋转体上贴有反射条而使反射光作平行于入射光反射,所以反射光再次通过凸透镜,一部分到达光敏晶体管。光敏晶体管接收的信号经过放大整形后变为脉冲波。
First, the measurement principle Figure 1 shows the photoelectric tachometer measurement principle. Light from the small bulb through the semi-transparent mirror turned 90 ° and then gathered through the convex lens on the rotating body. Since the reflecting body is attached to the rotating body so that the reflected light is reflected parallel to the incident light, the reflected light passes through the convex lens again and reaches a part of the phototransistor. Phototransistor receives the signal after amplification and shaping into a pulse wave.