本设计的速度测量主要是测量转轴的角速 度，利用角速度和线速度的转换关系转换为线速度，从而测量出物体的行进速度。角速度的测量利用红外光发射和探测而测出转轴的角速度，利用单片机的处理并用七段数码管输出速度值。如果速度超过指定值时，蜂鸣器发出响声提示。-The design speed of measurement used to measure the shaft angular velocity, angular velocity and linear velocity using the conversion relations into line speed, which measure the speed of moving objects. Angular velocity measurement using infrared light emission and detection of the rotor angular velocity measured using the SCM process and the speed with seven-segment digital tube output values. If the speed is more than a specified value, the buzzer sound prompts.