基于AT89C52的手持式激光超声测距仪，通过启动发送超声脉冲串开始计时，接收回波结束计时，同时测量周围环境温度，利用测得的温度进行修正声音在空气中传播的速度，该速度乘上传播时间除2即得到障碍物的距离。-AT89C52-based hand-held laser ultrasonic range finder, ultrasonic pulse through the string to start sending start time, receiving echo the end of time, simultaneous measurement of ambient temperature, using the measured temperature of amendments to the transmission of sound in air speed, the speed by spread their time, two obstacles that get away.