如今，测量技术正在不断发展，用超声波技术来测量成为一种主要测量手段。超

如今，测量技术正在不断发展，用超声波技术来测量成为一种主要测量手段。超声波可以准确传播，消耗的能量很少，并且可以在空气中传播一定的距离，所以人们一般利用超声波来测量距离大小。超声波测量具有精度高、成本低、方便等特点，并且反应迅速、易于做到实时控制。因此在井深、液位、管道长度等的测量以及移动机器定位和躲避障碍这些方面得到许多的应用。<br>本设计由STC89C52单片机控制定时器，通过超声波传感器从发出超声波到接收的往返时间就能算出测量距离。然后将测到的值在LCD1602液晶显示出来，当距离小于设定值时，实时播放距离的语音来提醒使用人员注意安全。超声波的传播速度会因为温度的变化而发生变化，因此加入了一个温度传感器来测得实时温度，通过温度补偿来减小测量误差。

如今，测量技术正在不断发展，用超声波技术来测量成为一种主要测量手段。 超声波可以准确传播，消耗的能量很少，并且可以在空气中传播一定的距离，所以人们一般利用超声波来测量距离大小。 超声波测量具有精度高、成本低、方便等特点，并且反应迅速、易于做到实时控制。 因此在井深、液位、管道长度等的测量以及移动机器定位和躲避障碍这些方面得到许多的应用。<br>本设计由STC89C52单片机控制定时器，通过超声波传感器从发出超声波到接收的往返时间就能算出测量距离。 然后将测到的值在LCD1602液晶显示出来，当距离小于设定值时，实时播放距离的语音来提醒使用人员注意安全。 超声波的传播速度会因为温度的变化而发生变化，因此加入了一个温度传感器来测得实时温度，通过温度补偿来减小测量误差。

Nowadays, the measurement technology is developing continuously, using ultrasonic technology to measure becomes a main measurement method. Ultrasound can spread accurately, consume little energy, and can spread a certain distance in the air, so people usually use ultrasound to measure the distance. Ultrasonic measurement has the characteristics of high precision, low cost, convenience, and quick response, easy to achieve real-time control. Therefore, it has been widely used in the measurement of well depth, liquid level, pipeline length, mobile machine positioning and obstacle avoidance.<br>The timer is controlled by STC89C52 single chip microcomputer, and the measurement distance can be calculated by the round-trip time from sending ultrasonic to receiving ultrasonic sensor. Then the measured value will be displayed on LCD1602 LCD. When the distance is less than the set value, the voice of distance will be played in real time to remind users of safety. The propagation speed of ultrasonic will change with the change of temperature, so a temperature sensor is added to measure the real-time temperature, and the measurement error is reduced by temperature compensation.<br>