A non-contact height measuring instrument using ultrasonic technology is designed.This system takes MCU as controller

designs the ultrasonic transmitting and receiving circuit

completes the host computer communication.Measurement and monitoring is carried out in VB environments by computer

completes the design of temperature compensation circuit

and completes corresponding software program.The experimental results show that the instrument has simple facilities

the high precision and high reliability.It can be better applied to non-contact height measurement.