In order to enhance the ultrasonic wave distance gauge the measuring precision

the principle of range finder by using ultrasonic wave phase difference is introduced.A novel range finder is proposed using ultrasonic wave phase difference is introduced.This technology uses the monolithic integrated circuit to complete the ultrasonic wave

the production and the launch

the range finder result is obtained using the counter and the phase comparator.Through real-time measurement of ambient temperature

ultrasonic propagation speed is revised;and the ultrasonic ranging system precision is increased.Hardware and software design of this range finder detecting system are completed

and the detail study on theory and the experiment are carried on.The experimental results show that the proposed design method has high precision

good duplication

high reliability

and good application prospect.