Original Articles
Hong Wei Peng, Yu Jie Cheng, Z
Abstract
This document presents the principle of ultrasonic distance measurement is described, the main error sources of ultrasonic distance measurement are analyzed also. A method of improving precision of ultrasonic distance measurement in air, in which the transmission speed of ultrasonic wave if corrected by measured air temperature and the forward edge of receive wave can be determined accurately by use of the receive wave feedback—time method with the software. Based on the idea, the circuit and software of ultrasonic distance measurement system have been designed to apply digital signal processing technology. Experiment indicates that the measuring precision of ultrasonic distance measurement system is higher and its circuit is simpler.