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Title: A New Ultrasonic Range-Measuring System
Author: C. F. Huang, K.N. Huang, m. S. Young
Source: 2001 Measurement Science Conference
Year Published: 2001
Abstract: - A multiple-frequency continuous wave ultrasonic range-measuring system (MFCW) for use in air is described. This MFCW system successfully takes into account the finite bandwidth of conventional inexpensive transducers. Because the system is based on the detection of phase difference, the traditional acoustic attenu- ation problems of which have limited by time-of-flight methods are avoided. Such a ranging system utilizing three different ultrasonic frequencies, generating three corresponding different phase shifts, is used in this paper to calculate target distances. The MFCW method is relatively easy to be implemented with inexpensive ultrasonic transducers, a single-chip microcomputer, a temperature sensor and an LCD for robotic control. Measurement error is very low and practical range is far superior to competitive current systems.

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