ACCURATE DISPLACEMENT MEASUREMENT BASED ON THE FREQUENCY VARIATION MONITORING OF ULTRASONIC SIGNALS

Ch. Papageorgiou, Th. Laopoulos

Abstract

This paper introduces a different approach to the measurement of the time-of-flight of ultrasonic signals. Frequency variation monitoring and recording is used to determine accurately the arrival time of the ultrasonic signal. A high speed Digital Signal Processor (D.S.P.) is used for both: transmission and direct measurement of the frequency of the incoming signal in every single period and with an accuracy of about 0.1%. The proposed configuration offers small size and low cost solution to displacement measurements with a remarkable performance in terms of accuracy, range and measurement time.

Keywords

ultrasonic transducers, frequency variation, displacement measurement

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PWC-2003-TC14-020.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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