Title :
Accurate distance measurement by an autonomous ultrasonic system combining time-of-flight and phase-shift methods
Author :
Gueuning, Francis E. ; Varlan, Mihai ; Eugne, C.E. ; Dupuis, Pascal
Author_Institution :
Lab. for Electron. Instrum., Katholieke Univ., Leuven, Belgium
fDate :
12/1/1997 12:00:00 AM
Abstract :
This paper presents an efficient algorithm for distance measurement, combining both the pulse time-of-flight method and the CW phase-shift method, It copes with a low-rate sampling technique allowed by the limited bandwidth of two ultrasonic transducers working in air at 30 kHz and with modest software resources of autonomous devices. The measuring system was implemented and tested on a compact Motorola MC68HC16-based platform, with a minimum of attached hardware. Experimental results show an accuracy better than 1 mm for a poor reflecting target at a distance of about 1 m
Keywords :
acoustic correlation; acoustic signal detection; acoustic signal processing; computerised instrumentation; distance measurement; parameter estimation; ultrasonic applications; 1 m; 30 kHz; CW phase-shift method; Motorola MC68HC16-based platform; autonomous ultrasonic system; distance measurement; efficient algorithm; low-rate sampling; phase-shift methods; pulse time-of-flight method; reflecting target data analysis; software resources; time-of-flight method; ultrasonic transducers; Acoustic devices; Acoustic measurements; Bandwidth; Delay estimation; Distance measurement; Hardware; Pulse measurements; Signal processing algorithms; Ultrasonic transducers; Ultrasonic variables measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
