Method and apparatus for measuring the propagation time of a signal, in particular a ultrasonic signal
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United States of America Patent
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Jan 11, 2005
Grant Date -
N/A
app pub date -
Oct 8, 2002
filing date -
Mar 3, 1999
priority date (Note) -
Expired
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Abstract
Propagation time T.sub.p of an ultrasound signal between two spaced-apart transducers constituting an emitter and a receiver is measured. The emitter transducer is subjected to an excitation signal of n successive pulses of period T.sub.e giving rise to an ultrasound signal being emitted towards the receiver transducer which receives the ultrasound signal generating and outputting a receive signal. A measurement of an intermediate propagation time T.sub.int is started when the emitter transducer begins to be excited. The receive signal is detected and the oscillations in the receive signal are counted. Measurement of the intermediate propagation time T.sub.int is stopped when an i.sup.th oscillation is detected. The propagation time T.sub.p is determined by taking the difference T.sub.int -i.times.T.sub.e. Advantageously, measurement of T.sub.int is stopped for an i.sup.th oscillation of the receive signal that corresponds to the receive signal being at a maximum amplitude.
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