Apparatus for measuring propagation time of ultrasonic waves

Details Apparatus for measuring propagation time of ultrasonic waves Apparatus for measuring propagation time of ultrasonic waves

1984-05-03

1987-08-04

Krass, Errol A.

Boots, shoes, and leggings

364486, 364571, 377 20, G01R 2902, G04F 1000

Patent

active

046850759

ABSTRACT:
In apparatus for measuring the propagation time of ultrasonic waves by counting the number of clock pulses occurring within the period of time from the transmission of an ultrasonic pulse to the receiving of the pulse, a receiving circuit receives a transmitted pulse and a received pulse and provides an output which continues from transmission until reception of the pulse. A time-difference detection circuit detects pulses occurring during a time interval t.sub.1 starting at the leading edge of the transmission pulse and ending at the leading edge of the first clock pulse thereafter and a time interval t.sub.2 starting at the leading edge of the received pulse and ending at the leading edge of the first clock pulse thereafter. The duration of the time interval t between transmission and reception is determined in accordance with the equation

REFERENCES:
patent: 4165459 (1979-08-01), Curtice
patent: 4303983 (1979-12-01), Chaborski
patent: 4434470 (1984-02-01), Thomas et al.
patent: 4468746 (1984-08-01), Davis
patent: 4485452 (1984-11-01), Cording et al.
patent: 4523288 (1985-06-01), Hayashi

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