Ultrasonic thickness measuring method and apparatus

Details Ultrasonic thickness measuring method and apparatus Ultrasonic thickness measuring method and apparatus

1989-01-31

1991-04-23

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

364563, G01N 924

Patent

active

050091034

ABSTRACT:
An ultrasonic thickness measuring method and apparatus in which an ultrasonic pulse is transmitted from a probe to a material to be measured and resulting multiple reflection pulses from the material to be measured are detected to obtain a time interval between the reflection pulses for measuring the thickness of the material. This method and apparatus features, for example, comprises counting a time from transmission of the ultrasonic pulse to reception of a first reflection pulse from a bottom of the material to be measured; detecting a pulse received within a preset period of time after said first reflection pulse has been received and just before a time corresponding to the counted time has passed, as a second reflection pulse; and counting a time between the reception of the first reflection pulse and the reception of the second reflection pulse to measure the thickness of the material.

REFERENCES:
patent: 3339403 (1967-09-01), Barnes
patent: 3354700 (1967-11-01), Schindler
patent: 3427868 (1969-02-01), Charbonnier et al.
patent: 3690154 (1972-09-01), Wells et al.

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