Method for measuring the wall thickness of a workpiece by ultra-

Details Method for measuring the wall thickness of a workpiece by ultra- Method for measuring the wall thickness of a workpiece by ultra-

1987-12-29

1989-06-13

Chapman, John

Measuring and testing

Vibration

By mechanical waves

73901, G01N 2900

Patent

active

048380865

ABSTRACT:
A method and an apparatus for measuring the wall thickness of a workpiece by ultra-sound is disclosed. For measuring the wall thickness, it is necessary to determine the time interval between a surface echo occurring during irradiation by ultra-sound and a rear wall echo. According to the present invention, a saw tooth generator generates a saw tooth signal including a sequence of saw teeth when the surface echo occurs. Each of the saw teeth causes a counting pulse to be generated. Upon occurrence of the rear wall echo, the instantaneous amplitude value of the saw tooth signal is measured and the number of counting pulses is recorded by a counter. Each counting pulse defines a constant unit of wall thickness. The amplitude value provides a fraction of such wall thickness unit.

REFERENCES:
patent: 4388830 (1983-06-01), Narushima et al.
patent: 4471657 (1984-09-01), Voris et al.
patent: 4658648 (1987-04-01), Roddeck et al.
Krautkramer et al., Ultrasonic Testing of Materials, 3rd. edn. (Springer-Verlag, New York) 1983, pp. 278-286.

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