Method of suppressing unwanted indications in automated ultrason

Details Method of suppressing unwanted indications in automated ultrason Method of suppressing unwanted indications in automated ultrason

1984-09-17

1986-04-15

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73612, 73613, 73618, 73598, G01N 2904

Patent

active

045819378

ABSTRACT:
The invention relates to a method of suppressing unwanted indications in automated ultrasonic testing of a test piece.
In order to improve the suppression of unwanted indications, in particular in the case of extended statistical suppression, a variable discriminator threshold (3) is derived from the highest of all maximum amplitudes (2) by means of a predetermined amplitude difference (4), wherein the ultrasonic signals are not evaluated as flaw signals when only said variable discriminator threshold (3) is exceeded but are evaluated as flaw signals only when additionally at least the highest of all maximum amplitudes (2) exceeds the fixed discriminator threshold (1) preset for the testing operation.

REFERENCES:
patent: 3346068 (1967-10-01), Woods et al.
patent: 4187725 (1980-02-01), Gavrev et al.
patent: 4205553 (1980-06-01), Rudis et al.
patent: 4432235 (1984-02-01), Renzel et al.
patent: 4518811 (1965-08-01), Sternberg et al.
Ultrasonic Testing of Materials, Krautkramer, Springer-Verlag, 1977, pp. 247-252.

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