Method of suppressing unwanted indications in automated...

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

G - Physics

01

N

349/42

G01N 29/04 (2006.01) G01N 29/11 (2006.01) G01N 29/32 (2006.01) G01N 29/40 (2006.01) G01N 29/48 (2006.01) G01S 7/52 (2006.01)

Patent

CA 1227559

ABSTRACT OF THE DISCLOSURE 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 indic- ations, in particular in the case of extended statistical suppres- sion, a variable discriminator threshold is derived from the highest of all maximum amplitudes by means of a predetermined amplitude difference. The ultrasonic signals are not evaluated as flaw signals when only the variable discriminator threshold is exceeded but are evaluated as flaw signals only when addition- ally at least the highest of all maximum amplitudes exceeds the fixed discriminator threshold preset for the testing operation.

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