Method and apparatus for ultrasonic nondestructive testing of wo

Details Method and apparatus for ultrasonic nondestructive testing of wo Method and apparatus for ultrasonic nondestructive testing of wo

1977-05-04

1978-07-25

Queisser, Richard C.

Measuring and testing

Vibration

By mechanical waves

73614, 73631, G01N 2904

Patent

active

041022050

ABSTRACT:
A method and apparatus for ultrasonic nondestructive testing of workpieces include automatic compensation of echo responsive electrical signals commensurate with preprogrammed test parameters. The test parameters include at least one of the following: depth dependent correction of the individual DGS (distance, gain, size) values for each respective probe; correction for material related properties of the workpiece and coupling medium; correction for temperature affecting the testing of the workpiece. Preferably, a compensating signal generated commensurate with the sum of the correction signals is used for varying either the gain of a receiver amplifier or a predetermined level provided to a comparator circuit or both. Embodiments disclosed are applicable for processing both analog and digital echo responsive electrical signals.

REFERENCES:
patent: 3555889 (1971-01-01), Weighart
patent: 3942361 (1976-03-01), Rath
patent: 4043181 (1977-08-01), Nigam

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