Echo cancellation system

Details Echo cancellation system Echo cancellation system

1988-05-03

1989-10-24

Chapman, John

Measuring and testing

Vibration

By mechanical waves

73615, G01N 2904

Patent

active

048753726

ABSTRACT:
An ultrasonic inspection system for composite materials capable of detecting flaws near the surface of the inspected part which flaws are normally masked by strong reflections from the part surface. An electronic signal representative of the strong surface echo is stored in memory and subtracted in a differential amplifier from the entire test piece echo representative signal in time relationship which effects cancellation of the signal representative of the strong surface echo thereby allowing weaker echo representative signals from defects near the surface to the detected.

REFERENCES:
patent: 4041774 (1977-08-01), Morris et al.
patent: 4098130 (1978-07-01), Coffey et al.
patent: 4545251 (1985-10-01), Uchida et al.

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