Nonlinear ultrasonic scanning to detect material defects

Details Nonlinear ultrasonic scanning to detect material defects Nonlinear ultrasonic scanning to detect material defects

1997-01-08

1998-04-07

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73625, 73628, 73641, 12866007, 12866009, 12866101, G01N 2906, G01N 2926

Patent

active

057366420

ABSTRACT:
A method and system are provided to detect defects in a material. Waves of known frequency(ies) are mixed at an interaction zone in the material. As a result, at least one of a difference wave and a sum wave are generated in the interaction zone. The difference wave occurs at a difference frequency and the sum wave occurs at a sum frequency. The amplitude of at least one nonlinear signal based on the sum and/or difference waves is then measured. The nonlinear signal is defined as the amplitude of one of the difference wave and sum wave relative to the product of the amplitude of the surface waves. The amplitude of the nonlinear signal is an indication of defects (e.g., dislocation dipole density) in the interaction zone.

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