Method and system for obtaining near-surface characteristics of

Details Method and system for obtaining near-surface characteristics of Method and system for obtaining near-surface characteristics of

1996-09-27

1998-06-16

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73602, 310336, G01N 2918, G01N 2922

Patent

active

057674086

ABSTRACT:
In a method for obtaining near-surface characteristics of a material, a broadband ultrasonic Rayleigh wave including a plurality of components is generated, with a generating system, in the material. The Rayleigh wave is detected with a detection system remote from the generating station. The detected Rayleigh wave is filtered to obtain selected ones of the plurality of components of the detected Rayleigh wave at selected frequencies. Velocities of the selected components of the detected Rayleigh wave are determined at the selected frequencies. A system for obtaining near-surface characteristics of a material is also disclosed.

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"The Measurement of Surface and Near-surface Stress in Aluminum Alloys Using Ultrasonic Rayleigh Waves" by B. G. Martin, Materials Evaluation (1974), vol. 32, 11, pp. 229-234.

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