Measuring and testing – Vibration – By mechanical waves
Patent
1998-01-02
1999-11-23
Williams, Hezron
Measuring and testing
Vibration
By mechanical waves
73625, 73628, 73634, G01N 2910, G01N 2926
Patent
active
059879912
ABSTRACT:
A method of non-destructively evaluating or validating a processed area of an object such as a metallic laser shock peened surface by determining Rayleigh wave angles at various positions on the surface. The Rayleigh wave angle is determined by: (a) directing incident beams of ultrasonic waves onto at least one point of a surface at a plurality of incident angles; (b) simultaneously measuring intensity of a combination of corresponding directly reflected and re-radiated beams at a plurality of corresponding reflected angles equal in magnitude to the incident angles with respect to a line normal to the surface; (c) generating a null angle profile of data indicating intensity versus corresponding incident angles from measured intensities in step (b); (d) determining an intensity curve by applying a polynomial curve fit to a low intensity portion of the null angle profile; and (e) determining the effective critical angle for the corresponding Rayleigh wave by determining a substantially minimum point on the curve. The polynomial curve fit may be a second order polynomial fit and the plurality of incident angles and corresponding reflected angles are predetermined and in close proximity to a predetermined critical angle.
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Bashyam Manohar
Trantow Richard L.
General Electric Company
Gressel Gerry S.
Hess Andrew C.
Miller Rose M.
Williams Hezron
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