Measuring and testing – Vibration – By mechanical waves
Patent
1998-01-02
1999-11-02
Williams, Hezron
Measuring and testing
Vibration
By mechanical waves
73625, 73628, 73633, G01N 2910, G01N 2924
Patent
active
059748893
ABSTRACT:
An apparatus for ultrasonically scanning a surface includes a plurality of pairs of 180 degree oppositely disposed transducers mounted in a rotatable head having a central axis about which the head is rotatable. A positioning system for positioning the transducers such that all beam axes of the transducers intersect the central axis at a single point. Axes of each pair are equiangular with respect to the centerline and axes of different pairs have incident and reflective angles between beam axes and the central axis that are different from those of other pairs. Incident and reflective angles of different pairs of transducers are preferably predetermined and in close proximity to a predetermined angle over a range of angles bracketing a predetermined critical angle. A translating system is preferably included for effecting translational motion between the head and the surface such that the single point lies substantially on the surface during scanning. The present method further provides a non-destructive material evaluation technique to determine effective Rayleigh wave critical angles using the apparatus. The effective critical angle may be determined from an angular beam intensity profile generated from the beam intensity data provided by each pair of fixed angle transducers.
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General Electric Company
Gressel Gerry S.
Hess Andrew C.
Miller Rose M.
Williams Hezron
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