Measuring and testing – Vibration – By mechanical waves
Patent
1998-05-12
2000-06-06
Larkin, Daniel S.
Measuring and testing
Vibration
By mechanical waves
73620, 73627, 73628, G01N 2906, G01N 2910, G01N 2924
Patent
active
060704667
ABSTRACT:
The invention provides a device for the ultrasonic inspection of a multilayer metal workpiece consisting of at least one parent metal layer and a clad metal layer, and having an outer surface, at least one boundary surface, and an inner surface, the device comprising a housing accommodating at least three spaced-apart, ultrasonic transducing means capable of receiving electrical input signals, initiating transmission of ultrasonic waves to the workpiece, and receiving reflected ultrasonic waves to be transduced into electrical output signals, the transducing means being constituted by an acoustic prism having a first face for at least indirectly contacting a workpiece, a second face extending in a plane forming an angle .alpha. with the plane of the outer surface of the workpiece, and a piezocrystal attached to the second face, wherein the distance L.sub.2 between the points where the acoustic axes of each of the second and the third spaced-apart transducing means of the three spaced-apart transducing means traverses the first face of its acoustic prism, is determined by the expression L.sub.2 =K.multidot.2 h.multidot.tand, wherein K is a coefficient indicating the number of skips of the shear wave reflection from the inner surface of the workpiece, and h is the mean thickness of the clad metal layer.
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Jassby Kenneth
Muchnik Stella
Taran Vladimir
Vachtenberg Oz
Casella Anthony J.
Hespos Gerald E.
Larkin Daniel S.
Miller Rose M.
Porco Michael J.
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