Patent ID: 6070466
Filing Date: 2000-06-06
Classification: G01B,G01N

Abstract:
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, said 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 said workpiece, and receiving reflected ultrasonic waves to be transduced into electrical output signals,each of said 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 said workpiece, and a piezocrystal attached to said 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 said at least three spaced-apart transducing means traverses the first face of the associated acoustic prism, is determined by the expression:L.sub.2 =K.multidot.2 h.multidot.tandwherein:K is a coefficient indicating the number of skips of the shear wave reflection from the inner surface of said workpiece, andh is the mean thickness of said clad metal layer.