Patent ID: 6229872
Filing Date: 2001-05-08
Classification: G01N

Abstract:
A method for use in inspecting an object, the method comprising the steps of:generating a plurality of inspection signals each indicative of at least one internal physical characteristic of a portion of the object;changing orientation for generating each of the plurality of inspection signals, wherein for each of the plurality of inspection signals the step of generating includes the steps of:directing a source signal at the portion of the object;detecting an output signal from the portion of the object, the output signal being indicative of the at least one internal physical characteristic of the portion of the object, the step of directing and the step of detecting being performed using an orientation relative to the portion of the object; andgenerating the inspection signal in response to the output signal; andgenerating, in response to the plurality of inspection signals, a signal indicative of at least one measure of correlation between the plurality of inspection signals to reduce effects of distortion on the results of the inspection for better distinguishing between distortion and defects in inspected objects.