Patent ID: 6591681
Filing Date: 2003-07-15
Classification: G01N

Abstract:
A nondestructive inspection apparatus for diagnosing an internal defect of a measuring object by injecting an acoustic elastic wave into said measuring object, said apparatus comprising:a vibrating section which is adapted to be placed in pressure contact with a surface of said measuring object for generating said acoustic elastic wave; a receiving section which is adapted to be placed in pressure contact with the surface of said measuring object for receiving a reflected wave of said acoustic elastic wave; a pushing mechanism for pushing said vibrating section and said receiving section against the surface of said measuring object; a pushing force measurement section for detecting pushing forces of said vibrating section and said receiving section against the surface of said measuring object during vibration thereof; a vibration control section for driving said vibrating section thereby to generate said acoustic elastic wave; and a reception signal processing section for determining said internal defect based on a reception signal from said receiving section; wherein said reception signal processing section comprises: a reflection energy calculation section for calculating a reflection energy level due to elasticity vibration of said measuring object based on said reception signal; a reflection energy correction section for normalizing said reflection energy level by said pushing forces to calculate a correction value; and an internal defect determination section for detecting said internal defect based on said correction value.