SYSTEM AND METHOD FOR ULTRASONIC AUTOMATIC FLAW INSPECTION

摘要

PPROBLEM TO BE SOLVED: To obtain an ultrasonic automatic flaw inspection system for correcting the quantity of eccentricity caused by positional shift and obtaining a precise flaw inspection result. PSOLUTION: A plurality of array probes 11A-11D are provided, which are arranged so as to cover the whole periphery of a round bar 20 through a contact medium 21 and irradiate the round bar 20 with an ultrasonic beam to receive the reflected beam echo reflected from the acoustic discontinuous part in the round bar 20 and a transducer 10 for exciting the array probes 11A-11D. The transducer 10 calculates not only the distance from the array probes 11A-11D to the surface of the round bar 20 on the basis of the sonic speed of the contact medium 21 and the propagation delay time of the reflected beam echo reflected from the surface of the round bar 20 but also the quantity of eccentricity of the round bar 20 on the basis of the distance from the array probes 11A-11D to the surface of the round bar 20 known in an eccentricity-free case and the calculated distance and changes the exciting condition of the array probes 11A-11D so as to correct the quantity of eccentricity of the round bar 20 and excites the array probes 11A-11D so as to change the direction of the ultrasonic beam to irradiate the round bar 20. PCOPYRIGHT: (C)2010,JPO&INPIT