Ultrasonic inspection system

Abstract

In an ultrasonic inspection system for inspecting the surface condition of an object or the existence or absence of internal defects in it by ultrasonically scanning the object with ultrasonic beams, which have been successively produced as a result of successive excitation of a number of array element oscillators (10.sub.1 -10.sub.n) arranged in a row, and then analyzing waves reflected by the object, reference data for individual ultrasonic beams (individual channels) are collected by ultrasonically scanning a reference material of defect-free uniform quality before ultrasonic inspection of the object. Correction values are prepared based on these reference data, and signals received by the ultrasonic scanning of the object are corrected by these correction values. According to one correction means, the ratios of the average value of reference values of the individual channels to the reference values of the individual channels are determined channel by channel. Using these ratios as correction values, they are multiplied to signals received through the corresponding channels. The products are used as data to be shown on a display unit (21). By these attenuation factors, signals received through the corresponding channels are attenuated at a sensitivity equalizer (31 ). Scattering in sensitivity among the individual channels can be eliminated by these correction means.