ULTRASONIC IMAGE INSPECTION DEVICE

摘要

PURPOSE:To prevent an image distortion which is generated due to a constant- speed scanning by enabling an ultrasonic wave to be transmitted at a scanning position which is ahead by approximately 1/2 of a time from transmission to reception and then an echo from a specimen to be received at a scanning position after approximately 1/2 of a time at each measurement-point position. CONSTITUTION:After focusing of a probe 3 is completed, a delay time T equivalent to a time t =2L/V (L; distance. V; sound speed) from transmission of an ultrasonic wave to its reception and a data at each measurement point of a specimen 22 is sampled by a constant-speed plane scanning. When a measurement point A is taken as an example, the probe 3 receives an echo at the measurement point A of the ultrasonic wave which is transmitted at T ( /2) time before reaching the measurement point A before reaching the measurement point A. Therefore, a measurement signal which is actually obtained after A/D conversion agrees with the measurement point A and a sampling positions of reciprocating measurement data do not deviate when the probe 3 performs a reciprocating scanning, thus preventing an image from being distorted.