INSPECTION METHOD BY ULTRASONIC FLAW DETECTION METHOD AND INSPECTION SYSTEM BY ULTRASONIC FLAW DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a tube inspection method by an ultrasonic flaw detection method which enables the detection of the flaw part of a thin-walled inspection target and capable of measuring even the wall thickness of a normal part, and a tube inspection system by the ultrasonic flaw detection method.;SOLUTION: The inspection system by the ultrasonic flaw detection method is equipped with a probe 10 emitting an ultrasonic wave U and receiving reflected waves I and O, amplifying circuits 214a and 214b for amplifying a receiving signal, a memory 110, an inner surface reflected wave recognizing means 208 for recognizing the reflected wave I from an inner surface, amplifying degree switching means 208, 215 and 216 for lowering the amplifying degrees of the amplifying circuits 214a and 214b so that a receiving signal amplifying value may become below a second threshold value Y when the value amplified by the amplifying circuits 214a and 214b becomes a first threshold value X or above and increasing the amplifying degrees of the amplifying circuits 214a and 214b from a lowered state up to a predetermined time, an outer surface reflected wave recognizing means 208 for recognizing the reflected wave O from an outer surface and a thickness detecting means 111 for detecting the thickness of a wall.;COPYRIGHT: (C)2010,JPO&INPIT