Patent ID: 11927569
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. An ultrasonic flaw detection method of performing an ultrasonic flaw detection on a subject of which an external shape changes in a scan direction, using a flaw detection probe that is a phased-array ultrasonic flaw detection probe in which a plurality of oscillators are disposed in an arc shape at intervals, the ultrasonic flaw detection method comprising:
an installation step of installing a flaw detection probe such that a reference curvature center, which is a curvature center of an external curve of a cross section of the subject at a reference scan position of the subject coincides with a curvature center of the flaw detection probe;
a scanning step of moving the flaw detection probe in the scan direction of the subject;
a beam control step of controlling an ultrasonic beam emitted from the flaw detection probe such that a converging position of the ultrasonic beam coincides with an inspection curvature center that is a curvature center of an external curve of a cross section of the subject at each scan position;
a receiving step of receiving a reflected beam reflected from the subject; and
a flaw estimation step of estimating a length of a flaw in a circumferential direction of the subject on the basis of the reflected beam; and
a correction step of correcting an estimated length of the flaw by using a correction coefficient according to an amount of deviation between the reference curvature center and each inspection curvature center in a thickness direction of the subject.