US 11,927,569 B2
Ultrasonic flaw detection device, ultrasonic flaw detection method, and ultrasonic flaw detection program
Hiroshi Takemoto, Tokyo (JP); Mitsuyoshi Uematsu, Tokyo (JP); Seiji Kobayashi, Tokyo (JP); Takahito Shimomukai, Tokyo (JP); and Naoya Iwata, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/419,943
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Jan. 30, 2020, PCT No. PCT/JP2020/003323
§ 371(c)(1), (2) Date Jun. 30, 2021,
PCT Pub. No. WO2020/189042, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-052985 (JP), filed on Mar. 20, 2019.
Prior Publication US 2022/0065821 A1, Mar. 3, 2022
Int. Cl. G01N 29/26 (2006.01); G01N 29/04 (2006.01); G01N 29/44 (2006.01)
CPC G01N 29/262 (2013.01) [G01N 29/04 (2013.01); G01N 29/4463 (2013.01); G01N 2291/023 (2013.01); G01N 2291/0289 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An ultrasonic flaw detection device that performs 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 device comprising:
a scanning unit that moves, in the scan direction of the subject, the flaw detection probe installed 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 beam control unit that controls 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 unit that receives a reflected beam reflected from the subject; and
a flaw estimation unit that estimates a length of a flaw in a circumferential direction of the subject on the basis of the reflected beam; and
a correction unit that corrects 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.