US 12,007,363 B2
Measuring method and measuring device
Takashi Usui, Saitama (JP); and Kazuo Watabe, Kanagawa (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Aug. 27, 2021, as Appl. No. 17/459,627.
Claims priority of application No. 2020-186553 (JP), filed on Nov. 9, 2020.
Prior Publication US 2022/0146457 A1, May 12, 2022
Int. Cl. G01N 29/14 (2006.01); G01N 29/44 (2006.01)
CPC G01N 29/14 (2013.01) [G01N 29/449 (2013.01); G01N 2291/0289 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A measuring method, comprising:
detecting sound waves radiated from point sound sources on a surface of a structural object formed of a solid material due to generation of elastic waves at an occurrence source inside the structural object and propagation of the elastic waves from the occurrence source to the surface at a plurality of positions based on a reference position in a non-contact manner; and
estimating a position of the occurrence source of the elastic waves by calculating a distance from the reference position to the occurrence source in a plan view on the basis of a relationship estimated by calculations in advance between variable distances and amplitude values of sound waves depending on azimuth angles of axes connecting each of the plurality of positions and the reference position with respect to a direction from the occurrence source toward the reference position, and on the basis of amplitude values of the detected sound waves depending on the azimuth angles.