US 12,247,949 B2
Apparatus and method for pipeline inspection using EMAT generated shear waves
Sergey Popov, Hellevoetsluis (NL)
Assigned to P & L PIPE SURVEY B.V., Hellevoetsluis (NL)
Appl. No. 17/612,626
Filed by J. van Beugen Beheer B.V., Hellevoetsluis (NL)
PCT Filed May 20, 2020, PCT No. PCT/EP2020/064143
§ 371(c)(1), (2) Date Nov. 19, 2021,
PCT Pub. No. WO2020/234394, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 2023174 (NL), filed on May 21, 2019.
Prior Publication US 2022/0221429 A1, Jul. 14, 2022
Int. Cl. G01N 29/04 (2006.01); G01N 29/24 (2006.01); G01N 29/265 (2006.01); G01N 29/44 (2006.01)
CPC G01N 29/043 (2013.01) [G01N 29/2412 (2013.01); G01N 29/265 (2013.01); G01N 29/4445 (2013.01); G01N 2291/023 (2013.01); G01N 2291/0422 (2013.01); G01N 2291/105 (2013.01); G01N 2291/2636 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for detecting and classifying cracks in a pipeline, the method comprising the steps of:
emitting a first shear wave along a region of inspection, the first shear wave being polarized in a first direction;
receiving the first shear wave;
emitting a second shear wave along the region of inspection, the second shear wave being polarized in a second direction at a minimal angle of about 10° different from the first direction;
receiving the second shear wave;
examining the anisotropy of the first and second received shear waves by comparing at least one wave property of said first and second received shear waves for detecting and classifying cracks in the region of inspection of the pipeline.