Patent ID: 8638091

Claim:
A rotary eddy current testing probe device for detecting flaws on an object being inspected, comprising: a rotating disc ( 111 ); and four eddy current testing probes (P 11 , P 21 , P 12 , P 22 ) attached at approximately equal intervals in a circumferential direction around a rotation center (Ds 1 ) of the rotating disc ( 111 ), wherein the four eddy current testing probes (P 11 , P 21 , P 12 , P 22 ) are composed of two sets of the eddy current testing probes, each one set including two eddy current testing probes located on opposite sides with respect to a rotation center (Ds 1 ), and each of the four eddy current testing probes has a circular exciting coils (Ec 11 , Ec 21 , Ec 12 , Ec 22 ) for exciting a current in the object being inspected, and a rectangular detector coils (Dc 11 , Dc 21 , Dc 12 , Dc 22 ) disposed on an inside of the exciting coil for detecting the current exited in the object being inspected; coil planes of the exciting coils (Ec 11 , Ec 21 , Ec 12 , Ec 22 ) are parallel with a rotation plane of the rotating disc; coil planes of the detector coils (Dc 11 , Dc 21 , Dc 12 , Dc 22 ) are perpendicular to the rotation plane of the rotating disc; the coil planes of the four detector coils (Dc 11 , Dc 21 , Dc 12 , Dc 22 ) are parallel with each other, and incline at a predetermined angle (θ) relative to a line (Y 1 ) passing through the respective centers of two eddy current testing probes of one set of the two-set eddy current testing probes; and the two detector coils (Dc 11 , Dc 12 ) of the one set of eddy current testing probes are cumulatively connected to each other, and the two detector coils (Dc 21 , Dc 22 ) of the other set of eddy current testing probes are differentially connected to each other.