Eddy current testing probe

Abstract

An exciting coil is constructed by winding a winding in a groove formed on the outer circumference of a circular ring member, and a detecting coil in the shape of a polygon (such as a triangle and a pentagon) when seen from the front is positioned. One side of the detecting coil is placed in a diameter direction of the exciting coil, inside the exciting coil, and the vertex opposite to the one side is placed apart from the exciting coil so that the detecting coil is orthogonal to the exciting coil. A side surface of the exciting coil on the side opposite to the vertex is placed to face the surface of a test material, and used as a flaw detection surface.

1 . An eddy current testing probe comprising: 
 an exciting coil; and    a plurality of detecting coils positioned on a center axis of said exciting coil so that center axes of said detecting coils are in a plurality of different directions respectively crossing a center axis direction of said exciting coil.    
     
     
         2 . The eddy current testing probe of  claim 1 , further comprising a selector for selecting a maximum output voltage from output voltages of said plurality of detecting coils.  
     
     
         3 . The eddy current testing probe of  claim 1 , 
 wherein each of said plurality of detecting coils is composed of a conductor wound in a shape of a polygon, and is positioned by placing one side of the polygon on the exciting coil side and placing a vertex opposite to the one side apart from the exciting coil.    
     
     
         4 . The eddy current testing probe of  claim 3 , further comprising a selector for selecting a maximum output voltage from output voltages of said plurality of detecting coils.