在工件的同一区域，由两个相互交叉成一定角度（不等于0°或180°）的单

In the same area of ​​the workpiece, two single yokes crossing each other at a certain angle (not equal to 0° or 180°) form a two-phase alternating magnetic field with a certain phase difference (not equal to 0° or 180°). A magnetic particle detection device that generates a rotating magnetic field in this area.

In the same area of the workpiece, two single magnetic crucibles that cross into an angle (not equal to 0 or 180 degrees) are formed, forming a magnetic powder detection device in which a two-phase intersecting magnetic field with a certain phase difference (not equal to 0 degrees or 180 degrees) is superimposed on each other and a rotating magnetic field is generated in the region.

In the same area of the workpiece, two single yokes that cross each other to form a certain angle (not equal to 0 ° or 180 °) form a magnetic particle testing equipment that has a certain phase difference (not equal to 0 ° or 180 °) and two intersecting variable magnetic fields superposed each other to produce a rotating magnetic field in this area.<BR>