Array for non-destructive material testing of cylindrical workpieces by means of electrodynamic ultrasonic measurement

An array for non-destructive testing of cylindrical workpieces such as pipes or ends of pipes by means of at least electrodynamic ultrasonic excitation, comprising:

• at least one magnet having pole shoes;
• and
• at least one supporting means for supporting and guiding the workpieces;
• said pole shoes being rotatable around axes parallel to a longitudinal axis of one of the workpieces being guided by said supporting means, said pole shoes being provided with at least one electrodynamic transducer resting on said one of said workpieces in a contact area, said supporting means comprising rollers, said rollers being rotatable about axes which coincides with axes of rotation of said pole shoes, said one of said workpieces being supported on each roller in a linear area of lower circumferential surface of said one of the workpieces, and said linear area, offset in a longitudinal direction of said one of the workpieces, corresponding to said contact area of said electrodynamic transducer.