ELECTROMAGNETIC-ACOUSTIC TRANSDUCER AND ULTRASONIC TEST SYSTEM HAVING THE SAME

摘要

The invention relates to an electromagnetic-acoustic transducer (EMAT) for ultrasonic testing of test objects substantially made of electrically conductive material, having a magnet system (115) for generating a magnetic field for penetrating into the test object (160), and an inductive coil arrangement (140) for generating an alternating electromagnetic field superimposed on said magnetic field in the test object, and for detecting alternating electromagnetic fields emitted by the test object. The magnet system (115) is disposed in a magnetization unit (110), while the coil arrangement is disposed in a probe unit (120) separate from the magnetization unit. The probe unit is (120) displaceably supported relative to the magnetization unit (110) in the area of the magnetic field. The EMAT allows test objects to be scanned at a high relative speed, but without substantial limitations with regard to the service life of the EMAT or test sensitivity.