| 摘要 |
<p>Device utilizing eddy current technique for measuring and/or supervision of test objects, such as billets, with respect to, for example, surface cracks, comprising at least one transducer/sensor, which moves over the surface of the test object. According to the invention the device suppresses, completely or partially, harmless surface deformations, such as oscillation marks, by compensating the sensitivity characteristic, in the direction of movement of the transducer/sensor, with the respect to the surface deformation. The device includes a transducer/sensor with at least two coils (6,7) of different dimension and/or shapes and appropriate processing of signals with different carrier frequencies from the two different coils or transducers.</p> |
