idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
The Fraunhofer Institute for Nondestructive Testing IZFP carries out research and development activities in the field of nondestructive testing processes along the entire materials value chain. For customers in the automobile, aerospace, rail, energy, construction and agriculture industries, the institute offers a wide range of NDT expertise and technologies. From June 13 to 17, 2016, our researchers and engineers will present and disuss the issue of surface inspection and remanence imaging with magnetic field distortion measurement at the World Conference on Non-Destructive Testing (WCNDT) in Munich.
Measurement of magnetic field distortion (MFD) allows for a high-resolution detection of magnetic and geometrical anomalies in ferromagnetic surfaces. This method is based upon the distortion of a magnetic field at surface irregularities. The setup for MFD measurement requires a magnetic field source such as a permanent magnet, and a magnetic field strength sensor like a Hall probe or GMR sensor. As opposed to conventional magnetic flux leakage (MFL) measurement, the flux density inside the material is very small, and only the surface facing the sensor is evaluated. Local damage of the surface, e.g. corrosion-related pitting can be located and imaged accurately, independent on its overall lateral direction.
Sensor synergies between MFD and MFL setups allow combining both methods with further benefits. MFL measurements can be designed to be sensitive for both sides of ferromagnetic pipe material, i.e. the side facing the sensor as well as the far side. This way, combining the information of both methods allows separating inner from outer defects and additionally determining the lateral outline of outer defects.
Besides the application for defect detection, MFD sensors can be used for imaging and documentation of remanent magnetic fields.
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