Duration: 01.06.2020 – 31.05.2022

Research institutions:

  • Fraunhofer Institute for Ceramic Technologies and Systems IKTS
  • Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Dresden Klotzsche
  • Helmholtz Centre Dresden-Rossendorf e.V.

 

Abstract:

For defect testing on curved geometries with flexible sensors, so-called multi-channel flexible coil systems based on non-destructive eddy current testing are currently used. For technological reasons, these coil-based systems only work at higher test frequencies and therefore at low penetration depths. The industry’s demand for flexible eddy current arrays for sensitive applications with high penetration depths of 1.5mm to 10mm can therefore not be met at present. However, this is becoming increasingly important, particularly with regard to free-form components produced by means of additive manufacturing, as well as through the increased use of geometrically complex fibre composites.
With conventional systems, the magnetic field sensitivity is reduced when the measuring frequency is reduced, as is the lateral resolution. GMR sensors as receiver systems, on the other hand, have the advantage of a frequency-independent magnetic field sensitivity and therefore offer the option of achieving a higher diagnostic depth with a consistently high spatial resolution. In addition, GMRs are predestined as array sensors due to their smaller dimensions and high manufacturing reproducibility. The approach taken in this project also enables the construction of flexible GMR sensors for use on components with complex geometry.
The overall aim of the project is to develop an innovative flexible eddy current GMR sensor array with improved sensitivity, greater diagnostic penetration depth up to 10 mm at a spatial resolution 0.5 mm to enable mapping of electrically conductive components with complex shapes.
The resulting access to innovative testing methods and their manufacturing technologies gives SMEs important advantages in establishing their own products. Es profitieren somit Hersteller der Prüfsysteme als auch Prüfdienstleister, welche ihre Produktportfolios mit innovManufacturers of testing systems as well as testing service providers who expand their product portfolios with innovative solutions will benefit.ativen Lösungen erweitern.