The detection of a crack under fastener heads (CUF) in a multi-layered aircraft structure remains a challenge in non-destructive evaluation (NDE). An EC-GMR system using a linear eddy current (EC) coil with giant magnetoresistive (GMR) sensors located on the axis of symmetry is proposed for detecting discontinuities in conducting materials. The signal received from sensors is greatly influenced by the interrogating field. This paper describes a detailed parametric study, using a finite element model predicted signals in conjunction with a multi-parameter optimization problem for coil design. The sensor performance is assessed using quantitative measures based on Probability of detection (POD) with respect to different crack geometries.
Optimization of Coil Design for Near Uniform Interrogating Field Generation
TAMBURRINO, Antonello;
2015-01-01
Abstract
The detection of a crack under fastener heads (CUF) in a multi-layered aircraft structure remains a challenge in non-destructive evaluation (NDE). An EC-GMR system using a linear eddy current (EC) coil with giant magnetoresistive (GMR) sensors located on the axis of symmetry is proposed for detecting discontinuities in conducting materials. The signal received from sensors is greatly influenced by the interrogating field. This paper describes a detailed parametric study, using a finite element model predicted signals in conjunction with a multi-parameter optimization problem for coil design. The sensor performance is assessed using quantitative measures based on Probability of detection (POD) with respect to different crack geometries.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
