Non-Destructive Evaluation (NDE) Technology Initiatives. Delivery Order 0031: Modeling of Eddy Current Array Sensor Sensitivities
Final rept. 26 Nov 2001-31 Oct 2002
IOWA STATE UNIV AMES CENTER FOR NONDESTRUCTIVE EVALUATION
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A computer simulation has been developed to evaluate eddy-current probes containing magnetic field sensor arrays for the detection and evaluation of hidden corrosion. The simulation is used to assess probes that incorporate magneto-resistive or Hall devices in a closely spaced, linear array. These probes will allow rapid data acquisition over a track width determined by the length of the array. The benefit of the simulation is that adjustments to the virtual probe parameters are easily made, allowing improvements in sensitivity, imaging capability, and resolution. A number of probe designs have been studied in this way, including the racetrack probe. A numerical model for finding the unknown dipole density inside the flaw region has been developed. The analysis is based on the curl of edge elements for representing the dipole density and use of Galerkins method for evaluating the unknowns. Tree-cotree decomposition is used to reduce the problem complexity.
- Computer Programming and Software
- Electricity and Magnetism