Abstract
Quantitative nondestructive evaluation is a critical issue for the structural integrity of material system used in airplanes and aerospace planes. Various types of alternative evaluation methods are developed, including ultrasound analyses, thermal tomographies, and electrical impedance techniques. These methods involve an attempt to characterize structural defects, which may not be detectable by visual inspection. Although those methods are well-known practical techniques, there exists a growing interest of developing the new and improved methods for evaluating the more accurate defect profiles of material systems. SQUIDs have the potential to detect material defects in conductors due to their extremely high magnetic flux sensitivity for magnetic fields. A mathematical model of the nondestructive evaluation system is described by electromagnetic potential problems. The forward analyses using finite element model are implemented for the conductor with a crack. A computational method using a genetic algorithm is proposed for recovering internal defect profiles with HTS-SQUID data.
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