Optimization of NDE Characterization Parameters for a RF-SQUID Based System Using FEM Analysis

We have investigated the dependence of the optimal non destructive evaluation (NDE) characterization on different excitation parameters in an eddy current SQUID NDE system for samples with known flaw depths. The considered parameters in our study include the configuration of the excitation-coil and...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2009-06, Vol.19 (3), p.791-795
Main Authors: Fardmanesh, M., Sarreshtedari, F., Pourhashemi, A., Ansari, E., Vesaghi, M.A., Schubert, J., Banzet, M., Krause, H.-J.
Format: Article
Language:English
Subjects:
Applied sciences
COMPUTER SIMULATION
COPPER OXIDE
Eddy currents
Electrical engineering. Electrical power engineering
Electromagnetic interference
Electromagnets
Electronics
Exact sciences and technology
Excitation
FEM
Finite element method
Finite element methods
INTERFERENCE
MATHEMATICAL ANALYSIS
Mathematical models
NDE parameters optimization
Noise level
Nondestructive testing
Numerical analysis
Optimization
PARAMETERS
Radio frequency
RF SQUID gradiometer
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sensor phenomena and characterization
Sensor systems
SQUID-based NDE
SQUIDs
Superconducting devices
SUPERCONDUCTORS
Testing, measurement, noise and reliability
Various equipment and components
Yttrium barium copper oxide
YTTRIUM OXIDE
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Summary:We have investigated the dependence of the optimal non destructive evaluation (NDE) characterization on different excitation parameters in an eddy current SQUID NDE system for samples with known flaw depths. The considered parameters in our study include the configuration of the excitation-coil and its current frequency. The system is based on a high-T C YBCO gradiometer RF-SQUID sensor with a flux noise level below 100 muPhi 0 /radicHz at 100 Hz in an unshielded environment, while being shielded against external RF EMI (electromagnetic interference). According to experimental results and the associated numerical analysis using finite element (FEM) simulations, we have derived the optimized parameters for the maximum sensitivity of the system. The optimized parameters are found using a new model for excitation coil and eddy current anomalies caused by the flaws. Very good agreement between experimental and numerical approaches confirmed our model and the resultant implemented optimization method.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2009.2018739