Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1976-10-21
1978-04-11
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
G01R 3312
Patent
active
040841367
ABSTRACT:
An eddy current testing device for measuring variable characteristics of a sample generates a signal which varies with variations in such characteristics. A signal expander samples at least a portion of this generated signal and expands the sampled signal on a selected basis of square waves or Walsh functions to produce a plurality of signal components representative of the sampled signal. A network combines these components to provide a display of at least one of the characteristics of the sample.
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Harmuth, H. F. Transmission of Information by Orthogonal Functions, Springer-Verlag, 2nd Ed., 1972, pp. 30, 31 and 93-95.
Roch et al., Generation of Walsh Function Expansion Coefficients, Proc. of Symp. on Appl. of Walsh Function, 1973, pp. 268-269.
Siemens et al., Walsh Series to Fourier Series Conversion, 1972, Proceeding IEEE, pp. 295-297.
Blachman, N. M.; Sinusoids Versus Walsh Functions, Proc. of IEEE vol. 62, No. 3, Mar. 1974, pp. 346-354.
Hildebrand Bernard P.
Libby Hugo L.
Battelle (Memorial Institute)
Corcoran Robert J.
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