Phase-selective monitoring via vector transformation

Details Phase-selective monitoring via vector transformation Phase-selective monitoring via vector transformation

1988-03-15

1989-09-05

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324225, G01N 2772, G01R 3312

Patent

active

048642355

ABSTRACT:
A defect-sensing device for a test object, e.g. for detecting cracks in metal bodies with the aid of the eddy-current technique, has improved phase-selective properties by adding at least one product and/or quotient former to the signal processing equipment. The output signal from an ordinary phase-controlled rectifier can be substantially described via sin .alpha. and/or cos.alpha. functions in which indicates the phase position of the control signal in relation to the input signal. By multiplying sin.alpha. by cos .alpha. sin 2.alpha. cos 2.alpha. functions are obtained which in turn can be multiplied to obtain the function sin 4.alpha. corresponding to narrow sensitivity lobes in the transducer's impedance plane, thus permitting effective separation of the various types of vector signal resulting from detectable defects.

REFERENCES:
patent: 4424486 (1984-01-01), Denton et al.
patent: 4646013 (1987-02-01), Tornblom
patent: 4661777 (1987-04-01), Tornblom

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