Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-03-17
1977-01-18
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3312
Patent
active
040042162
ABSTRACT:
An apparatus for detecting the presence of metallic particles in a flow of dielectric material is based upon the principle of measuring the frequency shift of an oscillator upon passage of such a particle through the self induction coil forming part of said oscillator. Special arrangements are provided for rendering the magnetic field as uniformly as possible within the coil so that the magnitude of the signal is not subject to significant fluctuations whether the particle passes through the center of the self-induction coil or not.
REFERENCES:
patent: 2958037 (1960-10-01), Riede et al.
patent: 3103655 (1963-09-01), Jones
patent: 3231815 (1966-01-01), Spencer
patent: 3665298 (1972-05-01), Geiger
De Gueldre Jean Martha
Natens Luc Yves
AGFA-GEVAERT N.V.
Corcoran Robert J.
Daniel William J.
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