Method and apparatus using a varying electromagnetic field for d

Details Method and apparatus using a varying electromagnetic field for d Method and apparatus using a varying electromagnetic field for d

1989-12-18

1993-02-23

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324225, 324239, G01N 2772, G01R 3312

Patent

active

051893665

ABSTRACT:
Method and apparatus for determining the nature or property of a non-metallic material in which the material is passed through a time varying magnetic field. The signals which are induced in the sensing coil for the magnetic field are processed for measurement. Although the material is non-metallic, it may have sufficient conductivity at the frequencies employed to cause the flow of eddy-currents to generate a measurable signal. The method of the invention also provides for measurement of permittivity or diamagnetic properties of the material which may also give rise to small measurable signals.

REFERENCES:
patent: 2477057 (1949-07-01), Grady, Jr.
patent: 2587664 (1952-03-01), Stout
patent: 3665302 (1972-05-01), Lees et al.
patent: 4553094 (1965-11-01), Gehrke
Discriminating Method for Freshness, Ripeness, Internal Quality of Vegetable and Fruit, H. Kato, Patent Abstract of Japan, vol. 12, No. 210, p. 717, (3057) Jan. 1988.

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