Field measuring system

Details Field measuring system Field measuring system

1984-11-19

1987-01-06

Lall, Parshotam S.

Boots, shoes, and leggings

364485, 324247, 324 79R, G01R 2302

Patent

active

046352074

ABSTRACT:
A method and apparatus for measuring the individual strengths of two superimposed vector fields at different frequencies by sensing the three orthogonal directional components of the field, sampling these three components in rapid repetitive sequence, squaring the amplitudes of the resulting samples, filtering the squared samples to select the second harmonics of those field frequency components to be measured, amplitude-detecting the filtered signals, and detecting the square root of the amplitudes of the detected signals. Such method and system eliminates the need to provide highly accurately matched components for each separate frequency channel, as is required in previously-known systems.

REFERENCES:
patent: 3781664 (1973-12-01), Rorden
patent: 3781860 (1973-12-01), Freyling, Jr.
patent: 4334273 (1982-06-01), Ikeda
patent: 4492923 (1985-01-01), Byram

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