Power line field interference rejection for magnetic sensors

Details Power line field interference rejection for magnetic sensors Power line field interference rejection for magnetic sensors

1981-09-18

1985-04-30

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324207, 307520, 328166, G01R 3300, H03K 500

Patent

active

045146900

ABSTRACT:
The discriminator consists of two major parts; a nonlinear filter for low vel rejection, and inhibiting logic for high level rejection, of ac magnetic fields. The nonlinear filter approximately halves the frequency characteristics of a particular class of signals, while at the same time doubling the frequency of normal interfering signals. The inhibiting logic uses the known in-phase relationship to sense and reject even very large time dependent interference. However, spatially variant signals observed from near field relative motion of two orthogonal magnetic sensors with respect to a ferro-magnetic object have a near quadrature relationship that permits signal recognition even when of less amplitude than the interference.

REFERENCES:
patent: 3281593 (1966-10-01), Mendelsohn
patent: 3573441 (1971-04-01), Glazay
patent: 4317077 (1982-02-01), Zwarts

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