Electricity: measuring and testing – Magnetic – With compensation for test variable
Patent
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
McKelvy James W.
Miller, Jr. Walter E.
Gibson Robert P.
Lane Anthony T.
Sims Robert C.
Snow Walter E.
Strecker Gerard R.
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