Apparatus for detecting ferromagnetic material

Details Apparatus for detecting ferromagnetic material Apparatus for detecting ferromagnetic material

1983-08-02

1984-05-15

Swann, III, Glen R.

Communications: electrical

Vehicle detectors

Inductive

340551, 340568, G08G 101

Patent

active

044491158

ABSTRACT:
A convertor is used having an impedance responsive to the magnetic field intensity of the earth. The convertor may be coupled to a detector for monitoring the impedance of the convertor and generating a call signal responsive to the change in impedance. Generally, the impedance is primarily inductance and the detector is an oscillator using the convertor in a resonant circuit with a frequency monitor coupled to the detector. The convertor is an open magnetic structure having a non-linear BH curve biased by the earth's magnetic field. The open magnetic structure is a core of a highly permeable material which approaches saturation under the influence of the earth's magnetic field, with the axis of the core at least partially aligned with the magnetic flux lines of the earth's magnetic field, and a coil wound around the axis of the core.

REFERENCES:
patent: 3249915 (1966-05-01), Koerner
patent: 3319161 (1967-05-01), Beynon
patent: 3775742 (1973-11-01), Koerner et al.
patent: 3825889 (1974-07-01), Koerner
patent: 3984764 (1974-07-01), Koerner
patent: 3989932 (1976-11-01), Koerner

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