Magnetic detection means

Details Magnetic detection means Magnetic detection means

1977-02-04

1978-02-14

Swann, III, Glen R.

Communications: electrical

Systems

Call station

324234, 340258C, G08B 1326

Patent

active

040742490

ABSTRACT:
Magnetic detection means for protection of articles such as books, records and the like, wherein a target, of magnetically soft or easily saturable magnetic material, such as permalloy foil, is mounted on the protected article and emits magnetic signals which are harmonics of an interrogating magnetic field generated at an exit station. The target is curved along its length and provides good signal response over a wide range of orientation.

REFERENCES:
patent: 3665449 (1972-05-01), Elder et al.
patent: 3697996 (1972-10-01), Elder et al.
patent: 3747086 (1973-07-01), Peterson
patent: 3765007 (1973-10-01), Elder
patent: 3790945 (1974-02-01), Fearon
patent: 3820103 (1974-06-01), Fearon
patent: 3820104 (1974-06-01), Fearon
patent: 4000488 (1976-12-01), Ephraim

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