Magnetic detection of security articles

Details Magnetic detection of security articles Magnetic detection of security articles

1997-12-10

1999-11-30

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

235450, 235493, G06K 708

Patent

active

059927410

ABSTRACT:
A method for detecting the presence of magnetic elongated particles in a substrate the base material of which has magnetic properties substantially differing from the corresponding magnetic properties of the elongated particles. The elongated particles have such a long and thin form that their demagnetisation factor N is smaller than 1/250, they have a diameter smaller than 30 micrometer and a magnetic saturation field greater than 100 A/m. The method comprising the following steps:

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