Apparatus for examining properties of objects

Details Apparatus for examining properties of objects Apparatus for examining properties of objects

2005-08-09

2005-08-09

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

Reexamination Certificate

active

06927571

ABSTRACT:
The invention relates to apparatus for examining magnetic properties of objects, in particular sheet material, such as bank notes (20). The apparatus comprises a magneto-optic layer (10) whose optical properties are influenceable by the magnetic properties of the sheet material (20), a light source (11) for producing light that is coupled into the magneto-optic layer (10), and a detector (13) for detecting light that is transmitted and/or reflected by the magneto-optic layer (10). For reliable examination of the magnetic properties of sheet material it is provided that the direction of propagation of the coupled-in light extends parallel to a base surface (9) of the magneto-optic layer (10). The invention permits the magnetic properties in particular of sheet material with areas emitting very weak magnetic fields to be examined with very high sensitivity and reliability.

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