Electricity: measuring and testing – Magnetic – Magnetometers
Reexamination Certificate
2005-05-25
2010-10-26
LeDynh, Bot L (Department: 2858)
Electricity: measuring and testing
Magnetic
Magnetometers
C324S261000
Reexamination Certificate
active
07821259
ABSTRACT:
The invention concerns a device and a method for examining magnetic properties of objects, in particular of sheet material such as for example bank notes. Therein the invention proceeds from a device and a method for examining magnetic properties of objects with a magneto-optical layer having magnetic domains, the optical properties of the magneto-optical layer being influenced by the magnetic properties of the object to be examined, at least one light source for the generation of light incident upon the magneto-optical layer, and at least one sensor for the reception of light which is transmitted and/or reflected by the magneto-optical layer, with a magnetic filed in the area of the magneto-optical layer which extends substantially parallel to the surface of the magneto-optical layer.
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Dötsch Horst
Holthaus Carsten
Schanda Ulrich
Schützmann Jürgen
Trifonov Alexei
Bacon & Thomas PLLC
Giesecke & Devrient GmbH
LeDynh Bot L
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