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1INTENDED USE
This operating manual (hereinafter referred to as the Manual) describes the design,
operating principle and service instructions for the hardware and software system
of magneto-optical hysteresigraph MOHyster Regula 7708 (hereinafter referred to as
the device, MOHyster and the MO hysteresigraph)
MOHyster is designed for instrumental examination of magnetic printing and magnetic
security features of documents by means of determination of multiple magnetic
characteristics of these objects, such as:
1) function of 2D spatial distribution of the stray magnetic eld on the object surface
В(x, y), which can be represented as:
11 topogram (spatial distribution function) of the magnetic induction normal
component B(x, y) in the form of an accumulated (measuring) magneto-optical
image (Fig 1-1), where the brightness of the points represents the value of В for
each of the image points;
12 histogram (probability density function) of the magnetic induction normal
component В in the form of a graph (Fig 1-2) which shows the number of points
of the magneto-optical image in the columns These points have the corresponding
value of the stray magnetic eld normal component В [T];
13 modulus of the magnetic ux normal component Φ [Wb] through the magneto-
optical sensor area (Fig 1-2), calculated based on the estimation data of magnetic
induction В(x, y);
2) static magnetic hysteresis characteristics of different types: by magnetic ux Ф-Н
(Fig 1-4), by magnetic induction В-Н, and by magnetization М-Н;
3) function of 3D spatial distribution of the stray magnetic eld over the object surface
В(x, y, z), which can be represented as:
31 tomogram (layer structure) of the stray magnetic eld, consisting of a set
of 2D functions В(x, y), measured at different distances z from the object surface;
32 graphs of magnetic induction maximum functions Вm(x, y, z) or magnetic
ux Ф(z);
33 volume integral of the magnetic induction ∫В(x, y, z) [T*m3]
The device comes with specialized software designed to perform the following:
operation mode selection, conguration and control;
document authenticity verication/identication by comparative examination
of magnetic characteristics using reference specimens;
secondary mathematical processing of magneto-optical images with the purpose
of their analysis, comparison, geometry estimation and intelligibility/visibility
enhancement;
documentation of ndings and adding data with magnetic parameters
of document security features to the databases of security documents
To illustrate the technical capabilities of the device, below is a screenshot (Fig 1)
of the main window of specialized software CADR (with the MOHyster module), showing
the results of the examination of a magnetic security feature of a banknote A $100
banknote of the 2006 series was used as an example 1 – display area of the accumulated
magneto-optical images; 2 – display area of the magnetic induction Вn histograms and
the magnetic ux Фn calculated values; 3 – display area of the 3D magnetic history
of measurements of the current hysteresis curve; 4 – display area of the magnetic
hysteresis characteristics
