FIELD: engineering of means for studying properties of sheet material, bank notes for example.
SUBSTANCE: in accordance to invention, bank notes are researched having magneto-optical layer with optical properties changing under influence of magnetic properties of object. During research, light source is utilized for light generation and injection of light into magneto-optical layer. Detection of light passing through magneto-optical layer and/or reflected by aforementioned layer is performed. Light source and magneto-optical layer are positioned so, that light injected into magneto-optical layer expands mostly in parallel to main surface of this magneto-optical layer.
EFFECT: increased precision and reliability of research of magnetic properties of sheet material.
3 cl, 4 dwg
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