METHOD AND DEVICE FOR SHEET MATERIAL PROPERTY CONTROL Russian patent published in 2009 - IPC G07D7/04 

FIELD: textile; paper.

SUBSTANCE: invention concerns measurement means for physical properties of sheet material. Sensor device for optical measurement of at least two different properties of sheet materials, particularly banknotes (100), includes common measuring window (2), to which at least two sources (B1, B2) of different electromagnetic emission suitable for measurement of different properties are directed. One or more detectors (D1-D3) directed towards measuring window detect reflected, reradiated, missing and/or fluorescent emission. In particular, measuring window can hold magnetic to optic converter (5) for detection of magnetic properties in sheet material which features dichroic reflector coating (5c) and reflects emission used in magnetooptic measurement at one wavelength band while missing emission at another wavelength band. Such multipurpose sensor device can be compact and perform control of most different physical properties.

EFFECT: measurement of maximum number of different properties of sheet material by a compact device.

12 cl, 10 dwg