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Proceedings Paper

Set of line gratings as a diffraction structure protecting optical signs against copying: new proposal including colorimetric aspects
Author(s): Zbigniew Kraska; Mariusz Szyjer; Andrzej Kowalik
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Paper Abstract

Well known properties of diffraction gratings are connected with their response to wavelength and polarization state of light incident on a grating. Although diffraction gratings are used as one of structures in modern optical security sings, their interesting properties seem to be rather rarely taken into consideration for distinguishing between originals and 'illegal' copies of optical marks. In this paper a relative simple diffraction structure and corresponding alterative method of inspection are proposed. This method can be particularly useful for machine reading, although its usability for visual inspection can also be considered.

Paper Details

Date Published: 24 August 2001
PDF: 8 pages
Proc. SPIE 4535, Optical Sensing for Public Safety, Health, and Security, (24 August 2001); doi: 10.1117/12.438432
Show Author Affiliations
Zbigniew Kraska, Institute of Applied Optics (Poland)
Mariusz Szyjer, Institute of Applied Optics (Poland)
Andrzej Kowalik, Institute of Electronic Materials Technology (Poland)


Published in SPIE Proceedings Vol. 4535:
Optical Sensing for Public Safety, Health, and Security

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