Method for optical characterization and evaluation of optically variable devices and media
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United States of America Patent
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May 18, 2010
Grant Date -
Aug 30, 2007
app pub date -
Feb 26, 2007
filing date -
Feb 28, 2006
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Abstract
Methods for evaluating an optically variable device (“OVD”) or optically variable media (“OVM”) are disclosed. The methods include the steps of applying light of a single wavelength from a calibrated light source to the OVD or OVM; measuring the light diffracted by the OVD or OVM with an integrating sphere; measuring the total incident light on the OVD or OVM; and calculating a diffraction efficiency for the OVD or OVM at the single wavelength based on the measurement of light diffracted and the measurement of total incident light.
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