FIELD: measurement technology.
SUBSTANCE: polymeric film authentification method includes the stage, when the birefringence of the layer inside this film is measured, the birefringence value obtained at the measurement stage is compared with the preset birefringence value indicating the film recognised as authentic, to determine, whether the specified film is authentic or not, on the basis of the named comparison.
EFFECT: possibility of film protection without making any changes in it.
20 cl, 5 dwg
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