TERMIUM Plus®

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optical variable device [1 record]

Record 1 1998-08-11

English

Subject field(s)
  • Security Devices
  • Photoelectricity and Electron Optics
DEF

A piece of plastic coated with multiple layers of thin film; a single film layer is no thicker than a wavelength of light - four millionths of an inch. Employing the principle of optical interference, these film coatings control the transmission, absorption and reflection of light. The device will no longer color-shift and this will warn consumers that the product may have been tampered with.

French

Domaine(s)
  • Dispositifs de sécurité
  • Photo-électricité et optique électronique

Spanish

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