Electroactive Polymers With Anti-Counterfeiting Feature
Patent application, FIled 28 Sept 2010
NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
Pagination or Media Count:
The present invention provides a new class of currency and documentation that is secure against counterfeiting, and against accidental or deliberate mischaracterization. The documentation has one or more structures made of electrostrictive polymer, normally invisible to human observation under ambient conditions, applied to one or more locations of the documentation. The locations can be selected in predetermined positions relative to visible features present on the documentation. The electrostrictive polymer can be interrogated by application of an electric field to those areas where the polymer is located. The polymer responds by changing a physical dimension along the direction of the applied electric field. The change in dimension can be sensed, and provides a signal that is indicative of authenticity or denomination. The systems and methods can be applied to other documents.
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