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DEPARTMENT OF THE ARMY WASHINGTON D C
Pagination or Media Count:
A wire of Nitinol can be stretched up to a given amount and will remain in this stretched state until heated to a critical temperature. When heated to the critical temperature, the wire restores to its original length. When the wire restores to its original length, it exhibits a substantial tensile force and this force can be used to operate a device such as a photographic shutter operatively attached to the wire, for example. The trigger circuit of this invention provides a current pulse for the required time period to heat the Nitinol wire to its critical temperature to thereby restore the wire to its original length. The circuit includes a high power transistor which is gated on for a controlled time to provide the required power to heat the Nitinol wire to its critical temperature. Author
APPROVED FOR PUBLIC RELEASE