Accession Number : ADD004566

Title :   Trigger Circuit.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Orlando,Carl

Report Date : 11 Jan 1977

Pagination or Media Count : 4

Abstract : 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)

Descriptors :   *Patents, *Trigger circuits, Wire, Nickel alloys, Titanium alloys, Heating, Recovery, Length

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE