Tuesday, October 17, 2006
Metal Detection - Prototype 2
Our first attempt at building a metal detecting system used some basic principles of electricity. Here, the two coils of wire produce an electromagnetic field when a current is passed through them. These fields yield a certain frequency and when metal enters one of the fields, it changes its frequency. Both coils are to be tuned to the same frequency where one stays as a reference and the other is used for metal detection. Normally, a beat is produced when the frequency of the search coil changes (due to metal interference). Our goal was to use this input and when metal was detected our flexinol should have flexed.
The result: the wire flexed once and stayed in that position. There are a number of variables we tried in wiring the system, but all yielded the same result.