themoon Posted May 22, 2007 Report Share Posted May 22, 2007 Can anyone explain to me the working principle of a magnetic sensor?????? Quote Link to comment Share on other sites More sharing options...
prateeksikka Posted May 22, 2007 Report Share Posted May 22, 2007 if i am asked to make it ,i would make a simple relay .other's comments r welcome! Quote Link to comment Share on other sites More sharing options...
LostViking Posted May 24, 2007 Report Share Posted May 24, 2007 It's hard to determine from the information. There may be two answers. First some alarms use magnetic sensors at windows and doors. This is simply a magnet and a reed switch that is pulled closed by the magnet when they are close. The second type might be actually an inductive sensor. It is usually excited by a weak oscillator and when metal is moved into the inductors field (it is part of the tuned circuit of the osc) the oscillator shifts in frequency and this is detected by other circuits.I hope this helps. If not please supply a bit more information. What sensor specifically? Quote Link to comment Share on other sites More sharing options...
gan87 Posted June 8, 2007 Report Share Posted June 8, 2007 hi,lost vikings i feel ur post is the exact theory behind metal detectors,a weak rf range oscillator serves as the input,and sensing coil forms parts of tuned oscillator..if u r interested in its working;here it is..when the coil is bought near a metallic object, magnetic energy is absorbed and oscillator fails to work. this can be detected by another circuit and alarm can be triggered Quote Link to comment Share on other sites More sharing options...
gan87 Posted June 8, 2007 Report Share Posted June 8, 2007 prateeksikkai agree... simple relays can do tat...but the thing is the field must be of great strength.......its nt possible all time.. Quote Link to comment Share on other sites More sharing options...
gan87 Posted June 8, 2007 Report Share Posted June 8, 2007 i guess magnetic sensors use magnetostriction effect...... Quote Link to comment Share on other sites More sharing options...
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