G - Physics – 01 – R
Patent
G - Physics
01
R
324/48, 317/12.2
G01R 33/00 (2006.01) H01H 59/00 (2006.01) H01H 83/14 (2006.01) H02H 3/33 (2006.01)
Patent
CA 1131696
ABSTRACT OF THE DISCLOSURE The device detects variations in magnetic flux so that the passage through a given threshold by the amplitude of such a variation per unit time is manifested by the movement of an element adapted to trigger an action. It comprises a practically closed electrical circuit, such as a winding, ar- ranged and mounted so that the variation in a magnetic flux to be detected generates by induction at the terminals of this winding an electrical volt- age V, two electrodes forming a capacitor, one of which is movable with re- spect to the other, an electret interposed between these two electrodes and whose charge produces a field exerting on these electrodes an electrostatic force H tending to bring them mutually together, means for forming a recti- fied voltage U from said voltage V and for applying this voltage U between the two electrodes in a direction such that the field which results there- from is opposite that generated by the electret and hence tends to reduce the force H, and means urging the movable electrode scarcely reversibly in the opposite direction to the force H. The force G of these urging means and the charge of the electret are selected so that the overshoots by the voltage U of a predetermined threshold Uo corresponding to the level to be detected of the magnetic flux-generating phenomenon cause swings of the mov- able electrode from its vigilance position to its active position, the triggering of said action being servocoupled to said swings.
331956
Dreyfus Gerard
Lewiner Jacques
Perino Didier
Dreyfus Gerard
Lewiner Jacques
Perino Didier
Smart & Biggar
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