DEVICE FOR PROTECTING AN OBJECT HAVING THE CURRENT-CARRYING SURFACE Russian patent published in 1994 - IPC

FIELD: protective signalling. SUBSTANCE: device has a capacitive position pickup with a frequency-setting capacitor, a processing circuit of the capacitive pickup signal which allows to control the change of the capacitor capacitance and an alarm assembly. The application of the current-carrying surface of the object as one capacitor plate and of a jacket as its other plate allows to warn against the attempt of penetrating to the object by means of the jacket removal. The fact that the jacket is made of elastic multilayer material with current-carrying layers used as a complementary capacitor gives the possibility of recognizing the attempt of damaging the jacket itself. EFFECT: improved protection of objects. 3 cl, 3 dwg