Patent ID: 11867863
Assignee: ONTECH SECURITY, S.L.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A device for measuring disruptions in a controlled magnetic field and generated by the device itself surrounding a sole conductive element, antenna or electrode and comprising:
a controlled magnetic field sensor connected in a closed loop to the electrode comprising:
an oscillator circuit connected to the electrode;
a digital module; and
a processor connected to the digital module;

wherein an output signal of an active element of the oscillator circuit is connected to a primary winding (L2) of a transformer (L1, L2) whereas a signal at the electrode which is connected to a secondary winding (L1) of the transformer (L1, L2) is further connected to an input (MIN) of the active element of the oscillator circuit via a feedback network (RF, CF); and wherein the oscillator circuit comprises a polarisation network (RBIAS, VBIAS) configured to polarise, at least, one input transistor (MIN) of the active element of the oscillator circuit;
wherein the output signal generated by the active element of the oscillator circuit generates a controlled magnetic field in the electrode and this signal feedbacks the input (MIN) of the active element of the oscillator circuit by means of the feedback network (RF, CF), and
wherein the digital module is connected to the input (MIN) of the active element of the oscillator circuit and arranged to digitally process the signal that recharges the input (MIN) of the active element of the oscillator circuit such that the signal can be acquired by the processor.