Method, device, sensor and algorythm for detection of devices stealing information from atm devices

Method according any preceding claims, characterized in that the signal of the narrowband channel is processed and analyzed with a higher priority.

Device for detection of devices stealing information (skimming devices), comprising sensors for electromagnetic emissions, characterized in that the said sensors are one or more sensors (1) according to the invention and in that the device comprises also a master micro controller (9) for control of the sensors and processing the output of the said sensors (1), and a notifying module (10) sending a signal to a control center in case of presence of electromagnetic emissions with a level exceeding the said “noise level”.

Sensor for detection of electromagnetic emissions comprising a receiving part, characterized in that the receiving part is a planar inductive antenna (13) with high own resonance frequency and surface depending on the location monitored for presence of a skimming device, and in that the sensor comprises also an amplifying part representing a preamplifier (2) with high input impedance and differential input;

• a regulating part representing a circuit for regulating the gain (5) digitally, the said circuit being controlled by a micro controller (8) by means of digital-analog converter (11) with definitive resolution;
• a filtering part comprising a broadband channel and a narrowband channel;
• and a converting part comprising a logarithmic converter with detector (4) having a large value of the dynamics for converting the input high frequency voltage to a permanent voltage according to a logarithmic principle.