Magnetometry for Security Applications.

Magnetic field is an information medium for security applications as well as other physical fields. From the security point of view, the magnetic field is the second safest physical field just after the gravitation field, because it is hard to manipulate the magnetic field in wide area without notice and it is impossible to shield it completely. Magnetic field variations can be generated by several different sources - by the movement of the object in the Earth’s magnetic field, by the current flow between the device and the power lines, by the changes in the residual magnetization caused by the temperature change of the object and others. The presented article describes examples of the possibilities when securing the objects by magnetic sensors, the experimental part of the article presents a set of basic experiments to demonstrate the possibility of using magnetometry for security applications.