Precise Measurement of Magnetic Field for Geophysical, Space, and Security Applications

Measurement of small temporal and space variations of the magnetic field is required for many applications such as geophysics, space research, defense, industry, or security systems. In this article, the focus is mainly on the vectorial sensors used in the unshielded environment. We proved that not only low noise but also other parameters such as linearity and temperature stability are critical. Hightemperature SQUID gradiometers are finding applications in the airborne scanning system as the magnetic field variations to be detected are small and the instrument’s cost is not prohibitive. Despite advances in atomic magnetometers and small tunneling magnetoresistors (TMRs), fluxgate sensors are usually the best solution for many applications. That is the reason why our research is focused on the development of fluxgate magnetometer. In this article, many different applications of these sensors, involving, for example, mapping of the magnetic field using drone, visualization of the magnetic field around the small drone, and spectrogram images created for the diagnostics of a ventilation system, are presented. Based on the knowledge obtained during the research and application of magnetic sensors, the magnetometer application as a part of the developed security system is presented.