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We have constructed an imaging device that capable to show a spatio-temporaldistribution of magnetic field intensity in real-time. The device employs a setof AMR (Anisotropic Magneto Resistance) 3-axis magnetometers, which arearranged into a two-dimensional sensor array. All of the magnetic field valuesmeasured by the array are collected by a microcontroller, which pre-process andsend the data to a PDU (Processing and Display Unit) implemented on asmartphone/tablets or a computer. An interpolation algorithm and displaysoftware in the PDU present the field as a high-resolution video; hence, thedevice works as a magnetic field camera. In the experiments, we employ thecamera to map the field distribution of distorted ambient magnetic fieldinduced by a hidden object. The obtained image of field shows both the positionand shape of the object. We also demonstrate the capability of the device toimage a loaded power-line cable carrying a 50~Hz alternating current.

A Magnetic Field Camera for Real-Time Subsurface Imaging Applications