Abstract
We have constructed an imaging device that is capable of showing the spatio-temporal distribution of magnetic flux density in real-time. The device employs a set of AMR (anisotropic magneto-resistance) three-axis magnetometers, which are arranged into a two-dimensional sensor array. All of the magnetic field values measured by the array are collected by a microcontroller, which pre-processes and sends the data to a PDU (processing and display unit) implemented on a smartphone/tablet or a computer. The interpolation algorithm and display software in the PDU present the field as a high-resolution video; thus, the device works as a magnetic field camera. In the experiments, we employ the camera to map the field distribution of the distorted ambient magnetic field caused by a hidden object. The obtained image of field shows both the position and shape of the object. We also demonstrate the capability of the device to image a loaded power-line cable carrying a 50 Hz alternating current.
Highlights
The sensor array performs the spatial sampling of the magnetic field on an area, which is achieved by arranging the magnetometers into a two-dimensional array
This paper reports the construction of magnetic field camera using an array of digital magnetometers
As a proof-of-concept, we built a system using 4 × 4 sensor elements connected via a multiplexer to a processing unit and tested it to measure the magnetic field of ferromagnetic objects behind a surface
Summary
Andriyan Bayu Suksmono 1, * , Donny Danudirdjo 1, *, Antonius Darma Setiawan 2 , Dien Rahmawati 2 and Rizki Putra Prastio 3. Faculty of Advanced Technology and Multidiscipline, Universitas Airlangga, Surabaya 60115, Indonesia;. Featured Application: The proposed device can be used to find underground utilities that have ferromagnetic properties and subsurface power-line cable carrying electrical current
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