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Design and Characterization of a Tri-Axial Magneto-Optical Probe for Measuring Magnetic Fields in Low-Frequency Bands
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DOI：10.1109/tim.2026.3718102.png)
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Abstract
En 中文
There is growing public concern about the magnetic fields (MFs) generated by electrical equipment. When measuring magnetic fields in railway environments, there is the challenge of requiring multiple types of sensors. Furthermore, the magnetic fields generated by industrial equipment, such as railways, have multiple sources of magnetic fields, and it is difficult to identify the direction of the maximum magnetic field. Additionally, measurements are often taken in confined spaces where it is difficult to reposition sensors, making it necessary to capture magnetic field components from all directions using a compact probe installed in a fixed position, so it is necessary to use a tri-axial probe for magnetic field measurement. To address these challenges, we developed a tri-axial version of a single-axial magneto-optical probe (MO probe) capable of covering the desired frequency and intensity ranges. The use of a right-angle prism has made it possible to measure magnetic fields in three orthogonal directions in a compact sensing head. In addition to the polarizer, analyzer, and so on, a small-form-factor photodetector was housed within the housing to prevent output fluctuations caused by vibrations in the optical fiber cable, and the optical fiber cable between the analyzer and the photodetector was fixed inside the housing. Furthermore, by selecting a laser with excellent low-frequency characteristics as the light source, noise reduction in the low-frequency range was achieved. These measures enabled a lower detection limit of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1~\mu $ </tex-math></inline-formula>T. Experiments verifying the basic characteristics of the tri-axial MO probe confirmed that no crosstalk occurs between the three axes and that the desired frequency band and intensity range are satisfied. Furthermore, the phase characteristics and other properties are clarified.
Keywords:
Electromagnetic fields
Faraday effect
magnetic field (MF) measurement
tri-axis
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