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2020/12/11

Succeeded in ultra-sensitive magnetic field measurement using optical fiber

University Journal Online Editorial Department

　An international collaborative research team at Yokohama National University, Tokyo Institute of Technology, Shibaura Institute of Technology, Espirito Santo Federal University (Brazil), and Aveiro University (Portugal) measures magnetic fields using optical fibers based on a new physical phenomenon called plastic optical fiber fuses. I succeeded in doing it.

　One of the many advantages of optical fiber sensors is their resistance to electromagnetic noise.It is advantageous for measuring deformation and temperature in a strong magnetic field environment, but it is difficult to measure the magnetic field itself.A substance that reacts to a magnetic field is actively added to a conventional optical fiber type magnetic field sensor, which is costly and the system configuration itself is complicated.Therefore, it has been desired to realize a magnetic field sensor having a high sensitivity and a simple structure using a low-cost optical fiber that does not require a special substance.

　In 2014, Associate Professor Yosuke Mizuno of Yokohama National University and others observed for the first time the fuse phenomenon (the phenomenon of optical fiber destruction by light) in plastic optical fibers.This time, we discovered for the first time that the plastic optical fiber after the fuse reacts to the magnetic field, and by incorporating a simple configuration called inter-mode interference (interference of multiple lights passing through different paths) into the sensor, it is low cost and super. Succeeded in highly sensitive magnetic field measurement.

　We also demonstrated that the peak wavelength of the sensor output spectrum shifts with extremely high sensitivity (5pm / mT) when a 113.5cm optical fiber is used.This sensor can detect minute changes in the magnetic field (45µT), which corresponds to the magnitude of the geomagnetism in Japan.This is hundreds of times smaller than the conventional method (20 mT) using terbium-added optical fiber.

　The results of this research are expected to be applied to magnetic field monitors for electric power systems, transformers, rotating machines, etc., as well as electromagnetic environment surveys in various fields in the future.

Paper information:[Advanced Photonics Research] Highly sensitive fiber-optic intrinsic electromagnetic field sensing

Shibaura Institute of Technology

Fostering global science and engineering human resources who support Japan

Shibaura Institute of Technology will celebrate its 2027th anniversary in 100.With a system of 4 departments and 16 course in 1 faculties, Faculty of Engineering, Faculty of Systems Science and Engineering, Faculty of Design Engineering, and Faculty of Architecture, "Data Science Courses" will be introduced in all faculties from 2020, and there are so many research fields that they are called "Science and Engineering University". I am proud of.Each student […]

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Yokohama National University

Fostering glocal human resources through education that integrates the Faculty of Humanities and Social Sciences and the Faculty of Science and Technology

Yokohama National University consists of five faculties: Faculty of Education, Faculty of Economics, Faculty of Business Administration, Faculty of Science and Technology, and Faculty of Urban Science.Set in Yokohama, which is free and open, we are developing human resources who can play an active role in glocal by inheriting advanced and practical academics while demonstrating the flexibility and agility unique to medium-sized universities.Various backgrounds […]

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Tokyo Institute of Technology

The pinnacle of science and engineering university that continues to produce science and engineering people with high aspirations and a Japanese spirit, mastering the knowledge that creates the times, refining their skills

Tokyo Institute of Technology was established as the Tokyo Institute of Technology in 1881 (Meiji 14), when modernization of industry was an urgent need.Since its establishment, it has continued to produce excellent research results with excellent science and engineering human resources, and is still at the top of Japan's science and engineering universities.Tokyo Institute of Technology requires not only a high degree of specialization but also liberal arts […]

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