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Faraday-effect optical current sensor with a garnet film/ring core in a transverse configuration
Toshihiko Yoshino1, Shin-ichi Torihata, Masayuki Yokota
1Department of Electronic Engineering, Gunma University,1-5-1 Tenjin-cho, Kiryu 376-8515, Japan. yoshinot@educet.plala.or.jp
Applied Optics
|April 10, 2003
Summary
A novel Faraday effect current sensor utilizes a magnetic ring-core design with an obliquely inserted garnet film. This innovative transverse scheme offers high sensitivity and isolation, presenting a simpler, cost-effective optical current sensing solution.
Area of Science:
- Optoelectronics
- Magneto-optics
- Sensor Technology
Background:
- Optical current sensors offer advantages in electrical isolation and bandwidth.
- Existing Faraday effect sensors often employ complex or expensive designs.
Purpose of the Study:
- To introduce a new, simpler, and more cost-effective Faraday effect current sensor scheme.
- To demonstrate the performance of a magnetic ring-core type optical current sensor.
Main Methods:
- A uniaxial magnetic garnet film is obliquely inserted into a narrow gap of a magnetic ring core.
- A probe light beam is passed through the garnet film in the transverse direction relative to the core.
Main Results:
- The developed current sensor exhibits good sensitivity.
- Excellent isolation from surrounding currents is achieved due to the narrow core gap.
- The transverse scheme is simpler and less expensive than longitudinal schemes.
Conclusions:
- The proposed transverse Faraday effect current sensor is practical and cost-effective.
- This design offers a viable alternative for optical current sensing applications.