Closed-loop fiber optic current sensor using ferromagnetic collector and Bi4Ge3O12 crystal

Binghao Bao; Jinwei Zhang; Ying Xiao

doi:10.1117/12.805297

2 February 2009 Closed-loop fiber optic current sensor using ferromagnetic collector and Bi₄Ge₃O₁₂ crystal

Binghao Bao, Jinwei Zhang, Ying Xiao

Proceedings Volume 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications; 71570C (2009) https://doi.org/10.1117/12.805297
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

Bi₄Ge₃O₁₂ magneto-optic crystal was chosen as sensitive materials, and a current sensor based on Faraday rotation of materials was designed. A ferromagnetic collector with an air gap and feedback windings were utilized in the sensor to construct a closed-loop current sensor. The magneto-optic crystal showed stronger magneto-optic effect and smaller temperature coefficient when it was exposed to the light, which was produced by a semiconductor laser with a working wavelength of 655nm. The ferromagnetic collector was used to collect the magnetic field generated by the measured current. The collector could greatly reduce the influence of the position variation of the conductor on the output. The measurement system was a closed-loop system due to introducing the negative feedback coil to the measuring system, so the linear range, linearity, temperature stability and dynamic characteristic index of the sensor were improved greatly. The principle of this sensor was introduced in detail. The structure of this sensitive component, as well as the signal conditioning circuit, was given. Some experimental data and the interpretation of these data were presented.

Citation Download Citation

Binghao Bao, Jinwei Zhang, and Ying Xiao "Closed-loop fiber optic current sensor using ferromagnetic collector and Bi₄Ge₃O₁₂ crystal", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71570C (2 February 2009); https://doi.org/10.1117/12.805297

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available