JST  Vol.2 No.1 , March 2012
Influence of Magnetic Field Inhomogeneity on a Magneto-Optical Current Sensor
ABSTRACT
The growth in the capacity of electric power system creates a demand for the protection of relaying systems. Optical current transducers—OCT that are mainly made up of single mode optical fibers which are subjected to Faraday rotation are used as a replacement for electromagnetic transducers due to their immunity to electromagnetic interference. However, the principal parameter in this system, the sensitivity to magnetic fields or current, depends on the Verdet constant, which is low in the case of optical fibers. However, the optical path length can be increased to compensate for it by winding the fiber around a current carrying element a large number of turns. In this work, we study a current sensor, which is made up of a conductor coil with a fiber inside, thus increasing sensitivity. We study the effect of the inhomogeneity of the magnetic field induced by the current on the sensitivity of the optical fiber sensor.

Cite this paper
H. J. El-Khozondar, M. S. Müller, R. J. El-Khozondar and A. W. Koch, "Influence of Magnetic Field Inhomogeneity on a Magneto-Optical Current Sensor," Journal of Sensor Technology, Vol. 2 No. 1, 2012, pp. 19-22. doi: 10.4236/jst.2012.21004.
References
[1]   F. Rahmatian and J. N. Blake, “Applications of High Voltage Fiber Optic Current Sensors,” 2006 IEEE Power Engineering Society General Meeting, Montreal, 18-22 June 2006.

[2]   M. J. Freiser, “A Survey of Magneto-Optic Effects,” IEEE Transactions on Magnetics, Vol. 4, No. 2, 1968, pp. 152-161. doi:10.1109/TMAG.1968.1066210

[3]   J. G. Bai, G. Lua and T. Lin, “Magneto-Optical Current Sensing for Applications in Integrated Power Electronics Modules,” Sensors and Actuators A, Vol. 109, 2003, pp. 9-16.

[4]   H. J. El-Khozondar, R. J. El-Khozondar, M. S. Mueller and A. W. Koch, “Sensitivity of TM Nonlinear Magnetooptical Integrated Optical Sensor,” Multidicipline Modeling in Materials and Structures (MMMS), accepted, 2011.

[5]   B. Lee, “Review of Present Status of Optical Fiber Sensors,” Optical Fiber Technology, Vol. 9, No. 2, 2003, pp. 57-79.

[6]   B. Wu, Y. Yang, and K. Qiu, “Magneto-Optic Fiber Bragg Gratings with Application to High-Resolution Magnetic Field Sensors,” 1st Asia-Pacific Optical Fiber Sensors Conference, Chengdu, 7-9 November 2008.

[7]   L. Shao, C. L. W. Liu and D. Xu, “A Passive Optical Fiber Current Sensor Based on YIG,” 1st Asia-Pacific Optical Fiber Sensors Conference, Chengdu, 7-9 November 2008, pp. 1-4.

[8]   A. M. Smith, “Polarization and Magnetooptic Properties of Single-Mode Optical Fiber,” Applied Optics, Vol. 17, No. 1, 1978, pp. 52-56. doi:10.1364/AO.17.000052

[9]   A. Papp and H. Harms, “Polarization Optics of Liquid Core Optical Fibers,” Applied Optics, Vol. 16, No. 5, 1977, pp. 1315-1319. doi:10.1364/AO.16.001315

[10]   H. Schneider, H. Harms, A. Papp and H. Aulich, “Low- Birefringence Single-Mode Optical Fibers: Preparation and Polarization Characteristics,” Optical Society of America, Vol. 17, 1978, pp. 3035-3037.

[11]   A. K. Zvezdin and V. A. Kotov, “Modern Magnetooptics and Magnetooptical Materials,” CRC Press, Boca Raton, 1997. doi:10.1887/075030362X

 
 
Top