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Proceedings Paper

Magneto-optical ac current sensing with an annealed fiber coil and intrinsic temperature compensation
Author(s): Peter Menke; Thomas Bosselmann
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Paper Abstract

Optical current sensors using the Faraday effect promise significant advantages over conventional current transformers. One of the remaining problems is the temperature dependence of the optical current measurement mainly caused by intrinsic or stress induced linear birefringence. By an appropriate annealing process most of the linear birefringence in a fiber coil can be removed. But still a significant temperature drift remains. For AC measurements we have developed a novel compensation method, which uses the DC part of the output signal to compensate the temperature drift. We have achieved a reduction in temperature sensitivity by a factor of 8 to about 0.5% over a temperature range from room temperature to 80 degree(s)C. The overall accuracy of the current sensor is now limited only by the system's noise and stability.

Paper Details

Date Published: 1 November 1994
PDF: 8 pages
Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); doi: 10.1117/12.191839
Show Author Affiliations
Peter Menke, Siemens AG (Germany)
Thomas Bosselmann, Siemens AG (Germany)

Published in SPIE Proceedings Vol. 2292:
Fiber Optic and Laser Sensors XII
Ramon P. DePaula, Editor(s)

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