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Proceedings Paper

Influence of residual fiber birefringence and temperature on the high-current performance of an interferometric fiber-optic current sensor
Author(s): Robert Wüest; Andreas Frank; Samuel Wiesendanger; Philippe Gabus; Urs E. Meier; Jürgen Nehring; Klaus Bohnert
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Paper Abstract

A highly accurate reflective interferometric fiber-optic current sensor for alternating and direct currents up to 500 kA is investigated. The magnetic field of the current introduces a differential phase shift between right and left essentially circularly polarized light waves in a fiber coil wound around the conductor. Technology adopted from fiber gyroscopes is used to measure the current-induced phase shift. The sensor achieves accuracy to within ±0.1% over at least two orders of magnitude of current and for temperatures from -40 to 80°C with inherent temperature compensation by means of a non-90°-retarder. The paper analyzes the influence of key parameters on the sensor accuracy as well as linearity as a function of magneto-optic phase shift. Particularly, we consider residual birefringence in the sensing fiber and its effect on the high-current performance of the sensor as well as optimum parameters for the temperature compensation scheme. Applications of the sensor are in high-voltage substations and in the electrolytic production of metals such as aluminum.

Paper Details

Date Published: 18 May 2009
PDF: 8 pages
Proc. SPIE 7356, Optical Sensors 2009, 73560K (18 May 2009); doi: 10.1117/12.820589
Show Author Affiliations
Robert Wüest, ABB Ltd. (Switzerland)
Andreas Frank, ABB Ltd. (Switzerland)
Samuel Wiesendanger, ABB Ltd. (Switzerland)
Philippe Gabus, ABB Ltd. (Switzerland)
Urs E. Meier, ABB Ltd. (Switzerland)
Jürgen Nehring, ABB Ltd. (Switzerland)
Klaus Bohnert, ABB Ltd. (Switzerland)

Published in SPIE Proceedings Vol. 7356:
Optical Sensors 2009
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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