Influence of residual fiber birefringence and temperature on the high-current performance of an interferometric fiber-optic current sensor

Robert Wüest; Andreas Frank; Samuel Wiesendanger; Philippe Gabus; Urs E. Meier; Jürgen Nehring; Klaus Bohnert

doi:10.1117/12.820589

18 May 2009 Influence of residual fiber birefringence and temperature on the high-current performance of an interferometric fiber-optic current sensor

Robert Wüest, Andreas Frank, Samuel Wiesendanger, Philippe Gabus, Urs E. Meier, Jürgen Nehring, Klaus Bohnert

Author Affiliations +

Proceedings Volume 7356, Optical Sensors 2009; 73560K (2009) https://doi.org/10.1117/12.820589
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

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.

Citation Download Citation

Robert Wüest, Andreas Frank, Samuel Wiesendanger, Philippe Gabus, Urs E. Meier, Jürgen Nehring, and Klaus Bohnert "Influence of residual fiber birefringence and temperature on the high-current performance of an interferometric fiber-optic current sensor", Proc. SPIE 7356, Optical Sensors 2009, 73560K (18 May 2009); https://doi.org/10.1117/12.820589

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