Double-fiber electric current measurements applying thermal-lens-coupled magneto-optical effect in ferrofluid

Hongjie Li; Xiaowei Chen; Suihua Yuan

doi:10.1117/12.318171

13 August 1998 Double-fiber electric current measurements applying thermal-lens-coupled magneto-optical effect in ferrofluid

Hongjie Li, Xiaowei Chen, Suihua Yuan

Author Affiliations +

Proceedings Volume 3555, Optical and Fiber Optic Sensor Systems; (1998) https://doi.org/10.1117/12.318171
Event: Photonics China '98, 1998, Beijing, China

Abstract

The optical current transformer (OCT) reported in the past decades is mainly based on the traditional principle of Faraday rotation effect. Presented is a new type of OCT based on a new physical effect, the thermal lens coupled magneto-optical effect in ferrofluid. The use of optical array in the measuring system made the instrument complicated and expensive. This paper proposes applying double fibers to detect the current-corresponding variation of light intensity of the diffraction rings to simplify the instrumental structure. The fluctuations of the laser beam were eliminated by differential optical paths. Results obtained showed a DC measurement accuracy of 1 percent with a dynamic range of 0-500 angstrom, extendible to 2000 angstrom. All experiments were computerized. The set-up can also be applied to measure AC currents with similar qualities to the DC case.

Citation Download Citation

Hongjie Li, Xiaowei Chen, and Suihua Yuan "Double-fiber electric current measurements applying thermal-lens-coupled magneto-optical effect in ferrofluid", Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); https://doi.org/10.1117/12.318171

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