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Proceedings Paper

Double-fiber electric current measurements applying thermal-lens-coupled magneto-optical effect in ferrofluid
Author(s): Hongjie Li; Xiaowei Chen; Suihua Yuan
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Paper 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.

Paper Details

Date Published: 13 August 1998
PDF: 4 pages
Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); doi: 10.1117/12.318171
Show Author Affiliations
Hongjie Li, Xi'an Jiaotong Univ. (China)
Xiaowei Chen, Southwest China Normal Univ. (China)
Suihua Yuan, Southwest China Normal Univ. (China)


Published in SPIE Proceedings Vol. 3555:
Optical and Fiber Optic Sensor Systems
Shanglian Huang; Kim D. Bennett; David A. Jackson, Editor(s)

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