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Proceedings Paper

Optical electric-power sensor using one Bi4Ge3O12 crystal
Author(s): Changsheng Li; Xiang Cui; Toshihiko T. Yoshino
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Paper Abstract

An optical electric-power sensor is proposed and experimentally carried out. Only one block of bismuth germanate crystal is utilized as the sensing element, which exhibits both the Faraday effect and the Pockels effect. The polarized light passing through the crystal can be modulated by the product signal of applied electric and magnetic fields, therefore, instantaneous electric power signal can be obtained when load current and load voltage are simultaneously applied to the sensing crystal by use of an air-cored coil and two plane electrodes. The active power and apparent power within 2000W(or VA) have been measured simultaneously under different power factors. The maximum relative errors are 2.7% for active power measurement and 1 .9% for apparent power measurement. The sensitivity and uncertainty ofthe sensing system are also discussed.

Paper Details

Date Published: 9 September 2002
PDF: 7 pages
Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002); doi: 10.1117/12.482006
Show Author Affiliations
Changsheng Li, Gunma Univ. (Japan)
Xiang Cui, North China Electric Power Univ. (China)
Toshihiko T. Yoshino, Gunma Univ. (Japan)

Published in SPIE Proceedings Vol. 4920:
Advanced Sensor Systems and Applications
Yun-Jiang Rao; Julian D. C. Jones; Hiroshi Naruse; Robert I. Chen, Editor(s)

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