9 September 2002 Optical electric-power sensor using one Bi4Ge3O12 crystal
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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.
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Changsheng Li, Xiang Cui, and Toshihiko T. Yoshino "Optical electric-power sensor using one Bi4Ge3O12 crystal", Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002); doi: 10.1117/12.482006; https://doi.org/10.1117/12.482006

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