Electro-optic voltage sensor with Multiple Beam Splitting

Details Electro-optic voltage sensor with Multiple Beam Splitting Electro-optic voltage sensor with Multiple Beam Splitting

1997-06-06

2000-09-26

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

G01R 3100

Patent

active

061247065

ABSTRACT:
A miniature electro-optic voltage sensor system capable of accurate operation at high voltages without use of the dedicated voltage dividing hardware. The invention achieves voltage measurement without significant error contributions from neighboring conductors or environmental perturbations. The invention employs a transmitter, a sensor, a detector, and a signal processor. The transmitter produces a beam of electromagnetic radiation which is routed into the sensor. Within the sensor the beam undergoes the Pockels electro-optic effect. The electro-optic effect produces a modulation of the beam's polarization, which is in turn converted to a pair of independent conversely-amplitude-modulated signals, from which the voltage of the E-field is determined by the signal processor. The use of converse AM signals enables the signal processor to better distinguish signal from noise.
The sensor converts the beam by splitting the beam in accordance with the axes of the beam's polarization state (an ellipse) into at least two AM signals. These AM signals are fed into a signal processor and processed to determine the voltage between a ground conductor and the conductor on which voltage is being measured.

REFERENCES:
patent: 4564754 (1986-01-01), Sato et al.
patent: 4584470 (1986-04-01), Iizuka et al.
patent: 5113131 (1992-05-01), Cooper et al.
patent: 5446381 (1995-08-01), Okajima et al.
Minyu, Yao, et al, "Modifications of Optical Fiber Voltage Sensor,", CH2866-2/90/0000-109 S.100, 1990 IEEE, pp. 109-110. (unavailable month).

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