Voltage sensor for use in optical power transformer including a

Details Voltage sensor for use in optical power transformer including a Voltage sensor for use in optical power transformer including a

1993-11-16

1995-12-19

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324117R, G01R 3100

Patent

active

054771340

ABSTRACT:
A voltage sensor is composed by arranging along the optic axis, successively from the side of incident light, a first polarizer, a Pockels cell for detection, a Pockels cell for modulation, and a second polarizer wherein an electric field proportional to a voltage to be measured is applied to the Pockels cell for detection, and a periodic electric field for modulation that varies the phase difference by 2n.pi. radians, where n is a positive integer, during each period and that has a frequency higher than the electric field applied to the Pockels cell for detection is applied to the Pockels cell for modulation, and the voltage to be measured is determined based on a phase change in the intensity of the light output from the second polarizer.

REFERENCES:
patent: 3584949 (1971-06-01), Del Carlo et al.
patent: 4629323 (1986-12-01), Matsumoto
patent: 5111135 (1992-05-01), Kozuka et al.
patent: 5134361 (1992-07-01), Pillow
patent: 5153427 (1992-10-01), Takahashi et al.
IEEE Transaction on Power Delivery, vol. 5, No. 2, Apr. 1990, pp. 884-891, "Development of Optical Instrument Transformers", T. Sawa et al.
Proceed IEE, vol. 125, No. 10, Oct. 1978, pp. 935-941, "Noise Reduction in Optical Measurement Systems", A. M. Smith.

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