Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1995-08-11
1997-06-03
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324117R, G01R 33032, G01R 1900
Patent
active
056358296
ABSTRACT:
In an optical unit (a), a first polarizer, a first light wave phase modulator (a Pockels device), a second light wave phase modulator, and a second polarizer are arranged in this sequence. A voltage to be measured is applied to the first light wave phase modulator. A control modulation voltage which has a frequency higher than that of the voltage to be measured is applied to the second light wave phase modulator. A signal processing unit (b) consists of: an O/E converter which converts the intensity of light output from the optical unit (a) into an electric signal; a phase shifter which shifts the phase of the control modulation voltage applied to the second light wave phase modulator by .pi./2 radians; an adder 16 which adds an output of the O/E converter 17 to that of the phase shifter 15; and a demodulator c which demodulates output of the adder 16.
REFERENCES:
patent: 4079429 (1978-03-01), Travot et al.
patent: 5477134 (1995-12-01), Hamada
A. Jaecklin et al., "Measuring Current at Extra-High Voltage", LASER FOCUS, vol. 6, No. 5, pp. 35-38, May 1970.
A. Smith et al., "Noise Reduction In Optical Measurement Systems", Proceedings of the Institution of Electrical Engineers, vol. 125, No. 10, pp. 935-941, Oct. 1978 European Search Report dated Jan. 17, 1997.
Karlsen Ernest F.
Matsushita Electric - Industrial Co., Ltd.
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