Remote current sensor

Details Remote current sensor Remote current sensor

1981-02-26

1983-03-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324 96, G01R 3100

Patent

active

043762476

ABSTRACT:
To detect a change of current flow in a conductor, a current transformer is coupled to the conductor for generating a voltage corresponding to the rate of current change. A liquid crystal device is connected to the transformer and its optical state changes when the transformer generates a voltage. The liquid crystal device is incorporated in a fiber optic circuit illuminated at one end for controlling the light emission from the other end. If the monitored circuit carries direct current, the light emission will change state briefly when the current is turned on and off or makes other rapid changes. Where the monitored circuit carries alternating current, the emitted light will be on or off depending on whether the alternating current is on or off.

REFERENCES:
patent: 4070572 (1978-01-01), Summerhayes
patent: 4329580 (1982-05-01), Riley et al.

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