Linear signal isolator and calibration circuit for electronic cu

Details Linear signal isolator and calibration circuit for electronic cu Linear signal isolator and calibration circuit for electronic cu

1976-12-27

1978-01-24

Murray, Richard

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

324 96, H04B 900

Patent

active

040705722

ABSTRACT:
An optical data transmission system for use with current sensors on ac high voltage transmission lines comprises a light-emitting diode transmitter at line potential and a silicon photodiode receiver at ground potential. Signals are conducted from the transmitter to receiver along a fiber optic light pipe. A silicon photodiode in a feedback configuration produces a linear ac output light from the light-emitting diode in response to line current. A dc reference signal is superimposed on the ac current data signal to provide system gain calibration. The dc signal is utilized, in a feedback loop, to control the gain of an ac signal amplifier in the receiver and to thus stabilize system calibration.

REFERENCES:
patent: 3506833 (1970-04-01), Von Willisen
patent: 3968361 (1976-07-01), Bumgardner

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