Patent ID: 6479979
Filing Date: 2002-11-12
Classification: G01R

Abstract:
An opto-electric device for measuring the root mean square value of an alternating current voltage comprising:a) an electric field-o-light-to-voltage converter comprising: 1) a light source; 2) an electro-optic material: (a) receiving light from said light source; (b) modulating said light; and (c) providing a modulated light output; 3) an electric field applied to said electro-optic crystal to modulate said light from said light source to produce said modulated light output; b) an optical receiver for receiving and converting said modulated output light from said electro-optic material to a first voltage that is proportional to a square of said electric field applied to said electro-optic material; c) anaverager circuit receiving said first voltage and providing a second voltage that is proportional to the average of said square of said electric field over a period of time; and d) an inverse ratiometric circuit receiving said second voltage from said averager circuit and returning a third voltage that is an inverse voltage of said second voltage to said electric field-to-light-to-voltage converter to produce an output voltage that is the root mean square voltage of said applied electric field.