Voltage sensor for use in optical power transformer including a pair of Pockels cells
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHidenobu Hamada
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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.
Claims12
A voltage sensor comprising
- a first polarizer for polarizing an incident light;
- a first Pockels cell disposed next to said first polarizer, said first Pockels cell receiving a voltage proportional to a voltage to be detected;
- a second Pockels cell disposed next to said first Pockels cell and having a set angle equal to that of said first Pockels cell, said second Pockels cell receiving a modulation voltage, said modulation voltage repeating a periodic and linear variation with a frequency higher than that of said voltage received by said first Pockels cell;
- a second polarizer disposed next to said second Pockels cell;
- and
- a signal analyzer disposed to receive an output light passing through said second polarizer, said analyzer detecting said voltage applied to said first Pockels cell based on a phase change in the intensity of said output light.
A voltage sensor comprising
- a first polarizer for polarizing an incident light;
- a first Pockels cell disposed next to said first polarizer, said first Pockels cell receiving a modulation voltage;
- a second Pockels cell disposed next to said first Pockels cell and having a set angle equal to that of said first Pockels cell, said second Pockels cell receiving a voltage proportional to a voltage to be detected;
- said modulation voltage repeating a periodic and linear variation with a frequency higher than that of said voltage received by said second Pockels cell;
- a second polarizer disposed next to said second Pockels cell;
- and
- a signal analyzer disposed to receive an output light passing through said second polarizer, said analyzer detecting said voltage applied to said second Pockels cell based on a phase change in the intensity of said output light.
Dependencies are inferred from the claim text.