VOLTAGE AND ELECTRIC FIELD MEASURING DEVICE USING LIGHT

摘要

PURPOSE:To obtain a voltage/electric field measuring device using light which is stable to a temperature fluctuation, by turning an optical detector in the same direction with the same angle as the turnig direction of a polarization surface of an electro-optical crystel having an optical rotatory power. CONSTITUTION:A material having an optical rotatory power such as bismuth cilicon oxide or bismuth germanium oxide having excellent temperature characterisitics is used to an electro-optical crystal. A special relation is given to the size and angle between the electro-optical crystal and an optical detector. Then the optical detector is turned in the same direction with the same angle as the turning direction of a polarization surface of an electro-optical crystal 4 having an optical rotatory power. As a result, the temperature fluctuation can be reduced for the intensity of the output light due to the dependance on temperature of the half-wavelength voltage and the optical rotatory power. Thus a voltage/electric field measuring device using light is obtained with high stability to the temperature fluctuation.