Optical D.C. electric-field measuring apparatus with optic sensing means exhibiting both electrooptic and photoelectric effects

摘要

An electric-field measuring apparatus utilizing electrooptic effect for measuring the intensity of an electric DC field includes a material exhibiting both electrooptic effect and photoelectric effect or both a material exhibiting the electrooptic effect and a material exhibiting the photoelectric effect which material or materials are irradiated with a continuous light ray of a wavelength capable of inducing the electrooptic effect and an intermittently interrupted light ray of a wavelength capable of inducing the photoelectric effect.