초록 ▼

An electric field detector which comprises means for generating a linearly polarized light, a polarizing element including a ) Pockels cell made from a Z-cutting quartz which transmits the polarized light toward a Z-direction and changes the phase difference of two light components of a crystal in r

An electric field detector which comprises means for generating a linearly polarized light, a polarizing element including a ) Pockels cell made from a Z-cutting quartz which transmits the polarized light toward a Z-direction and changes the phase difference of two light components of a crystal in response to the magnitude of the electric field strength. The electric field detector of the invention can be widely used in measuring conditions of an electrical machine.

대표청구항 ▼

An electric field detector comprising: (a) an electric field generating means for generating an electric field, (b) a light source for generating light, (c) an electric field detecting means for detecting change of electric field strength in said electric field generating means, (d) a photoelectric

An electric field detector comprising: (a) an electric field generating means for generating an electric field, (b) a light source for generating light, (c) an electric field detecting means for detecting change of electric field strength in said electric field generating means, (d) a photoelectric converting means for converting an output light signal from said electric field detecting means to an electric signal, (e) a discriminating means for discriminating changes in the electric field strength of the electric field generating means, and (f) said electric field detecting means being provided in the vicinity of said electric field generating means, said electric field detecting means optically connected to both said light source and said photoelectric converting means, and said discriminating means being electrically connected to said photoelectric converting means, (g) said electric field detecting means comprising an electric field-sensitive means for transmitting linearly polarized light from said light source in a Z-direction and/or approximately in a Z-direction of a quartz crystal and for changing the phase difference between two specific oscillations in said quartz crystal, and (h) said electric field-sensitive means comprising a Pockels cell made from Z-cut quartz and/or approximately-z-cut quartz.