Patent ID: 9568506
Date: 2017-02-14
CPC Classifications: A61B,G01R,G02F,H04B

Claim:
1. An electric field measurement device for measuring an electric field of a measurement target, comprising: an optical waveguide configured to transmit transmission light; an electrode portion configured to give optical characteristics of the optical waveguide a periodic variation; an antenna configured to set a first state, in which the electric field is coupled to the optical waveguide, and a second state, in which the electric field is disconnected from the optical waveguide; a detector configured to detect light intensity of emission light emitted from the optical waveguide; and an applicator which applies a voltage to the electrode portion to give the periodic variation, wherein the applicator includes a setting portion, which sets a reference voltage in correspondence to the light intensity under the second state, and an output portion, which outputs a voltage in correspondence to a difference between the reference voltage and an induced voltage happening to the electrode portion under the first state.