Patent ID: 8654331

Claim:
An electromagnetic field measurement apparatus, comprising: a laser light source that emits time-multiplexed laser light of plurality of wavelengths different from one another; a polarized wave controller that linearly polarizes the laser light emitted from the laser light source; a plurality of optical fiber probes, each of which has an electrooptic material or a magnetooptic material at its leading end and in each of which the laser light reflected at the leading end is subjected to polarization modulation in accordance with an electric filed intensity or a magnetic field intensity at the leading end; an analyzer that converts the laser light reflected by each of the plurality of optical fiber probes into intensity modulated light; an optical circulator that outputs the laser light linearly polarized by the polarized wave controller to a multiplexer/demultiplexer and outputs the laser light input from the multiplexer/demultiplexer to the analyzer; and a multiplexer/demultiplexer that outputs the laser light input from the optical circulator to the plurality of respective optical fiber probes according to the wavelength of the laser light and outputs the laser light input from the plurality of respective optical fiber probes to the optical circulator, wherein the analyzer converts the laser light that is reflected by the optical probes, passed through the multiplexer/demultiplexer and the optical circulator into the intensity modulated light, and wherein the electooptic material or the magnetooptic material at the leading end of each of the plurality of optical fiber probes functions as a sole sensor of the optical fiber probe for measuring the electric field intensity or the magnetic field intensity at the leading end of the optical fiber probe.