Patent ID: 7769250

Claim:
A device for measuring an electromagnetic field and the temperature in an analysis area, comprising: a light source for sending into a polarization-maintaining optical fiber a light beam polarized along an axis of the fiber; an anisotropic electro-optical material arranged in said area, for receiving the beam from the optical fiber and sending back the beam into the fiber; optical controlled means for shifting the phase of the beam sent back into the fiber thereby transforming an elliptical incident wave into a rectilinear wave; means for analyzing the intensity of said rectilinear wave; a quarter-wave plate, inserted between the optical fiber and said anisotropic electro-optical material, having its axes oriented at substantially 45 degrees with respect to the axes of the optical fiber, and means for determining the variations of an orientation of said rectilinear wave at the output of the phase-shift means.