Authors

Yann Gaeremynck, Gwenaël Gaborit, Lionel Duvillaret, Mickaël Ruaro and Frédéric Lecoche

Abstract

Based on an isotropic electro-optic crystal, a two-port pigtailed electro-optic sensor has been built. The probe allows to measure two orthogonal components of the ambient electric field. The sensor intrinsically presents a temperature-dependent free response. The two measured electric field components are orthogonal to the sensor revolution axis, leading to a transverse electro-optic probe. Magnitude and orientation of the electric field are measured simultaneously with an accuracy of 0.5 dB and 2°, respectively. The rejection of orthogonal components to the electric field vector reaches 30 dB.

Introduction

Electric (E) field measurement is of major interest for a wide variety of applications: target localisation, non destructive inspection, radiation patterns measurement, electromagnetic compatibility, and bioelectromagnetism. Usual antennas are unable to give true punctual polarimetric measurements. On the contrary, electro-optic (EO) sensors are endowed with huge bandwidths, small induced perturbation, and high spatial resolution to the detriment of a moderate sensitivity. Moreover, once pigtailed and temperature dependant free, EO sensors become very handy measurement tools. However, pigtailed EO sensors usually give access to a single E-field component. Even if a few groups have developed pigtailed EO sensors that are able to simultaneously measure two or three components of the E field, these sensors are using either several crystals or several laser probe beams, leading in turn to non-rigorous punctual measurements. We present here a pigtailed EO sensor consisting in a single isotropic EO crystal and a single laser probe beam. This transducer is able to simultaneously measure at the same location, the two E-field components lying in a plane perpendicular to its revolution axis. After setting out the theoretical background and the measurement set-up, we present the experimental validation of this 2-components 2-port EO sensor.

The EO sensor is based on a {111}-cut ZnTe crystal. Under applied electric field, the crystal, initially isotropic, becomes anisotropic …

Reference

0003-6951/2011/99(14)/141102/3 99, 141102-1 VC 2011 American Institute of Physics

 

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