Electrooptic probe for vector measurement of an...

Details Electrooptic probe for vector measurement of an... Electrooptic probe for vector measurement of an...

G - Physics

01

R

G01R 29/08 (2006.01) G01R 29/14 (2006.01)

Patent

CA 2655034

The invention relates to a device for measuring two components of an electromagnetic field in an analysis zone, said device comprising: a light source (7) sending a polarized light beam into a polarization-maintaining optical fibre (5), said beam being directed along one axis of the fibre; an isotropic electrooptic material (21) placed in said zone, receiving the beam from the optical fibre via a quarter-wave plate (22) having its axes oriented at an angle of 45° to the axes of the optical fibre and sending a beam into this fibre, this plate being slightly detuned as regards is characteristic or its orientation; means (13-14) for phase-shifting the beam sent into the fibre, which means are set so as to impose a phase shift (g) equal and opposite to that (q) imposed by the fibre; and means for analyzing the orientation and the ellipticity of the wave exiting the phase-shifting means.

L'invention concerne un dispositif de mesure de deux composantes d'un champ électromagnétique dans une zone d'analyse, comprenant une source lumineuse (7) envoyant dans une fibre optique à maintien de polarisation (5) un faisceau lumineux polarisé selon un axe de la fibre; un matériau électro-optique isotrope (21) disposé dans ladite zone, recevant le faisceau de la fibre optique par l'intermédiaire d'une lame quart d'onde (22) ayant ses axes orientés à un angle de 45° des axes de la fibre optique et renvoyant un faisceau dans cette fibre, cette lame étant légèrement déréglée quant à sa caractéristique ou à son orientation; des moyens (13-14) de déphasage du faisceau renvoyé dans la fibre réglés pour imposer un déphasage (.gamma.) égal et opposé à celui (.theta.) imposé par la fibre; des moyens d'analyse de l'orientation et de l'ellipticité de l'onde sortant des moyens de déphasage.

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