Electro-optical and magneto-optical sensing apparatus and...

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G01R 15/24 (2006.01) G01J 1/42 (2006.01) G01N 21/84 (2006.01) G01R 29/08 (2006.01) G01R 33/032 (2006.01) H04N 5/30 (2006.01) H04N 5/33 (2006.01)

Patent

CA 2255762

Apparatus and method for characterizing free-space electromagnetic energy, suitable for real-time two-dimensional far-infrared imaging applications. The sensing technique is based on a non-linear coupling between a low-frequency electric or magnetic field (12) and a laser beam (16) in an electro-optic or magnetic-optic crystal (14, 32 or 54). A counter-propagating sensing technique (Fig. 1), and a co-linear sensing technique (Figs. 4 and 13) are described for longer radiated and optical beam interaction length, making imaging applications practical.

L'invention concerne un dispositif et un procédé pour déceler le rayonnement électromagnétique dans l'espace libre, se prêtant aux applications d'imagerie bidimensionnelle en temps réel dans l'infrarouge lointain. La technique de détection repose sur un couplage non linéaire entre un champ électrique ou magnétique basse fréquence (12) et un faisceau laser (16) dans un cristal électro-optique ou magnético-optique (14, 32 ou 54). Outre une technique de détection à contre-propagation (Fig. 1), on décrit une approche de détection colinéaire (Figs. 4 et 13) offrant une plus grande longueur d'interaction entre le champ rayonné et le faisceau optique, ce qui facilite les applications d'imagerie.

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