Apparatus with a retracing optical circuit for the...

G - Physics – 01 – D

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G01D 5/34 (2006.01) G01R 15/24 (2006.01)

Patent

CA 2268913

Apparatus for the measurement of physical quantities, of the type using an optical transducer to transform the variations of a physical quantity or perturbation in a variation of the state of polarization of a polarized light beam, in which: the transducer (38; 48A; 58A; 68; 78) is inserted in an optical circuit (I), provided with polarizing beam-splitters (33A, 33B; 43A; 43B; 53A; 53B; 63A; 63B; 73A; 73B) for splitting the light beam in components having different state of polarization and to launch them along a first optical path (A) and a second optical path (B), being different to each other, which are recombined in further polarizing beam-splitters (33A, 33B; 43A; 43B; 53A; 53B; 63A; 63B; 73A; 73B) arranged at the output of the optical circuit (I); at the output of the optical circuit (I) a reflector element (6; 16; 36; 76) is provided, that reflects the light beam back into the optical circuit (I) with a different state of polarization.

Appareil permettant de mesurer des quantités physiques, cet appareil étant du type dans lequel un transducteur optique sert à transformer les variations d'une quantité ou d'une perturbation physique en une variation de l'état de polarisation d'un faisceau de lumière polarisée. Dans cet appareil, le transducteur (38; 48A; 58A; 68; 78) est introduit dans un circuit optique (1) doté de diviseurs de faisceaux polarisants (33A, 33B; 43A; 43B; 53A; 53B; 63A; 63B; 73A; 73B) pour diviser le faisceau de lumière en constituants ayant un état de polarisation différent et pour les envoyer sur un premier chemin optique (A) et sur un deuxième chemin optique (B), différents l'un de l'autre, sont recombinés dans d'autres diviseurs de faisceaux polarisants (33A, 33B; 43A; 43B; 53A; 53B; 63A; 63B; 73A; 73B) placés à la sortie du circuit optique (I). A la sortie du circuit optique (I), ledit appareil comporte un réflecteur (6; 16; 36; 76) pour réfléchir et renvoyer le faisceau de lumière dans le circuit optique (I) avec un état de polarisation différent.

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