G - Physics – 01 – M
Patent
G - Physics
01
M
G01M 11/02 (2006.01) G01N 21/45 (2006.01) G01N 30/74 (2006.01)
Patent
CA 2126245
Process for measurement of the difference between the refraction indexes of two media, each crossed by a light beam. Said beams are capable of generating an interference figure consisting of fringes, the shift of the latter being measured. According to the invention, a single means is used to detect the shift of said fringes. A phase modulation is applied to at least one of the beams and the modulation is controlled so as to shift said fringes.
L'invention concerne la mesure de la différence entre des indices de réfraction de deux milieux, chacun traversé par un faisceau lumineux, lesdits faisceaux étant susceptibles de donner naissance à une figure d'interférence constituée de franges dont on mesure le déplacement. Selon l'invention, on utilise un unique moyen pour détecter le déplacement des franges de la figure d'interférence, on réalise une modulation de phase sur l'un au moins des faisceaux et on contrôle la modulation afin d'obtenir un glissement des franges de la figure d'interférence.
Beauducel Claude
Couillard Francois
Frot Didier
Gonzalez Pierre
Couillard Francois
Institut Francais Du Petrole
Robic
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