G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 11/16 (2006.01) G01L 11/02 (2006.01)
Patent
CA 2331017
This invention refers to a differential transducer for measuring the curvature variations of a surface such as a surface of a diaphragm (5). According to the invention it comprises: an assembly of two L-shaped optical elements (6, 7) whose first legs (8) are intended to be mounted on the surface in such a way that the outer faces of both second legs (9), which face each other and which are made from transparent material, extend substantially in parallel to each other and at a right angle away from said surface, an optical cavity (19) being defined there-between, a laser source (17) whose beam (16) is intended to be directed parallelly to said surface onto said assembly and perpendicularly to the outer faces of said second legs (9), and a photodetector (18) disposed to receive said beam after having passed through said cavity (19) and said optical elements (6, 7), each optical element being provided with three support tips (10, 11, 12) which are firmly applied against said surface and which are arranged at the corners of an equilateral triangle whose symmetry axis is parallel to the beam (16) axis, the support tip (10) on the symmetry axis being located close to the second leg (9). This invention has been conceived for differential pressure measurements between two sides of a diaphragm.
Ce transducteur différentiel sert à mesurer les variations de courbure d'une surface, celle d'une membrane (5) par exemple. Il comporte un ensemble de deux éléments optiques en forme de L (6, 7) dont les premiers bras (8) sont destinés à être montés sur la surface de telle manière que les faces extérieures des seconds bras (9), qui se font face et sont fait d'un matériau transparent, s'étendent quasiment parallèlement l'une à l'autre et à angle droit par rapport à ladite surface, une cavité optique (19) étant ménagée entre elles. Il comporte également une source laser (17) dont le faisceau (16) est à diriger parallèlement à ladite surface sur l'ensemble susmentionné et perpendiculairement aux faces extérieures des seconds bras (9). Il comporte, de surcroît, un photodétecteur (18), placé de manière à recevoir le faisceau après le passage de celui-ci dans la cavité optique (19) et sa traversée des éléments optiques (6, 7). Chaque élément optique est pourvu de trois têtes support (10, 11, 12) fortement appuyées contre la surface et installées aux sommets d'un triangle équilatéral dont l'axe de symétrie est parallèle à l'axe du faisceau (16), la tête de support (10) située sur l'axe de symétrie se trouvant à proximité du second bras (9). Cette invention a pour objectif de permettre l'exécution de mesures de pression entre les deux faces d'une membrane.
Coutsomitros Constantin
Koltsakis Efthymios
European Community (ec)
Robic
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