Patent ID: 7864339
Filing Date: 2011-01-04
Classification: G01B

Abstract:
1. A method for the contactless measurement of a hollow three-dimensional object, thus having an internal wall, this object comprising an external layer and an internal layer, this object being translucent or transparent vis-á-vis visible light, this method being characterised in that: an image of the object is acquired by single-view backlit shadowgraphy, along a first viewing axis, by observing this object with visible light, this image comprising at least one luminous line, an equation is established that connects at least one optogeometric parameter of the object to at least one geometric parameter of the luminous line, this geometric parameter is determined, and the optogeometric parameter is determined by means of the equation and geometric parameter thus determined, in which a three-dimensional reconstruction is made of the internal wall of the object over an area that is close to the equator of this object, from the image of the object and the equation, this reconstruction supplying a first set of data, the thickness of the internal layer of the object is determined, a second set of data relating to the deformation of this internal layer is determined from the thickness thus determined, and a reconstruction of the entire internal wall of the object is carried out by means of the first and second sets of data.