Patent ID: 9243893
Filing Date: 2016-01-26
CPC Classification: G01B,G01J,G06T

Claim Text:
1. A method of measuring the inside diameter of a hollow body of revolution ( 2 ) that is transparent or translucent and that is defined by an inside face ( 4 ) and an outside face ( 5 ), the body presenting an axis of revolution along a vertical axis (z), the method consisting in illuminating the hollow body ( 2 ) by means of a diffuse light source ( 9 ) that each point of the diffuse light source emits light in a multitude of directions and in recovering the light rays emerging from the hollow body ( 2 ) in order to form at least one image, and being characterized by: illuminating a region of the hollow body ( from the side of the hollow body that is opposite from its illuminated side, and by acting along an optical axis (y) that is perpendicular to the vertical axis (z) and perpendicular to the measurement axis (x), recovering the light rays that are reflected and refracted by the hollow body ( processing the image (J) so as to determine the distance along the measurement axis (x) between the two light transitions (T