Process for determining a dimension of an object
AssigneeCentre de Recherches Metallurgiques-Centrum voor Research in de Metallurgie
InventorRobert A. Pirlet
Life of this patent
Estimating the term…
Abstract
To determine a dimension of an object, two emitted beams whose axes define a known angle are directed by means of a deflector onto points of the object related to the dimension to be determined so that when one beam falls on the first of two points defining the dimension the other beam falls on the second point. Light rays reflected by the two points are received as two beams by means of a receiver. The angle of incidence of the emitted beam is measured with respect to a direction. The angles made respectively by the axes of the two received beams with the axes of the emitted beams are measured. The dimension is calculated from the angles.
Claims21
A process for determining a dimension of an object, comprising:
- directing two diverging emitted beams, whose axes define a known angle, by means of a deflector onto points of the object related to the dimension to be determined so that when one of these beams falls on the first of two points defining the dimension the other beam falls on the second point;
- receiving light rays reflected by the two points as two received beams, by means of a receiver;
- measuring, with respect to a reference direction, the angle of incidence of the emitted beams and the angles made respectively by the axes of the two received beams with the axes of the emitted beams;
- and calculating the dimension from the angles
A method of determining a dimension of an article, comprising the steps of:
- directing a beam at the article by means of a first mobile deflector and scanning the part of the profile of the article comprising the dimension to be measured;
- orientating rays reflected by the article in the direction of at least one receiver by means of a second mobile deflector;
- angularly moving the deflectors at different speeds;
- determining the positions occupied by two points related with the dimension to be measured;
- and
- calculating the dimension with respect to these points;
- and
- wherein during the time taken by one of said deflectors to scan one of the various parts of the profile of the article, the other one of said deflectors completely scans all of the said various parts of the profile of the article, the optical members being arranged one with respect to the other in such a way that the rays reflected by one of the various parts of the profile of the article remain substantially at the same abscissa of the linear receiver during scanning of the said part of the profile;
- and
- wherein two beams are simultaneously emitted, the axes of the beams forming a known angle therebetween, the two beams being directed at the points associated with the dimension to be determined so that when one of two beams strikes one of the two points defining the dimension, the second beam strikes the second point.
Dependencies are inferred from the claim text.