Method for checking an object made of transparent material and corresponding checking system
AssigneeMarposs Societa' Per Azioni
InventorsMaurizio Dalla Casa, Marco Montecchi
Life of this patent
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Abstract
Method for checking the surface and/or shape of at least one surface, or part thereof, of an object made of transparent material, by means of a checking system which comprises a light source, a sensor and a processing unit connected to the sensor. By an appropriate positioning of the light source and sensor it is possible to overcome the problem of multiple reflections and to identify in a unique manner the rays scattered from the surface to be checked and received by the sensor which are useful for the purposes of checking. According to one of the embodiments, it is also possible to determine the thickness of the object to be checked.
Claims16
A method for checking an object made of a transparent material defining at least a first surface and a second surface, which delimit a thickness, by means of a checking system comprising a light source, a sensor defining an optical axis and a processing unit connected to said sensor, the method comprising the following steps, not necessarily in that order:
- emitting, by means of the light source, a light blade defining a plane of illumination substantially perpendicular to said first surface,
- positioning said sensor facing said first surface in such a way that the optical axis forms a specified angle with the plane of illumination,
- detecting, among a plurality of rays scattered by said at least a first surface and a second surface, the scattered rays that are received at the optical axis of the sensor,
- generating, on the basis of the detected scattered rays, a plurality of light traces corresponding to the profiles of said at least a first surface and a second surface, and
- associating the profile of one of said at least a first surface and a second surface to a trace which lies in a predetermined position with respect to the other traces.
A checking system for checking an object made of a transparent material defining at least a first surface and a second surface, which delimit a thickness, the system comprising:
- a light source,
- a sensor defining an optical axis, and
- a processing unit connected to said sensor,
- wherein
- the light source emits a light blade that defines a plane of illumination substantially perpendicular to said first surface;
- and
- the sensor is positioned facing said first surface in such a way that the optical axis forms a defined angle with the plane of illumination, receives and detects, at said optical axis, rays scattered by said at least a first surface and a second surface and send an electric signal,
- the processing unit being adapted to generate, on the basis of the detected scattered rays, images of a plurality of light traces corresponding to the profiles of said at least a first surface and a second surface, and to associate the profile of one of said at least a first surface and a second surface to a trace which lies in a predetermined position with respect to the other traces.
Dependencies are inferred from the claim text.