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Peripheric Optics Tutorial

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Peripheric Optics Tutorial

http://www.opto-engineering.com/peripheric-optics-tutorial.html

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Peripheric Optics: 360° optics enables a complete object view with just onecamera
Numerous machine vision applications require a complete view of an object surface since many features to be inspected are located on the object sides rather than on its top. Most cylindrical objects such as bottles and containers of different types, as well as many kinds of mechanical parts require an inspection of the side surfaces to detect scratches and impurities or to read a barcode or,again, to ensure that some writings have been correctly printed. In cases like this, the most common approach is to use more cameras (usually 3 or 4) in order to achieve several side views of the part under inspection in addition to the standard top view. This solution, besides increasing the cost of the system, often leads to system performances limitation, since the electronics or software mustmanage different images coming from different cameras at the same time.

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23/02/2011 01:01 p.m.

Peripheric Optics Tutorialhttp://www.opto-engineering.com/peripheric-optics-tutorial.html

In many other cases, machine vision system engineers prefer to integrate a line camera to scan, line by line, the object outer surface. This approach also shows many technical and cost issues, since the object must be put in rotation by some expensive mechanism which will also affect the control speed; moreover, line-scan cameras require very powerful illuminationwhile the width of linear detectors increase the optical system magnification, thus reducing the field depth. For these reasons several integrators look for optical solutions allowing for single camera inspection without any need of part rotation. Different types of optical set-ups make this possible: Pericentric Lenses, Hole Inspection Optics, Multimirror systems and other kinds of optical probesand systems.

Optics for Outer Surface Inspection
A typical problem is how to inspect outer surfaces of a cylindrical object while it is moving on a conveyor: in cases like that, the other parts, following or preceding the object under inspection, could obstruct the side views provided by a multiple camera system and Pericentric Lenses are therefore the solution of choice. Pericentric Lenses...