A novel optoelectronic set up based on a confocal extended field proprietary design has been developed for high resolution 3D surface sensing as well as for roughness and surface flaw characterization.
The classical optical sectioning property of the basic confocal imaging design assumes that a monochromatic light beam is propagating forth and back from the elementary point source to the spatial filtering pinhole. When using a polychromatic light source, the residual chromatic aberration of the optical system reduces the optical sectioning global performance by enlarging the axial resolution (optical sectioning) by a quantity almost equal to the length of the axial chromatic aberration.
When dealing with 3D surface sensing of the axial chromatic aberration can be considered as generating a highly accurate axial color coding, provided that an adequate color decoding of the backreflected light beam is realized.
Consequently, it appears that it is possible to design customized confocal extended field point sensors with depths of field ranging from a few tens of microns (with subnanometric axial resolution) up to tens of millimeters (with micrometric axial resolution).
Owing to the large Numerical Aperture of the confocal imaging set up perfectly specular optical surfaces can be easily captured with this type of instrument. Examples of Metrological 3D surface sensing of aspheric ophtalmic progressive lenses, small lens arrays and MOEMS will be presented and discussed.
A novel optoelectronic setup based on a quasi confocal, z- axis extended field, proprietary design has been developed for High Resolution Non Contact 3D Surface Metrology including roughness characterization and surface flaw detection.
The design of this equipment based on the use of nineteen 500 mW laser diodes is presented. The Beacon is a powerful and collimated optical source based upon semi-conductor lasers. This equipment is implemented in the SILEX GEO2 terminal and its function is to provide a continuous wave light beam towards the LEO or GEO1 satellites during the acquisition phases. The design was experimentally validated with a functional breadboard, and test results demonstrated the feasibility of every performance required by the SILEX system.
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