1 October 1991 Optical system for automatic inspection of curved surfaces
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This paper describes an optical system, designed and realized by Officine Galileo, for contactless control of reflective and semireflective surfaces. LINESCAN optical system is based on dark field illumination, and it is able to detect scattered light from surface defects by means of a linear CCD array. A miniature composite prism combines the lighting and imaging channels, also providing dark field illumination and allowing access into very small cavities. LINESCAN is capable of detecting scratches, digs, rust stains and other similar defects, characterized by thickness greater than 10 microns, on spherical and toroidal surfaces. The system provides a fast restoration of the bidimensional surface defects image from a discrete set of mondimensional images. A stepping motor driven by a computer rotates the object. A typical industrial application of LINESCAN is the inspection of inner and outer ring races of ball bearings. LINESCAN allows substantial time saving in testing and assembling ball bearings.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stefano Livi, M. Magnani, Silvano Pieri, Andrea Romoli, "Optical system for automatic inspection of curved surfaces", Proc. SPIE 1500, Innovative Optics and Phase Conjugate Optics, (1 October 1991); doi: 10.1117/12.46823; https://doi.org/10.1117/12.46823

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