Endoscopic surface topography using a laser-generated light cone

Jose A. Ferrari; Erna M. Frins; Arturo Lezama; Ramon Cote; German Da Costa

doi:10.1117/12.198844

6 January 1994 Endoscopic surface topography using a laser-generated light cone

Jose A. Ferrari, Erna M. Frins, Arturo Lezama, Ramon Cote, German Da Costa

Proceedings Volume 2348, Imaging and Illumination for Metrology and Inspection; (1994) https://doi.org/10.1117/12.198844
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

Abstract

An optical fiber is illuminated at a point (V) by a collimated laser beam forming an angle ((theta) ) with the fiber axis. A light cone (divergence 2(theta) , vertex V, axis coincident with the fiber) is thus generated. The 3D curve (C) resulting from intersection of the light cone with a given opaque surface is recorded by a CCD camera coaxial with the optical fiber. Numerical processing of the curve image allows determination of the polar coordinates (with origin at point V) of each point of curve (C). This device allows internal topographic inspection of concave surfaces. So it may be considered as the counterpart in polar coordinates of classic methods using lateral projection of a light plane to determine contour lines of convex surfaces in cartesian orthogonal coordinates. Applications of this method to inspection of the human bucal cavity shows strong influence of laser light diffusion within human tissue in the resolution of resulting images.

Citation Download Citation

Jose A. Ferrari, Erna M. Frins, Arturo Lezama, Ramon Cote, and German Da Costa "Endoscopic surface topography using a laser-generated light cone", Proc. SPIE 2348, Imaging and Illumination for Metrology and Inspection, (6 January 1994); https://doi.org/10.1117/12.198844

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