Color-Coded Light-Sectioning Method
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Surface profiles 1 are determined at high speed by analyzing the local color reflected from the surface when the latter is illuminated across its diameter with a light beam 2 of oblique incidence and a stripe- like, continuous distribution of optical frequencies (colors). In the figure, a linear variation of the optical frequency between an upper value fo and a lower value fu is assumed in beam 2 (the frequency being constant in planes perpendicular to the drawing plane) so that a height shift of Wh at location x leads to an observable frequency shift for that location according to a linear function of Wh and a (the angle of beam incidence). In the figure, frequency f1 is observed at x instead of the expected frequency f2 for a plane surface 1.