Showing papers by "Alberto Cordero-Dávila published in 1986"
TL;DR: This method is based on the method of continuum least squares to obtain the vertex’s curvature and conic Constant of the fitted conic on-axis, given the curvature at the vertex and the conic constant of the parent conic from where the authors want the section and the size of that section.
Abstract: To help in the fabrication of off-axis conic sections, we present a method to approximate this off-axis section by an on-axis conic centered on the portion desired. This method is based on the method of continuum least squares to obtain the vertex’s curvature and conic constant of the fitted conic on-axis, given the curvature at the vertex and the conic constant of the parent conic from where we want the section and the size of that section. Simple analytic expressions for the curvature and conic constant are derived in terms of the parameters of the off-axis section.
26 citations
TL;DR: Using a technique that was previously developed for measuring the radius of curvature of spherical surfaces, an alternative method for testing cylindrical as well as toric lenses is presented.
Abstract: Using a technique that was previously developed for measuring the radius of curvature of spherical surfaces, an alternative method for testing cylindrical as well as toric lenses is presented. The basic equipment required is a nodal bench and a low power He–Ne laser.
17 citations