WIT Press


The Analysis Of The Form Of Aspheric Lens Surfaces

Price

Free (open access)

Paper DOI

10.2495/LAMDAMAP970341

Volume

16

Pages

10

Published

1997

Size

786 kb

Author(s)

J.W. McBride, M. Hill & M. Jung

Abstract

: Recent developments in high precision machining have allowed for the design and manufacture of precision aspheric lenses. These have the advantage over conventional spherical lenses in that a multiple element lens can be replaced by a single aspheric lens. There are however difficulties both in the measurement of the lens surface after machining and the assessment of the quality of the lens. In this paper an aspheric lens surface is measured using a 3D Form Talysurf. The data are then analysed using an analytical least-squares technique to fit the points to an exponential function. The methods developed show that the machining methods can now be complemented by an analysis technique. 1. Introduction When measuring an object in 3-dimensions a huge amount of dat

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