Orthogonal polynomials and tolerancing

John R. Rogers

doi:10.1117/12.896109

12 September 2011 Orthogonal polynomials and tolerancing

John R. Rogers

Proceedings Volume 8131, Optical System Alignment, Tolerancing, and Verification V; 81310D (2011) https://doi.org/10.1117/12.896109
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

Previous papers have established the inadvisability of applying tolerances directly to power-series aspheric coefficients. The basic reason is that the individual terms are far from orthogonal. Zernike surfaces and the new Forbes surface types have certain orthogonality properties over the circle described by the "normalization radius." However, at surfaces away from the stop, the optical beam is smaller than the surface, and the polynomials are not orthogonal over the area sampled by the beam. In this paper, we investigate the breakdown of orthogonality as the surface moves away from the aperture stop, and the implications of this to tolerancing.

Citation Download Citation

John R. Rogers "Orthogonal polynomials and tolerancing", Proc. SPIE 8131, Optical System Alignment, Tolerancing, and Verification V, 81310D (12 September 2011); https://doi.org/10.1117/12.896109

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