Image defects from surface and alignment errors in grazing incidence telescopes

Timo T. Saha

doi:10.1117/12.55727

1 October 1990 Image defects from surface and alignment errors in grazing incidence telescopes

Timo T. Saha

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Optical Engineering, Vol. 29, Issue 10, (October 1990). https://doi.org/10.1117/12.55727

Abstract

The rigid body motions and low frequency surface errors of grazing incidence Wolter telescopes are studied. The analysis is based on surface error descriptors proposed by Paul Glenn [Opt. Eng. 23(4), 384-390 (1984)1. In his analysis, the alignment and surface errors are expressed in terms of Legendre-Fourier polynomials. Individual terms in the expression correspond to rigid body motions (decenter and tilt) and low spatial frequency surface errors of mirrors. With the help of the Legendre-Fourier polynomials and the geometry of grazing incidence telescopes, exact and approximated first order equations are derived in this paper for the cornponents of the ray intercepts at the image plane. These equations are then used to calculate the sensitivities of Wolter type I and II telescopes for the rigid body motions and surface deformations. This theory also provides a tool to predict how rigid body motions and surface errors of the mirrors compensate each other.

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Timo T. Saha "Image defects from surface and alignment errors in grazing incidence telescopes," Optical Engineering 29(10), (1 October 1990). https://doi.org/10.1117/12.55727

Published: 1 October 1990

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