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20 May 2019 Parametric geometry analysis for circular-aperture off-axis parabolic mirror segment
Jeong-Yeol Han, Sukmock Lee, Dae Wook Kim
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Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 5, Issue 2, 024010 (May 2019). https://doi.org/10.1117/1.JATIS.5.2.024010
Abstract
We investigated the geometrical characteristics of circular-aperture off-axis parabolic (OAP) mirror segments to clarify the meaning of the loosely defined word “center” used in the literature and in documents to describe OAPs. We proposed the elliptical aperture center of an OAP as the definition of the center. The off-axis distance (OAD) is the vertical distance from the reference optical axis to the aperture center. In addition, the OAD can be varied depending on the desired center of a circular aperture to select the part of a parallel beam for focusing. The radius of the circular aperture becomes the minor-axis semidiameter of the elliptical aperture of the OAP. These geometrical parameters were systematically defined, derived, and/or analyzed in the context of optical engineering applications. Based on a set of those fundamental parameters, an intrinsic datum point utilizing the deepest point on the OAP surface was presented. The datum point provides a well-defined reference co-ordinate frame for locating or aligning an OAP within various astronomical telescope designs, instrument manufacturing and assembly processes, and optical system alignment and testing applications.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Jeong-Yeol Han, Sukmock Lee, and Dae Wook Kim "Parametric geometry analysis for circular-aperture off-axis parabolic mirror segment," Journal of Astronomical Telescopes, Instruments, and Systems 5(2), 024010 (20 May 2019). https://doi.org/10.1117/1.JATIS.5.2.024010
Received: 22 January 2019; Accepted: 26 April 2019; Published: 20 May 2019
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KEYWORDS
Mirrors
Off axis mirrors
Optics manufacturing
Astronomical telescopes
Astronomy
Optical alignment
Optical engineering
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