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Proceedings Paper

Comparison of full-aperture interferometry to subaperture stitched interferometry for a large-diameter fast mirror
Author(s): Brian E. Catanzaro; James A. Thomas; Eri J. Cohen
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Paper Abstract

The Herschel Space Observatory (formerly known as FIRST) consists of a 3.5 m space telescope. Stitching sub aperture interferograms may offer considerable cost savings during testing of the flight telescope as compared to other techniques. A comparative demonstration is presented of interferogram stitching techniques that enable a composite map of a 3-D surface to be assembled from a sequence of sub-aperture measurements. This paper describes the fundamental procedures for stitching together component data sets and demonstrates such techniques with real data sets. A set of 14 sub-aperture measurements was made of a 2 m diameter all-composite mirror developed as part of the Herschel Space Observatory program and two different stitching software packages were employed to stitch together the sub-aperture surface maps. The software packages differ fundamentally in the way the sub-aperture maps are three-dimensionally stitched, one employing a local technique and the other using a global technique. The processed results from both algorithms are compared with each other and with a full-aperture reference measurement made of the same test optic. A summary of the results is presented and potential modifications and enhancements to the stitching techniques are discussed.

Paper Details

Date Published: 5 November 2001
PDF: 14 pages
Proc. SPIE 4444, Optomechanical Design and Engineering 2001, (5 November 2001); doi: 10.1117/12.447304
Show Author Affiliations
Brian E. Catanzaro, CFE Services (United States)
James A. Thomas, LightWorks Optics, Inc. (United States)
Eri J. Cohen, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 4444:
Optomechanical Design and Engineering 2001
Alson E. Hatheway, Editor(s)

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