Comparison of full-aperture interferometry to subaperture stitched interferometry for a large-diameter fast mirror

Brian E. Catanzaro; James A. Thomas; Eri J. Cohen

doi:10.1117/12.447304

5 November 2001 Comparison of full-aperture interferometry to subaperture stitched interferometry for a large-diameter fast mirror

Brian E. Catanzaro, James A. Thomas, Eri J. Cohen

Author Affiliations +

Proceedings Volume 4444, Optomechanical Design and Engineering 2001; (2001) https://doi.org/10.1117/12.447304
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

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Brian E. Catanzaro, James A. Thomas, and Eri J. Cohen "Comparison of full-aperture interferometry to subaperture stitched interferometry for a large-diameter fast mirror", Proc. SPIE 4444, Optomechanical Design and Engineering 2001, (5 November 2001); https://doi.org/10.1117/12.447304

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