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Radius of Curvature Measurement of Large Optics Using Interferometry and Laser TrackerThe determination of radius of curvature (ROC) of optics typically uses either a phase measuring interferometer on an adjustable stage to determine the position of the ROC and the optics surface under test. Alternatively, a spherometer or a profilometer are used for this measurement. The difficulty of this approach is that for large optics, translation of the interferometer or optic under test is problematic because of the distance of translation required and the mass of the optic. Profilometry and spherometry are alternative techniques that can work, but require a profilometer or a measurement of subapertures of the optic. The proposed approach allows a measurement of the optic figure simultaneous with the full aperture radius of curvature.
Document ID
20110011965
Acquisition Source
Goddard Space Flight Center
Document Type
Other - NASA Tech Brief
External Source(s)
http://www.techbriefs.com/component/content/article/9710
Authors
Hagopian, John (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Connelly, Joseph (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
April 1, 2011
Publication Information
Publication: NASA Tech Briefs, April 2011
Subject Category
Technology Utilization And Surface Transportation
Report/Patent Number
GSC-15941-1
Distribution Limits
Public
Copyright
Public Use Permitted.

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IDRelationTitle20110011928Collected WorksNASA Tech Briefs, April 2011
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