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Measuring the In-Process Figure, Final Prescription, and System Alignment of Large Optics and Segmented Mirrors Using Lidar MetrologyThe fabrication of large optics is traditionally a slow process, and fabrication capability is often limited by measurement capability. W hile techniques exist to measure mirror figure with nanometer precis ion, measurements of large-mirror prescription are typically limited to submillimeter accuracy. Using a lidar instrument enables one to measure the optical surface rough figure and prescription in virtuall y all phases of fabrication without moving the mirror from its polis hing setup. This technology improves the uncertainty of mirror presc ription measurement to the micron-regime.
Document ID
20120000458
Acquisition Source
Goddard Space Flight Center
Document Type
Other - NASA Tech Brief
Authors
Ohl, Raymond
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Slotwinski, Anthony
Eegholm, Bente
(Space Telescope Science Inst. Baltimore, MD, United States)
Saif, Babak
(Space Telescope Science Inst. Baltimore, MD, United States)
Date Acquired
August 25, 2013
Publication Date
September 1, 2011
Publication Information
Publication: NASA Tech Briefs, September 2011
Subject Category
Instrumentation And Photography
Report/Patent Number
GSC-15988-1
Distribution Limits
Public
Copyright
Public Use Permitted.
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