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A Comparison of Three Methods for Measuring Distortion in Optical Windows
Contributor(s): Nasa, National Aeronautics and Space Adm (Author)

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 ISBN: 1793988749     ISBN-13: 9781793988744
Publisher: Independently Published
OUR PRICE: $20.69  

Binding Type: Paperback
Published: January 2019
* Out of Print *
Additional Information
BISAC Categories:
- Science | Space Science
Physical Information: 0.09" H x 8.5" W x 11" L (0.27 lbs) 42 pages
 
Descriptions, Reviews, Etc.
Publisher Description:
It's important that imagery seen through large-area windows, such as those used on space vehicles, not be substantially distorted. Many approaches are described in the literature for measuring the distortion of an optical window, but most suffer from either poor resolution or processing difficulties. In this paper a new definition of distortion is presented, allowing accurate measurement using an optical interferometer. This new definition is shown to be equivalent to the definitions provided by the military and the standards organizations. In order to determine the advantages and disadvantages of this new approach, the distortion of an acrylic window is measured using three different methods: image comparison, moir interferometry, and phase-shifting interferometry. Youngquist, Robert C. and Nurge, Mark A. and Skow, Miles Kennedy Space Center NASA/TM-2015-218822, KSC-E-DAA-TN23489
 
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