NASA NTRS · 19950006335
Defocus Measurement Using a Liquid Crystal Point Diffraction Interferometer
Abstract
A liquid crystal PDI is demonstrated by measuring the defocus change between two positions of the interferometer. Errors caused by average intensity variations are discussed.
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Mercer, Carolyn R., Creath, Katherine. 1994-08-01. Defocus Measurement Using a Liquid Crystal Point Diffraction Interferometer. https://ntrs.nasa.gov/citations/19950006335
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