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TitleSmall deformation measurements of diffuse objects: Phase stepping by frequency drift of a He-Ne laser
Publication TypeJournal Article
Year of Publication1997
AuthorsHelg, T.L., Barnes T.H., and Haskell T.G.
JournalOptical Review
Pagination288 - 292
Date Published1997
ISSN13406000 (ISSN)
AbstractWe describe a simple phase-stepping speckle interferometer with large path difference, in which phase modulation is achieved by thermal frequency drift of the He-Ne light source. This system is easy to set up, requires no specialised components, is immune from the effects of piezo actuator hysteresis, and is capable of producing phase maps in which the noise is less than 1/20λ.

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