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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 6, Iss. 10 — Oct. 1, 1967
  • pp: 1707–1714

Lloyd Interferometer Applied to Flatness Testing

P. H. Langenbeck  »View Author Affiliations


Applied Optics, Vol. 6, Issue 10, pp. 1707-1714 (1967)
http://dx.doi.org/10.1364/AO.6.001707


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Abstract

Lloyd’s mirror experiment is applied to testing flatness of large surfaces. Because of the grazing incidence, even rough surfaces provide the characteristic interference pattern. In the case of a perfectly flat surface, that pattern consists of narrowly and equally spaced two beam interference fringes. Departures from flatness are reflected in changes of the fringe spacing. Moiré techniques are used for visualizing and measuring these changes in the deviation from straightness of the moiré fringes. Qualitative examples are given.

© 1967 Optical Society of America

History
Original Manuscript: May 31, 1967
Published: October 1, 1967

Citation
P. H. Langenbeck, "Lloyd Interferometer Applied to Flatness Testing," Appl. Opt. 6, 1707-1714 (1967)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-6-10-1707

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