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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 27, Iss. 22 — Nov. 15, 1988
  • pp: 4631–4637

Range sensing by shearing interferometry: influence of speckle

Gerd Häusler and Jürgen M. Herrmann  »View Author Affiliations


Applied Optics, Vol. 27, Issue 22, pp. 4631-4637 (1988)
http://dx.doi.org/10.1364/AO.27.004631


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Abstract

We discuss the limits of optical range sensing by shearing interferometry for diffusely reflecting objects. The basic principle is the following: the radius of a wave that is scattered at the object under test is measured by shearing interferometry. This radius is the desired distance. We show that the limits of the method are mainly determined by speckle. With coherent light depth resolution cannot be increased considerably beyond the Rayleigh depth of focus. With partially coherent light a rms depth resolution of 68 μm at a distance of 380 mm (1:5500) was achieved. This resolution is 25 times better than the Rayleigh limit. The working aperture is very small (0.013); shading problems are minimized.

© 1988 Optical Society of America

History
Original Manuscript: March 15, 1988
Published: November 15, 1988

Citation
Gerd Häusler and Jürgen M. Herrmann, "Range sensing by shearing interferometry: influence of speckle," Appl. Opt. 27, 4631-4637 (1988)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-27-22-4631

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