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Applied Optics

Applied Optics


  • Vol. 41, Iss. 30 — Oct. 20, 2002
  • pp: 6332–6340

Design and performance considerations of cat’s-eye retroreflectors for use in open-path Fourier-transform-infrared spectrometry

Robert L. Richardson and Peter R. Griffiths  »View Author Affiliations

Applied Optics, Vol. 41, Issue 30, pp. 6332-6340 (2002)

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A ray-tracing analysis of cat’s-eye retroreflectors for use in active open-path Fourier-transform-infrared (OP/FT-IR) spectrometry and the results of testing f/0.5 and f/1.75 cat’s-eye retroreflectors built in our laboratory with a commercial active OP/FT-IR spectrometer are presented. The ray-tracing model is based on the optical characteristics of a commercial single-telescope monostatic OP/FT-IR spectrometer and explores trends in cat’s-eye behavior in practical but rigorous field conditions encountered during transportable outdoor use. All mirrors modeled are paraboloids for which the focal ratios of the primary mirror are f/0.5, f/1.75, and f/3. The effect of the focal ratio of the primary mirror, the focal length of the secondary mirror, and the off-axis alignment of the primary and the secondary mirror have been evaluated as a function of path length, including variable input-beam divergence, between the spectrometer and the cat’s-eye. The paraboloidal mirrors comprising the primary and secondary of the cat’s-eye retroreflectors tested were made in our laboratory by spin casting liquid epoxy-graphite composite mixtures followed by in situ polymerization with no postpolishing.

© 2002 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(220.2740) Optical design and fabrication : Geometric optical design
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: May 21, 2001
Revised Manuscript: May 14, 2002
Published: October 20, 2002

Robert L. Richardson and Peter R. Griffiths, "Design and performance considerations of cat’s-eye retroreflectors for use in open-path Fourier-transform-infrared spectrometry," Appl. Opt. 41, 6332-6340 (2002)

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