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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 23 — Aug. 10, 2007
  • pp: 5979–5986

Pupil plane imager for estimation of turbulence over long horizontal paths

Richard B. Holmes and Williams M. Hughes  »View Author Affiliations

Applied Optics, Vol. 46, Issue 23, pp. 5979-5986 (2007)

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A pupil plane imaging system, consisting of a camera and optics that image the entrance pupil of a telescope, measures scintillation induced by atmospheric turbulence. Algorithms are developed to estimate the distribution of turbulence from scintillation assuming the well known relationship between scintillation scale size and the range of turbulence layer. The algorithms were exercised using a 75   cm pupil within a 1 meter telescope located at North Oscura Peak in New Mexico, based on light from a source 52 .6   km away. Estimates of the C n 2 profile over the path are derived using coarse range bins. From the C n 2 profile, an estimate of Fried's transverse coherence length was computed and compared with that from other sensors. The algorithm is tested in several ways. Error sources are discussed, including the intrinsic insensitivity of the technique to turbulence near the pupil.

© 2007 Optical Society of America

OCIS Codes
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(010.3310) Atmospheric and oceanic optics : Laser beam transmission
(100.2000) Image processing : Digital image processing
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(280.7060) Remote sensing and sensors : Turbulence
(290.5930) Scattering : Scintillation

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: April 25, 2007
Manuscript Accepted: June 22, 2007
Published: August 9, 2007

Richard B. Holmes and Williams M. Hughes, "Pupil plane imager for estimation of turbulence over long horizontal paths," Appl. Opt. 46, 5979-5986 (2007)

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