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Horizontal scintillation detection and ranging Cn2(z) estimation.

Rachel A Johnston1, Nicholas J Wooder, Frederick C Reavell

  • 1Blackett Laboratory, Imperial College, London SW7 2BZ, UK. johnston_ra@hotmail.com

Applied Optics
|July 2, 2003
PubMed
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Optical turbulence strength (Cn2) was measured along a 1.23-km horizontal path using infrared lasers. A modified SCIDAR inversion method was developed and tested for this non-standard atmospheric measurement.

Area of Science:

  • Atmospheric optics
  • Optical turbulence measurement
  • Remote sensing

Background:

  • Optical turbulence affects signal propagation.
  • Standard SCIDAR is for vertical atmospheric profiling.
  • Horizontal path measurements present unique challenges.

Purpose of the Study:

  • Measure optical turbulence strength (Cn2) horizontally.
  • Adapt SCIDAR for non-astronomical, ground-level paths.
  • Validate a new inversion method with field data.

Main Methods:

  • Simultaneous scintillation capture from two infrared laser sources.
  • Deployment over a 1.23-km horizontal path at 2-3m altitude.
  • Development and application of a horizontal path SCIDAR inversion technique.

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Main Results:

  • Successful measurement of Cn2 along the horizontal path.
  • Demonstration of the SCIDAR inversion method's applicability.
  • Data collected differ significantly from typical vertical SCIDAR.

Conclusions:

  • The adapted SCIDAR method is effective for horizontal optical turbulence profiling.
  • This technique provides valuable data for ground-level atmospheric studies.
  • Further validation across diverse conditions is warranted.