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Lidar crossover function and misalignment effects.

K Sassen1, G C Dodd

  • 1University of Utah, Meteorology Department, Salt Lake City, Utah 84112, USA.

Applied Optics
|April 17, 2010
PubMed
Summary
This summary is machine-generated.

The lidar crossover function corrects for incomplete laser and receiver overlap at short ranges. Accurate alignment is crucial for narrow-beam lidar systems, especially for aerosol and precipitation studies.

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Area of Science:

  • Atmospheric Science
  • Optical Remote Sensing

Background:

  • The lidar equation requires a crossover function f(R) to model short-range signal attenuation.
  • This function accounts for the geometric mismatch between laser pulse volume and receiver field of view.
  • Understanding this function is key for accurate near-surface atmospheric measurements.

Purpose of the Study:

  • To develop a simplified formulation for the lidar crossover function f(R).
  • To investigate the impact of realistic lidar geometries and optical misalignment on f(R).
  • To emphasize the importance of precise optical alignment in narrow-beam lidar systems.

Main Methods:

  • Utilized a Gaussian intensity profile for the laser pulse transverse distribution.
  • Derived a simplified mathematical formulation for the crossover function f(R).
  • Performed numerical simulations for various lidar geometries, including optical axes misalignment.

Main Results:

  • Presented a straightforward formulation for the lidar crossover function f(R).
  • Provided numerical results demonstrating f(R) under different geometric conditions.
  • Quantified the influence of optical axes misalignment on the crossover function.

Conclusions:

  • The simplified f(R) formulation is effective for near-surface lidar returns.
  • Accurate optical alignment is critical for narrow-beam lidar systems (approx. 1 mrad).
  • Misalignment significantly impacts lidar performance, particularly for polarization and other sensitive measurements.