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Atmospheric-pressure Molecular Imaging of Biological Tissues and Biofilms by LAESI Mass Spectrometry

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Double-ended lidar technique for aerosol studies.

H G Hughes, M R Paulson

|June 10, 2010

Summary

This study introduces a double-ended lidar technique to accurately measure atmospheric extinction coefficients without needing assumptions about backscatter. This method improves single-ended lidar inversion accuracy by providing precise boundary values.

Area of Science:

Atmospheric optics and remote sensing
Lidar technology and applications

Background:

Single-ended lidar inversion relies on assumptions linking backscatter and extinction coefficients.
These assumptions limit the accuracy of derived range-dependent atmospheric extinction coefficients.

Purpose of the Study:

To eliminate the need for backscatter-extinction ratio assumptions in lidar atmospheric measurements.
To develop and validate a double-ended lidar technique for accurate extinction coefficient retrieval.
To provide precise boundary values for single-ended lidar inversion algorithms.

Main Methods:

Utilized two lidars operated reciprocally over a ~1 km slant path.
Compared lidar returns from a common volume to eliminate reliance on backscatter-extinction relationships.

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Measured extinction and backscatter coefficients under reduced visibility conditions.

Main Results:

Successfully retrieved range-dependent atmospheric extinction and backscatter coefficients.
Determined the extinction coefficient as a function of position between the lidars.
Provided accurate boundary values for both forward and reverse single-ended lidar inversion algorithms.

Conclusions:

The double-ended lidar approach accurately determines atmospheric extinction coefficients without prior assumptions.
This method enhances the accuracy of single-ended lidar inversion by supplying reliable input parameters.
Evaluated the impact of constant versus position-varying backscatter-to-extinction ratios on inversion accuracy.