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Differential absorption lidar signal averaging.

W B Grant, A M Brothers, J R Bogan

|June 10, 2010

Summary

This summary is machine-generated.

Averaging differential absorption lidar (DIAL) signals improves measurement precision for gas concentrations. This atmospheric lidar system achieved 0.7% absorptance precision over 75m, demonstrating effective atmospheric sensing capabilities.

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Area of Science:

Atmospheric remote sensing
Laser spectroscopy
Environmental monitoring

Background:

Differential Absorption Lidar (DIAL) is a key technology for atmospheric gas concentration measurements.
Understanding signal averaging effects is crucial for improving DIAL system accuracy and precision.
Factors limiting signal-to-noise ratio (SNR) in DIAL systems require careful consideration for reliable data.

Purpose of the Study:

To experimentally investigate the signal averaging properties of a dual CO(2) laser DIAL system.
To quantify the achievable precision in gas concentration measurements using this DIAL system.
To identify and discuss factors limiting the performance and precision of atmospheric DIAL measurements.

Main Methods:

Utilized an atmospheric backscatter dual CO(2) laser differential absorption lidar (DIAL) system.
Performed experimental measurements to assess the impact of signal averaging on measurement precision.
Analyzed the standard deviation of backscattered returns as a function of the number of averaged DIAL signals (N).

Main Results:

Demonstrated an N^(-1/2) dependence decrease in the standard deviation of the ratio of backscattered returns with signal averaging.
Achieved high precision measurements of gas concentrations, with 0.7% absorptance accuracy over 75m under high signal strength conditions.
Identified atmospheric turbulence and speckle effects as limiting factors for hard-target DIAL measurements, causing deviations from ideal averaging behavior.

Conclusions:

Signal averaging is an effective method to enhance the precision of dual CO(2) laser DIAL systems for atmospheric sensing.
The developed DIAL system shows potential for accurate and precise measurements of gas concentrations in atmospheric studies.
Further research is needed to mitigate the impact of atmospheric turbulence and speckle on DIAL measurement accuracy, especially for hard-target scenarios.