Effect of spectral time lag correlation coefficient and signal averaging on airborne CO2 DIAL measurements

Avishai Ben-David; Richard G. Vanderbeek; Steven W. Gotoff; Francis M. D'Amico

doi:10.1117/12.279071

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31 October 1997 Effect of spectral time-lag correlation coefficient and signal averaging on airborne CO₂ DIAL measurements

Avishai Ben-David, Richard G. Vanderbeek, Steven W. Gotoff, Francis M. D'Amico

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Proceedings Volume 3127, Application of Lidar to Current Atmospheric Topics II; (1997) https://doi.org/10.1117/12.279071
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The effects of flight geometry, signal averaging and time- lag correlation coefficient on airborne CO₂ dial lidar measurements are shown in simulations and field measurements. These factors have implications for multi- vapor measurements and also for measuring a shingle vapor with a wide absorption spectra for which one would like to make DIAL measurements at many wavelengths across the absorption spectra of the gas. Thus it is of interest to know how many wavelengths and how many groups of wavelengths can be used effectively in DIAL measurements. Our data indicate that for our lidar about 80 wavelengths can be used for DIAL measurements of a stationary vapor. The lidar signal is composed of fluctuations with three time scales: a very short time scale due to system noise which is faster than the data acquisition sampling rate of the receiver, a medium time scale due to atmospheric turbulence, and a long time scale due to slow atmospheric transmission drift from aerosol in homogeneities. The decorrelation time scale of fluctuations for airborne lidar measurements depends on the flight geometry.

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Avishai Ben-David, Richard G. Vanderbeek, Steven W. Gotoff, and Francis M. D'Amico "Effect of spectral time-lag correlation coefficient and signal averaging on airborne CO₂ DIAL measurements", Proc. SPIE 3127, Application of Lidar to Current Atmospheric Topics II, (31 October 1997); https://doi.org/10.1117/12.279071

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