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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 27, Iss. 10 — May. 15, 1988
  • pp: 1934–1938

Differential absorption lidar signal averaging

William B. Grant, Alan M Brothers, and James R. Bogan  »View Author Affiliations


Applied Optics, Vol. 27, Issue 10, pp. 1934-1938 (1988)
http://dx.doi.org/10.1364/AO.27.001934


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Abstract

This paper presents experimental results using an atmospheric backscatter dual CO2 laser differential absorption lidar (DIAL). It is shown that DIAL signals can be averaged to obtain an N−1/2 dependence decrease in the standard deviation of the ratio of backscattered returns from two lasers, where N is the number of DIAL signals averaged, and that such a lidar system can make measurements of gas concentrations with a precision of 0.7% in absorptance over 75 m in a short measurement time when the signal strength is high. Factors that eventually limit the rate of improvement in the SNR, such as changes in the ratio of the absorption and/or backscatter at the two laser frequencies and background noise are discussed. In addition, it is noted that DIAL measurements made using hard-target backscatter often show departures from N−1/2 dependence improvement in the standard deviation, because they are further limited by the combined effects of atmospheric turbulence and speckle, since the relative reproducibility of the speckle pattern on the receiver gives rise to correlations of the lidar signals.

© 1988 Optical Society of America

History
Original Manuscript: January 14, 1987
Manuscript Accepted: January 8, 1988
Published: May 15, 1988

Citation
William B. Grant, Alan M Brothers, and James R. Bogan, "Differential absorption lidar signal averaging," Appl. Opt. 27, 1934-1938 (1988)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-27-10-1934


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References

  1. W. B. Grant, “Laser Remote Sensing Techniques,” in Laser Spectroscopy and Its Applications, L. J. Radziemski, R. W. Solarz, J. A. Paisner, Eds. (Marcel Dekker, New York, 1987), p. 565.
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  26. W. B. Grant, “Effect of Differential Spectral Reflectance on DIAL Measurements Using Topographic Targets,” Appl. Opt. 21, 2390 (1982). [CrossRef] [PubMed]
  27. P. Vujkovic Cvijin, D. Ignjatijevic, I. Mendas, M. Sreckovic, L. Pantani, P. I. Pippi, “Reflectance Spectra of Terrestrial Surface Materials at CO2 Laser Wavelengths: Effects on DIAL and Geological Remote Sensing,” Appl. Opt. 26, 4323 (1987). [CrossRef]

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