Comparison of analysis techniques for multiwavelength DIAL

Ernst Ted Scharlemann

doi:10.1117/12.283913

31 October 1997 Comparison of analysis techniques for multiwavelength DIAL

Ernst Ted Scharlemann

Proceedings Volume 3127, Application of Lidar to Current Atmospheric Topics II; (1997) https://doi.org/10.1117/12.283913
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Differential absorption LIDAR (DIAL) with multiple wavelengths provides capabilities for separately identifying and quantifying chemicals in mixtures that are impossible for conventional two-line DIAL. It also permits several choices about how to convert individual laser pulse returns into estimates of gas concentrations. These choices concern both averaging techniques and procedures for fitting averaged data to library spectra of possible gases. The purpose of this paper is to compare several analysis options using real data taken with 8 or 10 mid-wave IR wavelengths in field test. The options fall naturally into two groups, as implied above. The first group comprises ways to combine data averaging with ratioing. The second group comprises various maximum-likelihood estimators and least-squares fits of the averaged data. Several options arise in the second group because data is taken at multiple wavelengths; for two-line DIAL there would be only a single option in this second group. This paper compares the result of field data analysis for these two groups of options. The properties of the data acquired by the multi-line DIAL system are first described. Then the three averaging/ratioing techniques are discussed. The various options for extracting concentration estimates from averaged data are compared. Finally, the implications for remote sensing data analysis are discussed.

Citation Download Citation

Ernst Ted Scharlemann "Comparison of analysis techniques for multiwavelength DIAL", Proc. SPIE 3127, Application of Lidar to Current Atmospheric Topics II, (31 October 1997); https://doi.org/10.1117/12.283913

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