Backscatter measurements of aerosolized CB simulants with a frequency agile CO2 lidar

Richard Vanderbeek; Kristan Gurton

doi:10.1117/12.519106

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27 February 2004 Backscatter measurements of aerosolized CB simulants with a frequency agile CO₂ lidar

Richard Vanderbeek, Kristan Gurton

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Proceedings Volume 5268, Chemical and Biological Standoff Detection; (2004) https://doi.org/10.1117/12.519106
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States

Abstract

A novel windowless chamber was developed to allow aerosol backscatter measurements with a frequency-agile CO₂ lidar. The chamber utilizes curtains of air to contain the cloud, thus preventing the inevitable backscatter off of conventional windows from corrupting the desired measurements. This feature is critical because the CO₂ lidar has a long (1 μs) pulse and the backscatter off the window cannot be temporally separated from the backscatter off the aerosol in the chamber. The chamber was designed for testing with a variety of CB simulants and interferents in both vapor and aerosol form and has been successfully shown to contain a cloud of known size, concentration, and particle size distribution for 10-15 minutes. This paper shows the results using Arizona road dust that was screened by the manufacturer into 0-3 μm and 5-10 μm particle size distributions. The measurements clearly show the effect of size distribution on the infrared backscatter coefficients as well as the dynamic nature of the size distribution for a population of aerosols. The test methodology and experimental results are presented.

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Richard Vanderbeek and Kristan Gurton "Backscatter measurements of aerosolized CB simulants with a frequency agile CO₂ lidar", Proc. SPIE 5268, Chemical and Biological Standoff Detection, (27 February 2004); https://doi.org/10.1117/12.519106

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