Aerosol Extinction Transmissometry at Visible and Infrared Wavelengths Applied to Specialized Problems in CB Defense   [open pdf - 1MB]

"The report compiles, updates, and discusses several novel techniques in aerosol extinction transmissometry, in the visible and infrared wavelength regions, that are applicable to the solution of a variety of specialized problems in CB defense. These techniques share common elements with one another, and so they are brought together here for easy reference. Complex calculations of optical scattering using high-speed electronic computers have become so commonplace that the technology has evolved into several specialty fields, e.g., extinction spectroscopy, angular scattering measurements and nephelometry. As a consequence, the overall technology and our ability to remotely characterize or quantitatively analyze atmospheric aerosols might be further advanced than is realized by workers in the individual disciplines who do not have the time to keep up with advances in other disciplines. This report examines techniques of transmission (extinction) and turbidity spectroscopy, polarization and angular scattering measurements, and related developments and concludes that computer programs can be written to optimize desired parameters in interdisciplinary investigations. An appendix discusses sampling, which is a complicated problem in aerosol physics. A technique described to monitor continuously the mass concentration of monodisperse test aerosols using a He:Ne laser."

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Defense Technical Information Center (DTIC): http://www.dtic.mil/dtic/
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