PILOT-81 VVA EXPERIMENT-Analysis of the Multi-Path Transmissonmeter-Radiometer Measurements

Report No. ARL-TR-2953
Authors: R.A. Sutherland and J.E. Butterfield
Date/Pages: April 2003; 60 pages
Abstract: This report presents results and findings from the PILOT81 Emissive Sources Verification Experiments carried out at the Survivability/Lethality Analysis Directorate (SLAD), U.S. Army Research Laboratory Tower site at the White Sands Missile Range during February 1999. The experiments involved (near) simultaneous measurements of direct transmittance and normalized path emission/radiance sampled over three slightly diverging lines of sight through intervening obscurants comprised of either graphite flakes or brass powers of varying concentration levels. Specifically this report presents measurements of direct transmission and total radiance obtained over four spectral bands from the visible through far infrared using the SLAD Multiple Path Transmissometer-Radiometer (MPTR) system augmented with a conventional dual band infrared scanning imager. From the combined transmissometer and radiometer results we are able to determine both the multi-band transmittance and normalized path radiance, or ?sky-to-ground? ratio, for cloud optical depths ranging from τ=0 to about τ= 8.
Distribution: Approved for public release
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Last Update / Reviewed: April 1, 2003