High-speed Digital Color Imaging Pyrometry

Report No. ARL-TR-5571
Authors: John M. Densmore, Matthew M. Biss, Kevin L. McNesby, and Barrie E. Homan
Date/Pages: August 2011; 26 pages
Abstract: Temperature measurements of high-explosive and combustion processes are difficult to obtain due to the speed and environment of the events. To overcome these challenges, we have characterized and calibrated a digital high-speed color camera that may be used to measure the temperature of such events. A two-color ratio method is used to calculate a temperature using the color filter array raw image data and a graybody assumption. If the raw image data is not available, temperatures may be calculated from the processed images or movies, pending proper analysis of the digital color imaging pipeline. We analyze three transformations within the pipeline (demosaicing, white balance, and gamma-correction) to determine their effect on the calculated temperature. Using this technique with a Phantom color camera, we measured the temperature of exploded C-4 charges. The surface temperature of the resulting fireball was found to rapidly increase after detonation and subsequently decayed to a constant value of approximately 1980~K.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2011