Accession Number:

ADA621703

Title:

High-speed Digital Color Imaging Pyrometry

Descriptive Note:

Final rept.

Corporate Author:

ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE

Report Date:

2011-08-01

Pagination or Media Count:

26.0

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 1980K.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Photography
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE