29 May 2014 Three dimensional temperature estimation of a fire plume using multiple longwave infrared camera views
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Abstract
In order to determine true radiometric quantities in intense fires a three dimensional (3D) understanding of the fire radiometric properties is desirable, e.g., for estimating peak fire temperatures. Imaging pyrometry with a single infrared camera view can provide only two dimensional path-averaged radiometric information. Multiple camera views, however, can form the basis for determining 3D radiometric information such as radiance, emissivity, and temperature. Analytically the fire can be divided into sub-volumes in which radiometric properties are assumed roughly constant. Using geometric and thermal equilibrium relationships between the fire sub-volumes, together with LWIR camera imagery acquired at multiple carefully defined camera views, radiometric properties of each sub-volume can be estimated. In this work, initial proof-of-principle results were obtained by applying this analysis to sets of LWIR camera imagery acquired during intense (2500 – 3000 K) fires. We present 3D radiance and temperature maps of the fires obtained using this novel approach.
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Michele B. Lohr, Michael E. Thomas, Todd M. Neighoff, Daniel T. Prendergast, Austin G. Dress, Sean T. Happel, Karen M. Siegrist, Yale Chang, "Three dimensional temperature estimation of a fire plume using multiple longwave infrared camera views", Proc. SPIE 9071, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXV, 90711C (29 May 2014); doi: 10.1117/12.2050828; https://doi.org/10.1117/12.2050828
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