Mr. Robert C. Slaughter Profile

Robert C. Slaughter

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SPIE Journal Paper | 20 January 2015 Open Access

Two-dimensional temperature analysis of nuclear fireballs using digitized film

Robert Slaughter, Tyler Peery, John McClory

JARS, Vol. 9, Issue 01, 095096, (January 2015) https://doi.org/10.1117/12.10.1117/1.JRS.9.095096

KEYWORDS: Cameras, Heat flux, Digital imaging, Data modeling, Remote sensing, Electro optical modeling, Nuclear weapons, Calibration, Atmospheric modeling, Absorbance

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Researchers at Lawrence Livermore National Laboratory have begun digitizing technical films spanning the atmospheric nuclear testing operations conducted by the United States from 1945 through 1962. Each atmospheric nuclear test was filmed by Edgerton, Germeshausen, and Grier, Inc., using between 20 to 40 cameras per test. These technical film test data represent a primary source for advancing the knowledge of nuclear weapon output as well as the understanding of nonnuclear high-temperature gases. This manuscript outlines the procedures followed in order to perform two-dimensional temperature calculations for early time nuclear fireballs using digitized film. The digitized optical densities of the film were converted into irradiance on the film that was then used to determine an effective power temperature. The events Wasp Prime and Tesla of Operation Teapot were analyzed using this technique. Film temperature results agreed within uncertainties with historic data collected by calorimeters. Results were also validated by comparison to a thermal heat flux solution that utilizes historic thermal yield values to normalize radiant flux. Additionally, digital imaging and remote sensing image generation was used to demonstrate that the two-dimensional temperature calculation was self-consistent.

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