26 May 2006 Two-band infrared thermographer for standoff temperature measurements
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OPTRA presents a new approach to remote infrared temperature measurements over mid to long standoff ranges in varying atmospheric conditions. The sensor is intended as a feedback mechanism for use with the Active Denial System to insure the target's skin temperature is within a safe range. OPTRA's sensor employs a small reflector telescope followed by a series of interference filters which form spatially identical but spectrally separated images on two miniature uncooled microbolometer focal plane arrays. On a pixel by pixel basis, we algebraically combine and normalize the two images. By carefully selecting the spectral passbands of the two images, the mathematical process yields a result that is substantially free of errors caused by humidity, rain, light fog, and atmospheric carbon dioxide. The package measures six x six x 18-inches and weighs six lbs. The package includes an on-axis miniature visible imager, and the graphical user interface presents a fused visible/infrared image with user-defined transparency levels. The visible/infrared combination provides good spatial resolution at large distances and ease of pointing along with the accurate temperature measurement across the field of view.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Julia R. Dupuis, Julia R. Dupuis, David Mansur, David Mansur, Robert Vaillancourt, Robert Vaillancourt, David Carlson, David Carlson, Elizabeth Schundler, Elizabeth Schundler, George Genetti, George Genetti, } "Two-band infrared thermographer for standoff temperature measurements", Proc. SPIE 6219, Enabling Technologies and Design of Nonlethal Weapons, 62190E (26 May 2006); doi: 10.1117/12.666030; https://doi.org/10.1117/12.666030

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