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26 May 2006Two-band infrared thermographer for standoff temperature measurements
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.
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Julia R. Dupuis, David Mansur, Robert Vaillancourt, David Carlson, Elizabeth Schundler, George Genetti, "Two-band infrared thermographer for standoff temperature measurements," Proc. SPIE 6219, Enabling Technologies and Design of Nonlethal Weapons, 62190E (26 May 2006); https://doi.org/10.1117/12.666030