17 November 2005 Two-band infrared thermographer for standoff temperature measurements
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Abstract
We present a new approach to remote infrared temperature measurements over mid to long standoff ranges in varying atmospheric conditions. The sensor is intended for remote triage applications where direct access to victims may be hazardous or otherwise impossible. Our system 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 6 x 6 x 18-inches and weighs 6 lbs. We have also added an on-axis miniature visible imager to the system and present the user with 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 H. Rentz, Julia H. Rentz, 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 6010, Infrared to Terahertz Technologies for Health and the Environment, 60100F (17 November 2005); doi: 10.1117/12.629894; https://doi.org/10.1117/12.629894
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