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Reflective all-sky thermal infrared cloud imager

Posted on 2018-04-17 - 20:48
A reflective all-sky imaging system has been built using a long-wave infrared microbolometer camera and a reflective metal dome. This compact system was developed for measuring spatial and temporal patterns of clouds and their optical depth in support of applications including Earth-space optical communications. The camera is mounted to the side of the reflective dome to leave the zenith sky unobstructed. The resulting geometric distortion is removed through an angular map derived from a combination of checkerboard-target imaging, geometric ray tracing, and sun-location- based alignment. A tape of high emissivity material on the side of the dome acts as a reference that is used to estimate and remove thermal emission from the metal dome. Sky radiance measurements from the all-sky imager in the 8-14 m wavelength range agreed to within 0.91 W/(m2 sr) of measurements from a previously calibrated, lens-based infrared cloud imager over its 110 field of view.

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Optics Express

AUTHORS (5)

Brian Redman
Joseph Shaw
Paul Nugent
richard Clark
sabino piazzolla
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