27 April 2009 A model for an omnidirectional radiometer
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Most radiometers are directionally sensitive. Measuring optical radiation in a given environment is typically done using a collection aperture pointing in the direction of the optical source. The collection aperture has a limited field of view, and the collection efficiency decreases as the angle from direct line of sight increases. Thus, radiometers typically have a limited solid angle for viewing sources. This paper describes a model of an omnidirectional, multi-channel, rotating radiometer that provides a framework for acquiring spatially comprehensive radiometric data from an environment. By exploiting the spatial diversity of multiple collection apertures in multiple directions, sources from all directions are measured via three-dimensional scanning. As the radiometer rotates, data are collected that denote the radiant flux seen by each collection aperture as a function of time. These waveforms are used to determine the directions and magnitudes of electromagnetic sources in the environment without requiring a priori knowledge about the directions of specific sources.
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M. E. Jansen, M. E. Jansen, L. R. Gauthier, L. R. Gauthier, N. W. Rolander, N. W. Rolander, } "A model for an omnidirectional radiometer", Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 73160Q (27 April 2009); doi: 10.1117/12.818650; https://doi.org/10.1117/12.818650

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