A model for an omnidirectional radiometer

M. E. Jansen; L. R. Gauthier Jr.; N. W. Rolander

doi:10.1117/12.818650

27 April 2009 A model for an omnidirectional radiometer

M. E. Jansen, L. R. Gauthier Jr., N. W. Rolander

Proceedings Volume 7316, Fiber Optic Sensors and Applications VI; 73160Q (2009) https://doi.org/10.1117/12.818650
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

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.

Citation Download Citation

M. E. Jansen, L. R. Gauthier Jr., and N. W. Rolander "A model for an omnidirectional radiometer", Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 73160Q (27 April 2009); https://doi.org/10.1117/12.818650

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