2 May 2018 Visibility in degraded visual environments (DVE)
Author Affiliations +
Abstract
As visibility decreases, crew workload increases resulting in reduced operational capability. As a consequence it is useful to define standard operational levels defining operational constraints based on visibility range. For given atmospheric conditions, visibility varies with wavelength meaning that the operational level may vary depending on the sensor waveband. Results from a number of previous authors are combined to present an updated and integrated set of spectral attenuation and visibility curves from the visible through the millimeter wave regime. These curves show attenuation through standard and humid atmospheres and the effects of various levels of rain and fog. Obscurant particle size ranges are shown to help explain the observed phenomenology. In addition, work from a number of other authors is combined to relate standard meteorological measurements (densities or rates) to visibility. These results are compared with the spectral attenuation curves. The result is an ability to relate obscurant density or rate to attenuation or visibility and hence operational level at any wavelength from visible through the millimeter wave regime.
Conference Presentation
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John N. Sanders-Reed, John N. Sanders-Reed, Stephen J. Fenley, Stephen J. Fenley, } "Visibility in degraded visual environments (DVE)", Proc. SPIE 10642, Degraded Environments: Sensing, Processing, and Display 2018, 106420S (2 May 2018); doi: 10.1117/12.2305008; https://doi.org/10.1117/12.2305008
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