Visibility Meter

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Visibility Meter

The general term for instruments used to make direct measurements of visual range in the atmosphere or of the physical characteristics of the atmosphere which determine the visual range. </dd>
Visibility meters may be classified according to the quantities that they measure. Telephotometers and transmissometers measure the transmissivity or alternatively, the extinction coefficient of the atmosphere. Nephelometers measure the scattering function of the atmospheric suspensoids. A third category of visibility meters makes use of an artificial haze of variable density which is used to obscure a marker at a fixed distance from the meter. [[/a>|/a> ]]


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use