Visibility Meter

From ExoDictionary
Jump to: navigation, search
This definition article has been automatically generated.
You can help ExoDictionary by expanding, updating, or correcting it.


This autostub has not yet had its initial copyediting proof and may contain significant formatting and even factual errors. You can improve Exodictionary by cleaning up the page markup and verifying that the definition is correct and then removing this tag.


This autostub has not yet had its initial categorization proof and may be categorized incorrectly. You can improve Exodictionary by removing inappropriate categories and then removing this tag.


Visibility Meter

</dt>
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> ]]

References

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