https://www.iala.int/wiki/dictionary/index.php?action=history&feed=atom&title=Scattered-light_meter 2026-04-08T11:33:34Z Revision history for this page on the wiki MediaWiki 1.41.5 https://www.iala.int/wiki/dictionary/index.php?title=Scattered-light_meter&diff=4379&oldid=prev 2009-02-25T00:22:55Z

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<p></p> <p><b>New page</b></p><div><br /> &#039;&#039;&#039;5-4-370<br /> <br /> A device which assesses the visibility by measurement of the luminous or radiant flux scattered out of a direct transmission path from the source of radiation, as a result of the presence of particles in the path.<br /> <br /> <br /> Note: 1 The scattered flux may be measured in a direction at 180 degrees to that of the radiation emitted by the source. The device is then called a back-scatter light meter.<br /> <br /> <br /> Note: 2 The scattered flux is sometimes measured in a direction making a relatively small angle (between 20? and 50?) with that of the radiation emitted from the source.<br /> <br /> <br /> This angle is chosen so that the measured flux is approximately proportional to the total scattered flux; the angle selected depends on the range of visibilities which are of interest. The device is then called a forward-scatter light meter.<br /> <br /> <br /> Note: 3 The scattered flux may be measured over a wide range of scattering angles. In this case the atmospheric sample is within the measuring device. The device is then called a nephelometer.<br /> <br /> {{IALAFooter}}<br /> <br /> {{languages|Scattered-light meter}}<br /> [[Category:5.4 Devices; Miscellaneous Terms]]<br /> [[Category:Alphabetical Index]]<br /> [[Category:IALA Dictionary 1970-89 Edition]]</div>

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