出典:Wiktionary
出典:『Wiktionary』 (2015/04/02 05:49 UTC 版)
From Ancient Greek νεφέλη (nephélē, “cloud”) + -meter.
nephelometer (複数形 nephelometers)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/23 09:57 UTC 版)
A nephelometer is a stationary or portable instrument for measuring suspended particulates in a liquid or gas colloid. A nephelometer measures suspended particulates by employing a light beam (source beam) and a light detector set to one side (often 90°) of the source beam. Particle density is then a function of the light reflected into the detector from the particles. To some extent, how much light reflects for a given density of particles is dependent upon properties of the particles such as their shape, color, and reflectivity. Nephelometers are calibrated to a known particulate, commonly Arizona road dust then use environmental factors k-factors to compensate lighter or darker colored dusts accordingly. K-factor is determined by the user by running the nephelometer next to an air sampling pump and comparing results.