Aethalometer Exterior
An aethalometer is an instrument for measuring the concentration of optically absorbing (‘black’) Suspension (chemistry), suspended particulates in a gas colloid stream; commonly visualized as smoke or haze, often seen in ambient air under polluted conditions. The word aethalometer is derived from the Classical Greek verb ''aethaloun'', meaning "to blacken with soot". The aethalometer, a device used for measuring black carbon in atmospheric aerosols, was initially deployed in 1980 and was first commercialized by Magee Scientific. Principle of operation The gas stream (frequently ambient air) passes through a Filter paper, filter material which traps the suspended particulates, creating a deposit of increasing density. A light beam projected through the deposit is Attenuation, attenuated by those particles which are Light absorption, absorbing (‘black’) rather than Light scattering, scattering (‘white’). Measurements are made at successive regular time intervals. The i ...
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