TERMIUM Plus®

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INTEGRATING NEPHELOMETER [1 record]

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Record 1 1989-04-03

English

Subject field(s)
  • Scientific Instruments
  • Environmental Studies and Analyses
  • Air Pollution
CONT

A measure of the cleanliness of air is the atmospheric visibility. That visibility is generally degraded by atmospheric aerosols. The nephelometer is a device which measures the light scattering capability of the atmosphere and thus provides a measure of visibility. The light source in an integrating nephelometer provides excitation for particulates which scatter light into a cone between 10 and 170 degrees of the optic axis. The scattered light is detected with a photomultiplier. The signal is proportional to the scattering coefficient of the aerosol and empirical relations are available to relate this measure to the mass concentration of ambient aerosols.

French

Domaine(s)
  • Instruments scientifiques
  • Études et analyses environnementales
  • Pollution de l'air

Spanish

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