Tyndalloscope

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A tyndalloscope or tyndallometer is a photometric measuring device for determining dust concentrations. It is based on the light scattering on airborne particles ( Tyndall effect ). The measurement result is output as dust mass per volume unit.

background

The measuring principle of the tyndalloscope is based on the fact that the particles contained in an aerosol diffract an incident light beam. The intensity of the scattering is related to the number of particles and their surface. To measure the dust concentration, a measuring volume filled with the gas to be examined is illuminated by a parallel light beam. The intensity of the light beam scattered at a certain angle compared to the intensity of the light source is a measure of the dust concentration in the gas being examined. The evaluation can take place at the measuring location. Particle size distributions cannot be determined with the Tyndalloscope.

In 1871, quantified John Tyndall , the London air pollution by scattering of light on suspended particles. The tyndalloscope as a measuring device was established in the mid-1930s.

See also

literature

  • OM Faber: "Gravimetric", "tyndallometric" or "conimetric" measuring experience. In: dust . Issue 7, 1937, pp. 372-408.

Individual evidence

  1. ↑ a b Carsten Möhlmann: Dust measurement technology - then until now. In: Hazardous substances - cleanliness. Air . 65, No. 5, 2005, ISSN  0949-8036 , pp. 191-194.
  2. ↑ a b D. Hasenclever: Investigations into the suitability of various dust measuring devices for the operational measurement of mineral dusts. In: dust . No. 41, 1955, pp. 388-435.
  3. ^ Gustav Kühnen, Wolfgang Pfeiffer, Edgar Rudolf: Development of the dust measurement technology at the workplace. In: Dust - cleanliness. Air . 46, No. 4, 1986, ISSN  0949-8036 , pp. 177-181.