Aethalometer

Details Aethalometer Aethalometer

1988-01-25

1990-01-16

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

By comparison

356 38, G01N 2101, G01N 2159

Patent

active

048939340

ABSTRACT:
An improved aethalometer (10) having a single light source (18) and a single light detector (20) and two light paths (21, 22) from the light source (18) to the light detector (20). A quartz fiber filter (13) is inserted in the device, the filter (13) having a collection area (23) in one light path (21) and a reference area (24) in the other light path (22). A gas flow path (46) through the aethalometer housing (11) allows ambient air to flow through the collection area (23) of the filter (13) so that aerosol particles can be collected on the filter. A rotating disk (31) with an opening (33) therethrough allows light for the light source (18) to pass alternately through the two light paths (21, 22). The voltage output of the detector (20) is applied to a VCO (52) and the VCO pulses for light transmission separately through the two light paths (21, 22 ) are counted and compared to determine the absorption coefficient of the collected aerosol particles.

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Rosen et al, "An Instrument for the Quasi-Real Time Measurement of the Optical Absorption Coefficient of Ambient Aerosols", Lawrence Berkeley Laboratory (LBID--256), Aug. 1980.
Hansen et al, "Real-Time Measurement of the Absorption Coefficient of Aerosol Particles", Applied Optics, vol. 21, No. 17, (1 Sep. 1982), pp. 3060-3062.
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Hansen et al., "The Aethalometer", The Science of the Total Environment, vol. 36, (1984), pp. 191-196.

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