Real time infrared aerosol analyzer

Details Real time infrared aerosol analyzer Real time infrared aerosol analyzer

1988-11-18

1990-07-17

Howell, Janice A.

Radiant energy

Methods including separation or nonradiant treatment of test...

356 38, G01N 2101

Patent

active

049422979

ABSTRACT:
Apparatus for analyzing aerosols in essentially real time includes a virtual impactor which separates coarse particles from fine and ultrafine particles in an aerosol sample. The coarse and ultrafine particles are captured in PTFE filters, and the fine particles impact onto an internal light reflection element. The composition and quantity of the particles on the PTFE filter and on the internal reflection element are measured by alternately passing infrared light through the filter and the internal light reflection element, and analyzing the light through infrared spectrophotometry to identify the particles in the sample.

REFERENCES:
patent: 4570494 (1986-02-01), Dunn et al.
Johnson et al., Chemical Charact. of Atmosph. Aerosol using ATR IR Spectroscopy, AICHE Symposium Series, (1981).

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