G - Physics – 01 – N
Patent
G - Physics
01
N
73/59
G01N 21/84 (2006.01) G01N 27/66 (2006.01)
Patent
CA 1250153
ABSTRACT OF THE DISCLOSURE Aerosol particles, resulting from the combustion of organic substances with insufficient oxygen supply, usually contain toxic, higher hydrocarbonic substances (e.g. tar) on their sur- face. These substances, e.g. tar, has the property to be photo- electrically more active than other substances contained in the athmosphere. In the apparatus according to the invention the aerosol to be characterized is fed through a chamber and sub- jected to ultraviolet radiation. A controllable fan provides a desired flow velocity of the aerosol, contained in a carrier gas, through the chamber. Thereafter the charge of the photo- electrically positively charged particles is determined by means of size-selective filter means which are connected to current or charge measuring equipment. The measured values are proportional to the amount of tar present on the surface of the particles contained in the aerosol. The apparatus is particu- larly useful for the measurement of air pollution.
481195
Burtscher Heinz
Schmidt-Ott Andreas
Siegmann Hans-Christoph
Matter Siegmann Ag
Ridout & Maybee Llp
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