Method and apparatus for analysis of particulate content of gases
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
Nov 20, 1996
filing date -
Nov 21, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for analysis of particulate content of gases, applicable to the quantitative and qualitative analysis of vehicle engine emissions, includes sampling, removing particles and analysis of the removed particles. Sampling is effected by electrostatic precipitation using a catalyst-coated piezoelectric crystal. The analysis of the removed particles is effected by heating the crystal in an oxidizing atmosphere to oxidize the deposited particles. Connection of the crystal to an oscillation circuit enables the frequency of oscillation of the crystal to be monitored. Changes in the frequency of oscillation are interpreted to provide quantitative and qualitative analysis of particles deposited and subsequently oxidized.
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