Measuring and testing – Gas analysis – By vibration
Patent
1996-11-20
1999-04-06
Noland, Thomas P.
Measuring and testing
Gas analysis
By vibration
73 2804, G01N 2902
Patent
active
058921419
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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Patent Abstracts of Europe GB 02270564A Mar. 16 1994 "Analyte Identification Using Oscillating Sensors".
Jones Barbara L.
Peter Kenneth W.
Noland Thomas P.
Sun Electric U.K. Limited
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