Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Development of a Piezoelectric Microbalance for Continuous Measurement of Aerosol Mass Concentration.
Author Oli, John G. ; Se, Gilmore J. ; Christenso, Dale L. ;
CORP Author Thermo Systems, Inc., Minneapolis, Minn.
Year Published 1970
Report Number PHS-CPA-22-69-83;
Stock Number PB-193 362
Additional Subjects ( Air pollution ; Monitors) ; ( Piezoelectric gages ; Balances) ; ( Balances ; Design) ; Piezoelectric crystals ; Electrostatic precipitation ; Aerosols ; Particle size ; Sampling ; Reliability(Electronics) ; Particle mass concentration
Library Call Number Additional Info Location Last
NTIS  PB-193 362 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 39p
A piezoelectric aerosol particle mass concentration monitor has been constructed and tested. This instrument detects, with high time resolution, the actual mass concentration of an aerosol cloud. The instrument uses an electrostatic precipitator to deposit aerosol particles directly onto a piezoelectric quartz crystal microbalance. The piezoelectric microbalance system consists of a quartz crystal detector, a reference crystal, two oscillator circuits, a frequency mixing circuit, and readout equipment. The electrostatic precipitator has an advantage over impaction collection devices because it collects the total mass of most aerosols on the crystal surface. It is not subject to a lower particle size cut-off within the range of most natural aerosols. A digital readout automatically indicates actual mass concentration in units of micrograms per cubic meter. Applications of the instrument include automobile particulate emissions monitoring, industrial hygiene measurements, ambient outdoor particulate mass concentration monitoring, industrial process control and source monitoring. The complete instrument is compact, allowing hand-carrying for fast, on-site measurement of particle mass loadings. (Author)