The Quartz Crystal Microbalance was calibrated and its response to particle size and mass concentration was determined

Matthews, N.

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https://ntrs.nasa.gov/search.jsp?R=19790021322 2020-03-21T22:39:10+00:00Z
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STATUS REPORT
FOR
THE CALIBRATION OF THE QUARTZ CRYSTAL MICROBALANCE
CASCADE IMPACTOR USING THE BERGLUND--LIU MONODISPERSE
AEROSOL GENERATOR FOR AEROSOL STUDIES
IN THE ATMOOPHERE: NSG 1593
TO
MR, DAVID C. WOODS
NASA TECHNICAL OFFICER
AND
NASA SCIENTIFIC AND TECHNICAL INFORMATION FACILITY
FROM
NATHANIEL MATTHEWS
LeMOYNE-OWEN COLLEGE
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The Calibration of the Quartz Crystal Microbalance
Cascade Impactor using the Berglund-Liu Monodisperse
Aerosol Generator for Aerosol Studies in the Atmosphere
Objective
The objective of this grant is to calibrate the Quartz
Crystal Microbalance (QCM) and determine its response to
particule size and mass concentration.
Instrument Description
The QCM is the most promising of the instruments
capable of giving real time data of aerosols' characteristics
from stratospheric and surface sampling. It is a ten stage
cascade impactor that collects pollutants aerodynamically
according to their size distribution and density. l The QCM
is flown on tM NASA-U-2, Saberliner, and the P-3 for sampling
stratospheric ,ie rosols, 2
 ambient tropospheric aerosols,
exhaust plumes from rocket motors, 3 exhaust plumes from active
volcanoes, 4
 and exhaust plumes from coal fired burners from
industrial plants when mounted on a Van.5
Since 'ioth the sizing characteristics and the mass
sensivity values are based on design parameters of the QCM,
the calibration will endeavor to produce laboratory values to
compare with these calculated values.
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The experimental procedure was begun using monodisperse
latex spherical .articles of known size and density. The
Royco 256 particle generator which employs the nebulize
method was used to generate the particles. The monodisper-
sity of the generated particles was checked with an optical
particle counter (Particle Data System FSSP-100) to assure
that no doublets were present. Particles of the foil,wing
sizes 0.312, 0.500, 0.714, 1.011 and 2.020 micrometers
were generated using the above method.
The results of these measurements show the maximum
'	 response (Change in Frequency) occuring in the stage of
the QCM which has a 50% efficiency nearest to the size
of the particle used. There is, therefore, agreement
between the calculated and measured response to particle
size over the size range considered.
The Berglund-Liu Aerosol GenErator 6 will be used to
generate particles of large size (up to 25 micrometers)
and using materials of a variety of mass density. Which
may have different aerodynamic behaviors. This technique
not only will enable me to extend the particle size calibra-
tion up to the rraximum limit of the QCM, it is also a useful
technique for calibrating mass concentration.
3b
REFERENCE
1Chuan, R.L.,"Rapid Measurement of Particulate Size
distribution in the Atmospher", AIAA J, Vol. 10, No. 12,
Dec. 1972, pp. 1701-1704.
2	 , 1965, Strat.opheric Particles
at 20km Altitude: Geochim. Cosmcchim. Acta, V 29, p. 201-
207.
3Chuan, R. and Woods, D.C., "Morphology and Elementai
Composition Analysis by Size of Rocket Particulate
Effluent," Proceedings of the 4th Joint Conference on
Sensing of Environmental Pollutants.
4 Davies, D.K., etc, "Airfall from the 1974 eruption of
Volcano de Fuc go, Guatemala: Gcol. Scol. Amer. Bull.,
V. 89 (in press).
5Woods, David, G. Storey, R. W., Jr., Sentell, Smith,
Harris, "Atmospheric Particulate Measurements in Norfork,VA,"
NASA TMX 3285.
6Berglund, R.N.,"Basic Aerosol Standards and Optical
Measurements of Aerosol Particles," University Microfilms,
1972.
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The calibration of the quartz crystal microbalance cascade impactor using the berglund-liu monodisperse aerosol generator for aerosol studies in the atmosphere

The calibration of the quartz crystal microbalance cascade impactor using the berglund-liu monodisperse aerosol generator for aerosol studies in the atmosphere

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