Measuring and testing – Vibration – By mechanical waves
Patent
1985-08-13
1987-01-06
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73643, 738655, 356336, G01N 2900
Patent
active
046337148
ABSTRACT:
An instrument for analyzing the size and charge of aerosol particles employs a dual beam laser Doppler velocimeter to track the motion of a particle while subjecting the particle to a sinusoidal acoustic field and to a pulsed, high voltage electric field. The particle transmitting through the crossed beams of the laser Doppler velocimeter moves with an oscillatory motion due to the acoustic field and, if the particle is charged, it has a horizontal drift parallel to the electric field during the electric pulse. The phase lag of the particle's motion with respect to the acoustic field is measured to determine the aerodynamic diameter of the particle and the velocity and the direction of the drift relative to the polarity of the applied high voltage electric field is used to determine the magnitude and polarity of the electric charge of the particle.
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M. Mazumder, R. Ware, and W. Hood, "Simultaneous Measurements of Aerodynamic Diameter and Electrostatic Charge on a Single-Particle Basis", Chapter 11 of Measurement of Suspended Particles by Quasi-Elastic Light Scattering, 327-341 (edited by B. Dahneke), Wiley-Interscience, New York (1983).
M. Mazumder et al., "Real-Time Measurements and Control of Particle Charge as Applied to Electrostatically Enhanced Fabric Filters", University of Arkansas Graduate Institute of Technology Technical Progress Report, No. UCRL-15582 S/C 6166601, dated Aug. 1983.
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Mazumder Malay K.
Ware Ron E.
Ciarlante Anthony V.
University of Arkansas
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