Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1990-08-20
1996-03-26
Rosenberger, Richard A.
Optics: measuring and testing
For size of particles
By particle light scattering
356338, C01N 1502
Patent
active
055025617
ABSTRACT:
A new class of methods for characterizing particles is described along with associated apparatuses. These methods are called modulated dynamic light scattering (MDLS) methods because they utilize time and space modulations of the incident or scattered light as well as modulations caused by random Brownian motions of the particles, for example, to measure particular properties. The autocorrelation function of the scattered light signal from a particle is measured to provide a highly resolved signature even when the signal is buried in noise. The dynamics of the scattered light signal from a suspended particle undergoing random Brownian translations and rotations is analyzed to obtain the relationship of the particle's properties to its autocorrelation function signature. By comparison of the theoretical and measured functions, properties of a particle suspended in a (1) liquid, (2) gas, or (3) rarefied gas can be determined. In cases (1) and (2) the general shape category, velocity, and translational friction coefficient of the particle and in case (3) these properties and the mass of the particle are determined. The particle charge and charge-to-mass ratio can also be determined in cases (2) and (3). In addition, other analytical techniques can also be used to determine information about the chemical and biological nature of the particle. Distributions of particles over one or more properties, singly or jointly, can then be precisely determined from a large number of individual particle measurements and particles of a species having a unique set of properties can be individually identified.
REFERENCES:
patent: 4807990 (1989-02-01), Keefer
Mazumder, M. K. "Laser Doppler Velocity Measurement Without Directional Ambiguity by Using Frequency Shifted Incident Beams" Applied Physics Letters, vol. 16, No. 11 (1 Jun. 1970) pp. 462-464.
Berne et al. Dynamic Light Scattering John Wiley & Sons, Inc. New York copyright 1976, pp. 53-88.
Dahneke Barton E.
Hutchins Darrell K.
Board of Trustees of the University of Arkansas
Dugas Edward
Rosenberger Richard A.
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