Optics: measuring and testing – For size of particles – By particle light scattering
Reexamination Certificate
2007-03-06
2007-03-06
Rosenberger, Richard A. (Department: 2877)
Optics: measuring and testing
For size of particles
By particle light scattering
C356S342000
Reexamination Certificate
active
09297895
ABSTRACT:
A system (20) and method are disclosed for the self-calibrating, on-line determination of size distribution f(x) and volume fraction φ of a number of particles (P) dispersed in a medium (M) by detecting one or more propagation characteristics of multiply scattered light from the particles (P). The multiply scattered light is re-emitted in response to exposure to a light source (21) configured to provide light at selected wavelengths. The determination includes calculating the isotropic scattering and absorption coefficients for the particles (P) by comparing the incident and detected light to determine a measurement corresponding to the propagation time through the scattering medium (M), and iteratively estimating the size distribution f(x) and volume fraction φ as a function of the coefficients for each of the wavelengths. An estimation approach based on an expected form of the distribution and the mass of the particles is also disclosed. Furthermore, techniques to determine a particle structure factor indicative of particle-to-particle interactions which vary with particle concentration and influence light scattering at high concentrations is disclosed.
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Balgi Ganesh
Jiang Huabei
Kao Jeffrey
Pierce Joseph
Richter Steven
Baker & Botts L.L.P.
Rosenberger Richard A.
The Texas A&M University System
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