Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1995-08-11
1997-05-06
Epps, Georgia Y.
Optics: measuring and testing
For size of particles
By particle light scattering
G01N 1502
Patent
active
056276427
ABSTRACT:
A method and apparatus of determining the size of particles executing Brownian motion is provided. An integrated fiber optic probe, including a length of a gradient index multimode optical fiber fusion spliced to a monomode optical fiber, delivers laser light to a scattering medium such that the light scattered in the backward direction is collected by another integrated fiber optic probe mounted into the same cylindrical housing. The scattered light, after conversion to a series of photoelectron pulses, is processed to determine the mean particle diameter. The temporal coherence of the scattered field from submicroscopic particles illuminated by laser light is a function of both the integration time and the particle diameter. The temporal degree of coherence of the time averaged scattered intensity decreases as the integration time increases. Statistical processing of the scattered photons leads to a new method of particle sizing, which circumvents the need for digital autocorrelation.
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Dhadwal Harbans S.
Suh Kwang I.
Epps Georgia Y.
Merlino Amanda
The Research Foundation of State University of New York
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