Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1996-09-25
2000-07-18
Rosenberger, Richard A.
Optics: measuring and testing
For size of particles
By particle light scattering
350343, G01N 1502
Patent
active
060914920
ABSTRACT:
An apparatus and method are disclosed for obtaining and analyzing light scattering data to determine the size distribution of a group of dispersed particles that scattered the light. The apparatus and method use a two-dimensional array of photosensitive pixels such as a charge-coupled device (CCD) or an array of solid-state photodiodes. The analyzer illuminates the particles with a dose of light in a collimated beam from a light source so as to scatter light of the beam, and at least a portion of the light interacting with the particles is detected with the photosensitive pixel array. The pixels are functionally equivalent and the analyzer dynamically configures and re-configures at least a portion of the pixels into a variable number of data collection areas which correspond to a selected set of scattering angles. The analyzer also determines whether and, from the pixel output data, where an unscattered center of the incident light beam intersects the pixel array. Thus, no precision mechanical alignment of the light source and the pixel array detector is required prior to operation of the analyzer. Furthermore, the ability of the analyzer to determine the unscattered beam center allows the analyzer to classify each of at least a portion of the pixels to data collection areas according to a function of the geometric relationship the pixel bears to the location of the beam center.
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Conklin William B.
Hendrix Warren P.
Olivier James P.
Strickland Michael L.
Anderson Albert S.
Micromeritics Instrument Corporation
Rosenberger Richard A.
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