Apparatus and method for measuring particle size distribution by light scattering
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United States of America Patent
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Nov 17, 2020
Grant Date -
May 21, 2015
app pub date -
Sep 11, 2012
filing date -
Sep 14, 2011
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Abstract
Apparatus (200) for measuring the particle-size distribution of a sample by light-scattering comprises a focusing optic (202) for producing a converging beam (203) generally along a propagation axis z. The apparatus comprises a mounting system which allows a dry sample cell (208A) and a wet sample cell (208B) to be mounted in the converging beam at different times and in respective planes which are mutually inclined so that in use of the apparatus respective positions (212, 214) at which transmitted light is focused for the two cells have a difference in displacement from the z axis that is less than for the case where the respective planes are substantially parallel. This allows use of a cheaper and less complex translation stage within the apparatus for mounting an optical detector for locating the two focus positions.
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