Sample cell for diffraction-scattering measurement of particle size distributions
AssigneeHoriba, Ltd.
InventorsYoshiaki Togawa, Tatsuo Igushi, Koichiro Matsuda
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Abstract
A sample cell for use in measuring the particle size distribution of samples using diffraction-scattering measurement methods has a radiating surface which is beveled to increase the angle of incidence of scattered light which is scattered at a large scattering angle such that it is transmitted through the radiating surface of the sample cell and thereby allowed to impinge upon a detector.
Claims15
An apparatus for making diffraction-scattering measurement of a particle size distribution of a sample, comprising:
- a sample cell for allowing a liquid containing particulates to flow through an internal space of the sample cell, the sample cell being irradiated by a light beam, said light beam entering said sample cell through an entrance surface of said sample cell;
- the light component being diffracted-scattered by the particulates to produce an intensity pattern, the intensity pattern emerging through an exit surface of the sample cell, and
- optical detector means operatively positioned for detecting said intensity pattern emerging from said exit surface;
- the exit surface having at least two portions, said portions being beveled with respect to each other to provide increased transmission of the diffracted/scattered light pattern to the detector, one of said portions being perpendicular to the beam.
A sample cell for use in diffraction-scattering measurements of particle size distributions of a sample containing particulates, wherein the sample cell accepts an incident light beam and has an exit surface from which an intensity pattern provided by the light beam emerges, said exit surface having at least two portions beveled with respect to each other, the beveled portions allowing light diffracted/scattered by particulates within said sample cell to be transmitted through the exit surface to a detector, steeply scattered portion of said light beam passing through at least one portion which is not perpendicular to the incident beam, and wherein at least one portion is perpendicular to the light beam to allow diffracted light to be measured.
An apparatus for making diffraction-scattering measurements of particle size distribution of a sample, comprising:
- means for providing a beam of light along an optical axis;
- a sample cell for containing a sample having particulates suspended in a liquid, said sample cell having an entrance surface and an exit surface, said entrance surface receiving said beam of light, said particulates being of sizes sufficient to diffract-scatter portions of said beam of light to produce an exit beam having an intensity pattern, said exit beam emerging from said sample cell through said exit surface at diffraction/scattering angles determined by the size of the particles;
- said ext surface comprising at least first and second planar surfaces angled with respect to each other, with at least one of said planar surfaces being perpendicular to said optical axis, and with a first portion of said exit beam emerging through sad first planar surface and a second portion of said exit beam emerging through said second planar surface;
- and
- an optical detector means for detecting said intensity pattern emerging from said exit aperture, said optical detector means having at least first and second detectors with sad first detector receiving light emerging from said sample cell from said first planar surface and said second optical detector receiving light emerging from said sample cell from said second planar surface.
Dependencies are inferred from the claim text.