Cell construction for light scatter detectors having self-focusing properties
AssigneePostnova Analytics GmbH
InventorDiethelm Fröse
Life of this patent
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Abstract
The invention relates to a device and to a method for measuring the scattered light about molecules present in a suspension, wherein the suspension is fed through a measurement cell. The measurement cell is produced as a segment of a curved surface, particularly an ellipsoid, a hyperbolic shape, a parabolic shape, or a circle, and comprises a curved and a flat surface. Light-sensitive detectors are disposed about the curved surface and capture the scattered light.
Claims13
A device for measuring light scattering properties of a suspension which is fed through a sample cell and is irradiated by a monochrome collimated light beam, the device comprising:
- a sample cell (1) has a channel (2) which permits feed and discharge of the suspension, and which allows a monochrome collimated light beam (3) to pass in, pass through and pass out in the direction of the channel length,
- wherein a cell geometry of the sample cell (1) displays a curved surface (7), and the sample cell is formed from transparent material and focuses light (4) scattered horizontally in a specific angle by a curved surface (7) of the sample cell (1) onto a point outside the sample cell to achieve focussed light, and
- wherein light-sensitive detectors (5) are arranged in the point onto which the light is focussed so that the light-sensitive detectors collect the focussed light (4) which is scattered by a suspension and which passes through the channel and the transparent material of the sample cell (1).
A method for measuring light (4) scattered on molecules present in a suspension, the method comprising the steps of:
- a. feeding a suspension through a channel (2) that extends along an axis through a sample cell (1),
- b. running a collimated, monochrome light beam (3) along the channel,
- c. passing scattered light beams (4) running in parallel and scattered horizontally in a specific angle through the curved shape (7) of the sample cell (1),
- d. focussing the horizontally scattered light beams by the polished, curved shape of the sample cell (1) onto a point outside the sample cell to achieve focussed light, and
- e. collecting the focussed light by light-sensitive detectors (5) arranged horizontally and vertically to the channel (2), in the point onto which the scattered light is focussed.
Dependencies are inferred from the claim text.