Patent ID: 8269953

Claim:
A device for measuring stray light in optically dense liquids comprising: a casing having at least one flat surface; a light-transmissive flexible tube for transporting an optically dense liquid, said flexible tube having a tube wall and being fitted within the casing such that at least one portion of the tube wall is pressed against the at least one flat surface and is thereby flattened; a light emitter having a first optical axis, wherein the first optical axis is substantially perpendicular to the at least one flattened portion of the tube wall; and a light detector having a second optical axis, wherein said light emitter is configured such that light passes through the at least one flattened portion of the tube wall prior to passing into an interior portion of said tube, wherein the first optical axis and the second optical axis form an angle of less than about 90°, and wherein the intersection of the first optical axis and the second optical axis is located in an area of the interior portion extending from a media boundary between the at least one flattened portion of the tube wall and the optically dense liquid and up to about 0.5 mm into the optically dense liquid.