Patent ID: 6844934

Claim:
An apparatus for measuring turbidity of a liquid, said apparatus comprising: a lens tube having a curved wall of transparent material and an aperture for receiving the liquid; a first light emitter positioned adjacent the lens tube to produce a beam of light which diverges at a predefined angle and impinges the wall of the lens tube; a first light detector positioned adjacent the lens tube diametrically opposite to the first light emitter to produce a signal indicating an intensity of light traveling through the liquid from the first light emitter; and a second light detector positioned adjacent the lens tube to produce a signal indicating an intensity of light from the first light emitter which is scattered upon traveling through the liquid; wherein the diverging beam of light from the first light emitter is refracted by the lens tube into a collimated beam within the aperture, and light from within the aperture is refracted by the lens tube onto the first light detector and the second light detector.