Patent ID: 7659980

Claim:
A nephelometric turbidity sensor device for measuring solid particle concentrations in a fluid comprising: A double walled structure having an light-tight exterior container and one or more fluid-tight light-tight housings, wherein the structure incorporates light receiving and light emitting elements; said light-tight exterior container to contain a fluid to be measured and having a fluid inlet and at least one fluid outlet to provide fluid flow through the container, and having a non-reflective inner surface; said fluid-tight light-tight housing having a lamp module comprising a light source that generates a focused light beam, and transparent window module; a first optical element for focusing and directing the light emitted from the light source through a window module into the to-be-measured fluid; a second optical element, for collecting a portion of scattered light which is generated when the focused light beam strikes particles in the fluid in the container, directs said collected scattered light onto a scattered light detector; said scattered light detector converts incident light to an electrical signal and transmits it to the scattered light receiver which transforms the electrical signal for further processing; an electronic circuit board that further processes electrical signals from the scattered light detector and scattered light receiver; wherein the improvement is: said nephelometric turbidity device comprises a combination of multiple absorbing and reflective elements for attenuation of extraneous scattered light signals.