Patent ID: 6894778
Filing Date: 2005-05-17
Classification: G01N

Abstract:
1. A turbidimeter for measuring the turbidity of a liquid containing particles, comprising: (a) sample receiving chamber means having inlet and outlet means for liquid sample ingress into said chamber means and egress therefrom; (b) light source means for projecting a light beam into said chamber means; wherein said light source means further comprises a collimating lens for collimating said light beam; wherein said light source means is free of surfaces on which condensation may occur; (c) detector means for detecting light scattered by said particles in said liquid sample in said chamber means; wherein said detector means has a field of view which intersects said light beam in said chamber means; wherein said detector means further comprises focus means for focusing said light scattered by said particles in said field of view; wherein said focus means is free of surfaces on which condensation may occur; and (d) first and second light trap means for trapping said light beam and preventing; wherein said first light trap means prevents said light beam from radiating to said detector means as stray light; and wherein said second light trap means prevents the detector field from extending beyond said second light trap.