Turbidimeter

Details Turbidimeter Turbidimeter

1977-02-04

1979-05-01

McGraw, Vincent P.

Optics: measuring and testing

By particle light scattering

With photocell detection

250574, 356442, G01N 2106, G01N 2122, G01N 2126

Patent

active

041520700

ABSTRACT:
A turbidimeter for measuring the turbidity of a sample of fluid comprises a transparent sample cell, a light source for directing a beam of light through the sample cell, and beam separating means comprising a hollow tube and reflective means encompassing the tube. The hollow tube is positioned for receiving unscattered light transmitted through the sample cell and transmitting it to a light responsive detector. The reflective means is positioned and oriented for receiving light scattered by the fluid in the sample cell and directing it to a second light responsive detector. A comparison of the outputs of the two detectors provides a measure of the turbidity of the sampled fluid. This arrangement is compact, economical and shock-resistant, and it provides a measure of turbidity which is relatively unaffected by changes in color, the accumulation of turbid films on the sample cell wall and variations in the intensity of the light source.

REFERENCES:
patent: 3515482 (1970-06-01), Garrow et al.
patent: 3522436 (1970-08-01), Posgate
patent: 3666359 (1972-05-01), Lee
patent: 3785735 (1974-01-01), Friedman et al.
patent: 3788744 (1974-01-01), Friedman et al.
patent: 3850525 (1974-11-01), Kaye
patent: 4043669 (1977-08-01), Gehatia et al.
Electronics, Dec. 20, 1973, pp. 30 and 31.

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