Method and apparatus for the optical measurement of the concentr

Details Method and apparatus for the optical measurement of the concentr Method and apparatus for the optical measurement of the concentr

1978-06-07

1980-03-18

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

356343, G01N 1506

Patent

active

041936922

ABSTRACT:
An optical concentration measuring apparatus and method which provides an output signal which is a substantially linear function of the concentration. The apparatus includes a chamber for containing a fluid sample and a source of optical radiation which develops a beam which is transmitted through the chamber and the sample. A first photoelectric cell is disposed to receive the transmitted beam for generating an electrical signal commensurate with the intensity of the beam after passage through the chamber and the fluid sample, and a second photoelectric cell which is disposed at a selected angle with respect to the direct beam for providing an electrical signal commensurate with the light scattered in a direction corresponding to the selected signal. The signal commensurate with the scattered beam and the signal commensurate with the direct beam are applied to a signal processor which develops a ratio of these signals, one of the signals being multiplied by a constant. The method allows this constant to be selected so that a signal from the signal processor is substantially linear with the particulate concentration.

REFERENCES:
patent: 3420609 (1969-01-01), Kozawa
patent: 3518437 (1970-06-01), Riggs
patent: 3576558 (1971-04-01), Devries
patent: 3653768 (1972-04-01), Menke
patent: 3988591 (1976-10-01), Killer

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