Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1979-09-28
1981-09-22
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
356341, 356434, 356442, G01N 2101
Patent
active
042906954
ABSTRACT:
Precise quantification of turbidity is obtainable through multiple determinations of the light attenuation coefficient of the particulate-bearing medium at a plurality of path lengths in the attenuating medium, and through multiple determinations of the scattering coefficient of the particulate-bearing medium at a selected angle of incidence and at a plurality of path lengths in the attenuating medium. In the preferred apparatus, these determinations employ a common light source and a common detector. In the present system, there are eliminated such adverse factors as light-source instability, detector instability, variations in particulate deposits on windows, and other problems, through the use of the ratio of the intensity measurements at different locations in the medium.
REFERENCES:
patent: 3652850 (1972-03-01), Briggs
patent: 4037973 (1977-07-01), Carr
patent: 4125328 (1978-11-01), Suga
Environmental Systems Corporation
McGraw Vincent P.
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