Method and apparatus for measurement of transmittance and scatter of light in water
US4290695A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1979 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Sep 28, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/532
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.