Apparatus for determining the concentration of the components of a sample
US4267572A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Apr 3, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for determining the concentration of the various components of a sample, which includes a spectrophotometer for receiving a sample to be analyzed and performing extinctions of the sample at a plurality of preselected wavelengths to form a sample spectrum; memory devices for storing a standard spectra of each of the individual components; circuitry for weighting the sample spectrum at different wavelengths in conformity with each of the standard spectra and providing estimated values of the concentrations of the components from the sample spectra thus weighted; circuitry for reconstructing the sample spectrum as a linear combination of the estimated values of the concentrations and the standard spectra; a subtractor for forming a difference spectrum from the sample spectrum and the reconstructed sample spectrum; circuitry for weighting the difference spectrum at different wavelengths in conformity with each of the standard spectra and providing corrective values of the concentrations of the components from the difference spectrum thus weighted, and means for reconstructing the difference spectrum as a linear combination from the corrective values of the concentrations and …
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