Methods and devices for near-infrared evaluation of physical properties of samples
US4800279A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1985 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Sep 13, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3577
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods are disclosed for quantifying physical properties of gaseous, liquid or solid samples. The near-infrared absorbance spectra of a representative field of calibration samples are measured and recorded using a spectrophotometer. The absorbance spectra of the calibration samples are evaluated by a row-reduction algorithm to determine which wavelengths in the near-infrared spectrum, and associated weighting constants, are statistically correlated to the physical property being quantified. The near-infrared absorbance of actual samples is then measured at each of the correlated wavelengths, and then corrected by the corresponding weighting constants. A reference value for the physical property being quantified is then computed from the corrected measure of the absorbance of the sample at each of the correlated wavelengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.