Method and apparatus for examining fluids of biological origin
US6882425B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2000 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Oct 11, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/274
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A quality test of fluids of biological origin can be performed optically with applying a suitable evaluation method. In case of two components to be determined in a such fluid, an extinction spectrum is approximated in a first wavelength range by a combination of a merely theoretical curve and the spectrum of the pure first substance in a first wavelength range, and this evaluation is repeated in a second wavelength range this time by approximating the measured spectrum (62) by a combination of a hypothetical curve, the spectrum (64) of the first component with the already determined concentration, and the spectrum (65) of the pure second component. Furthermore, it is feasible to subtract the first and second spectrum and analyze the so obtained differential spectrum (66) in view of anomalies. The hypothetical curves are preferably straight lines which are defined by slope and ordinate section. In the praxis of the quality test of blood, bilirubin and hemoglobin may be quantitatively be determined, whilst the background together with the lipid component can be qualitatively examined by means of the differential spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.