Calibration in a blood analyzer
US4061469A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1975 |
| Grant date | Dec 6, 1977 |
| Priority date | — |
| Expiry date | Dec 8, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N35/00693
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a blood analyzer, improved calibration is provided. First and second photodetectors sense energy supplied directly from a source and from the source through a sample respectively. A log ratio amplifier provides an analog output indicative to the log of the ratio of the outputs of the photodetectors to a control circuit. When a blank sample is measured, a programmable voltage source operates to set the analog output to a selected level. A reference sample having optical density corresponding to a preset value is next measured, and a variable gain amplifier is set by the control circuit to cause the analog signal to correspond to the preset value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.