Self-calibrating carbon dioxide analyzer
US4578762A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1983 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Jul 1, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/12723
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A carbon dioxide analyzer for medical purposes is rendered self-calibrating by continuously measuring pairs of two or three each of several components as follows: PA0 1st pair: vacuum cell, open hole and sample cell reference cell, open hole and sample cell PA0 2nd pair: vacuum cell, standard cell reference cell, standard cell PA0 3rd pair: vacuum cell, open hole reference cell, open hole PA0 4th pair: vacuum cell, standard cell, sample cell reference cell, standard cell, sample cell The ratios of these measurement pairs are treated mathematically in a computer or microprocessor to obtain a reading for CO.sub.2 and to correct other readings and to monitor the integrity of the standard cell. A novel two-wheel chopper and mirror arrangement facilitates the measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.