Digital anesthetic agent analyzer
US4692621A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1985 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Oct 11, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/12723
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas analyzer is described comprising a sample cell for containing a gas mixture to be analyzed, a source for producing and directing infrared energy through the sample cell, a rotary filter wheel having at least one filter thereon for passing infrared energy limited to a wavelength band within the characteristic absorption band of a predetermined gas and having a dark level region substantially opaque to infrared energy, a drive for supporting and rotating the filter wheel to successively interpose the filter and the dark level region between the source and the sample cell in the path of the infrared energy directed by the source, a detector for detecting infrared energy passing through the sample cell and producing an electrical signal representative thereof, and a signal processor connected to the detector for producing an output indicating the concentration of the predetermined gas in the sample cell by comparing the electrical signals produced by the detector with the filter positioned in the infrared energy path and with the dark level region positioned in the infrared energy path. The dark level region has a substantially fully reflective surface oriented toward the sample …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.