Method and apparatus for gas analysis
US4163899A · kind A · utility
17Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1978 |
| Grant date | Aug 7, 1979 |
| Priority date | — |
| Expiry date | Jun 19, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3518
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus are described for detecting a selected gas in an unknown gas sample. The power output of a radiant energy source is modulated at a first frequency and passed through the sample, the density of the sample being varied at a second frequency. The radiant energy passing through the sample is detected by and converted to an electrical signal which is then processed in order to produce an output signal representative of the selected gas. Density of the sample is preferably modulated or varied periodically by means of a pulsating pump which also supplies the unknown gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.