Measurement cell for water vapor sensor
US5449912A · kind A · utility
9Cited by
4References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1994 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Jun 15, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An absorption cell of the type used to measure gas concentrations by pressure fluctuations of the concentrated gas in an IR radiation field, wherein the IR radiation through the field is affected by the pressurized gas fluctuations to thereby provide an electrical measurement of gas concentration. The sensitivity, linearity and accuracy of the measured gas concentration is improved by controlling the surface roughness of the interior walls of the measurement cell; the wall roughness is preferably controlled to between 15 and 70 microinches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.