Method and apparatus for determining the alcohol concentration in a gas mixture
US5793043A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Dec 19, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/0332
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for determining the alcohol concentration in a gas mixture, which may contain a number of such interference components that have substantial absorption within the range of the alcohol absorption line to be presently determined, by means of a method based on the absorption of infrared radiation. The apparatus comprises: a radiation source (1); a chamber (4) for receiving a gas mixture (6) to be measured, said chamber being provided with windows (7a, 7b) whereby a radiation (2) passes through the gas mixture; a detector (13) which receives the radiation having passed through the gas mixture and transforms it to an electric state for further processing; between the radiation source and the detector an optical interference filter (10), which has a narrow radiation transmission band and which is pivotable (P) relative to the main traveling direction of radiation for changing the wavelength range of the filter's transmission band. The transmission band of the optical interference filter (10) has a mean wavelength which is within the range of 7.5 .mu.m-12.5 .mu.m and this transmission band of the interference filter (10) has a half-width which is more than 1.5% of said mean w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.