Method for analysing a gas by means of double illumination
US11448590B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Feb 1, 2019 |
| Grant date | Sep 20, 2022 |
| Priority date | — |
| Expiry date | Feb 1, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/3196
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method—for measuring an amount of a gaseous species present in a gas—comprises placing the gas between a light source and a measurement photodetector. The light source is able to emit an incident light wave that propagates through the gas to the measurement photodetector. The gas is illuminated with the light source. A measurement intensity, of the light wave transmitted by the gas, is measured with the measurement photodetector. An intensity of a reference light wave, emitted by the light source in a reference spectral band, is measured with a reference photodetector. The illumination and measuring are performed at multiple measurement times, at each of which the gas's absorption of the incident light wave is estimated and an amount of the gaseous species is estimated on the basis of the estimated absorption. Estimating the absorption comprises applying a correction function, that varies over time, to the reference intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.