Method for measuring gaseous species by derivation
US7223978B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2004 |
| Grant date | May 29, 2007 |
| Priority date | — |
| Expiry date | Aug 31, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/359
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method for measuring the quantity of chemical species contained in a high-temperature gas, and especially the quantity of CO and/or CO2 contained in a gas emitted from a metal treating furnace, especially a light-arc furnace (EAF) or a converter (BOF). According to the invention, part of the gas to be analysed is extracted, the temperature of said gas is reduced to at least 300° C., preferably to a temperature that is lower than or equal to 200° C., in such a way as to obtain a at a temperature between 300° C., preferably 200° C., and the ambient temperature, and at least the quantity of CO and/or CO2 said gas is then measured by means of the coherent light signal which is emitted by a laser diode through the gas and is retrieved on emergence from the gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.