Method for measuring gaseous species by derivation

Details Method for measuring gaseous species by derivation Method for measuring gaseous species by derivation

2007-05-29

2007-05-29

Porta, David (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

Reexamination Certificate

active

10568698

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 CO2contained 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 CO2said 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.

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