Patent ID: 9500528
Filing Date: 2016-11-22
CPC Classification: G01J

Claim Text:
1. A method for non-contact determination of temperature of a metal melt in a furnace having at least one burner-lance unit which is fed above the metal melt through a furnace wall of the furnace into a furnace chamber, by at least one temperature measuring unit downstream from the at least one burner-lance unit, comprising: operating the at least one burner-lance unit in lance mode to convey a flow of at least one gas into the furnace chamber at supersonic speed; blowing away slag from a surface of the metal melt by the flow of the at least one gas; embodying the flow of the at least one gas over a first period of time by a first gas including oxygen; switching from the first gas to a second gas that is inert, while retaining the lance mode over a second period of time; permanently obtaining a metal melt temperature, at least within the second period of time, by detecting an obtained temperature of the metal melt; and accepting the obtained temperature as a valid measurement of the metal melt temperature when the gas flow is in a laminar state and after the obtained temperature has fluctuated by a maximum of 1% over a third period of at least 2 seconds.