System and method for determining the chemical composition of liquid metallurgical products

A device for determining the chemical composition of a liquid metallurgical product emitting electromagnetic radiation, the device comprising:

• a collection probe configured to acquire the electromagnetic radiation emitted by the metallurgical product in a predetermined wavelength range 4;
• a spectroscopic device connected to the collection probe and configured to generate a spectral signal of the acquired electromagnetic radiation;
• and
• a processor configured to calculate an observed radiance Lobs(λ, Test) from the generated spectral signal, and to estimate, from the calculated observed radiance Lobs(λ, Test), the temperature Test and the spectral emissivity εest(λ, Test) of the metallurgical product in the predetermined wavelength range Δ,
• wherein the processor includes a database of reference radiances Lref,i(λ, Terf,n) of X samples i, i varying from 1 to X, in the predetermined wavelength range Δλ and Z reference temperature Tref,n, n varying from 1 to Z, comprising for each reference radiance:
• reference spectral emissivities εref,i(λ, Tref,n), associated to reference temperatures Tref,n in the predetermined wavelength range Δλ, and
• chemical compositions of the samples i,
• the processor configured to compare estimated spectral emissivity εest(λ, Test) and estimated temperature Test with reference temperatures Tref,n and reference spectral emissivities εref,i(λ, Tref,n) in the predetermined wavelength range Δλ and at estimated temperature Test included in said database, to determine a best fitting reference radiance Lbf(A, Tref) with the observed radiance Lobs(λ, Test), and
• to determine the chemical composition of the liquid metallurgical product from the determined best fitting reference radiance Lbf(λ, Tref).