Patent ID: 6640199
Filing Date: 2003-10-28
Classification: G01K,G01N

Abstract:
A system for remotely determining at least one of the temperature of, and the relative concentrations of species making up, a hot fluid, based on the spectral structure of radiation emitted from the fluid, comprising:at least one passive optical probe for collecting emitted thermal radiation over a field of view including the hot fluid; a spectrograph for resolving at least a portion of the emission spectrum from the collected radiation; means for decomposing the resolved emission spectrum into a combination of basis spectra that are characteristic of specific emitting species and emitter temperatures in the hot fluid, by fitting the emission spectrum to at least two basis spectra for each species, one basis spectrum incorporating temperature dependent aspects of the emissivity spectrum of that species, and one basis spectrum incorporating temperature-independent aspects of the emissivity spectrum of that species; and means for determining, from the relative amounts of at least two spectra, at least one of the temperature of, and the relative concentrations of species making up, the hot fluid.