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AssigneeDeutsches Zentrum für Luft- und Raumfahrt e.V.
InventorsPeter Haschberger, Nicholas King, Erwin Lindermeir
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The correction method of the invention synthesizes a distortion-free interferogram (or spectrum) from a measured interferogram, which has been distorted by detector non-linearities, and a finite series of orthogonal functions derived therefrom. The coefficients of the series of functions are selected with a priori knowledge about the limited spectral sensitivity of the radiation detector, preferably with the method of Gaussian least squares fit of observation, such that the resulting spectrum assumes the value of zero of the distortion-free spectrum outside of the sensitivity range, and in freely-definable ranges. The method of the invention can be used to correct detector non-linearities, as occur in Fourier spectroscopy.
A method for the spectroscopic investigation of electromagnetic radiation in the infrared spectrum by means of a Fourier spectrometer, whereby an interferogram is measured as the output signal of a detector comprising a sensor that is sensitive to the radiation to be detected, and amplifier electronics tuned thereto, in such a way that, through correction of a measured output signal I.sub.m, which is distorted due to detector non-linearities, a distortion-free interferogram is approximated by synthesizing a signal I.sub.s that is proportional to the required distortion-free interferogram of the detector from a finite mathematical series of orthogonal functions in such a way that the function terms of said mathematical series are based on the distorted measured output signal I.sub.m of the detector in the form I.sub.s =f(I.sub.m),
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