A new nonnegative-constrained decon volution method is proposed to restore the original spectrum from its observation blurred by the slit-function of a spectrophotometer. The developed method is based on the Nonnegative Least Squares Method incorporating with the Minimum Mean Squared Error Estimation. Using
a priori knowledge about the longi tudinal axis of the spectrum as a constraint, the method may expand the band limit of the system or the resolution limit determined by the conventional Wiener-Helstrom filter due to the existence of noise. Experimental results by the proposed method for the spectra of emission lines of a hollow cathod lamp and infrared absorption of amnmonia gas demonstrate the effectiveness of the method.
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