S N ENHANCEMENT OF RAMAN-SPECTRA USING AN INTERACTIVE FILTER/

The use of an interactive filter for smoothing Raman spectra is descri bed. It is applied by fitting a polynomial to a limited range of data in a spectrum using the least-squares criterion. It provides a variabl e band-pass with very sharp cutoff without generating ringing artifact s. Its use is demonstrated in tailoring of the filter bandpass to the requirements of individual spectral features, in detection of weak pea ks in a noisy spectrum, and in detection of minor component signals wh en these are superimposed on major component signals.