DIGITAL SMOOTHING OF INFRARED SPECTRA
Publisher:
Ohio State UniversityAbstract:
Using our mini-computer (PDP-12) on line with our spectrometer, we have investigated the effects on spectral lines and on noise of digital least squares smoothing by convolution. We use the algorithm made popular by Savitzky and $Golay.^{1}$ The most important ``parameter’’ is the length of the smoothing range. For single lines we can show that for maximum discrimination against noise with minimum effect on line height, half-width, and shape, one should smooth only once with a smoothing range equal to the full-width at half-height. To smooth over a range longer than 25 sample points we use the general equation for the coefficients of the convolution, as given by Whittaker and $Robinson.^{2}$ We are now investigating the effects of smoothing on overlapping lines.
Description:
This research was supported by the National Science Foundation $^{1}$A. Savitzky and M. Golay, Anal. Chem. 36, 1627 (1964). $^{2}$E. Whittaker and G. Robinson, The Calculus of Observation, p. 295. (Dover, 1967).""
Author Institution: Department of Physics, Michigan State University
Author Institution: Department of Physics, Michigan State University
Type:
articleOther Identifiers:
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