Precision Computer Measurement of Spectra

Abstract

A digital computer has been programmed to do the complete job of finding and measuring each spectral line in an absorption or emission spectrum. The outputs of position, wavenumber or wavelength, log intensity, and shape of each line are similar to those obtained by a skilled operator using a photoelectric comparator, but are more consistent and are obtained much more rapidly. Many data points on each line are used, and precision measurements can be made on lines covering an intensity range of over 103. Many spectra have been processed since the first successful operation in 1962. Continuing improvements to both the apparatus and the computer program are being made. Future plans include a more direct connection to the large digital computer, programmed computer control of the apparatus, computer enhancement of the spectral resolution, and the application to spectrochemical analysis. This system is not limited to optical spectra. Any set of data with peaks or depressions can be processed so as to measure these peaks or depressions. Successful runs have been made on many kinds of spectra.