Abstract

A new method for hand-integration of curves obtained on a General Electric-type recording spectrophotometer has been developed for use where accurate results are desired. A retardation plate is used for constructing a wavelength grid by setting the pen at a maximum or a minimum of the transmission curve of the plate and then allowing the pen to travel up and down the paper. This makes available approximately 55 ordinates for the integration. The curve, plotted on semitransparent paper, is aligned over the grid, and the reflectance or transmittance for each of the grid lines is read off. Each value is then multiplied by an appropriate factor, and the products are summed to give the tristimulus value. This method avoids the tedium and loss of precision of the usual method which makes use of a correction curve derived from the didymium peaks. Errors of paper positioning and irregularity in the wavelength cam will not affect the results by the proposed method.

© 1956 Optical Society of America

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