Abstract

A retardation plate is used to make a “calibrator” having a known transmission curve. It is shown how the effect of slit width and slit shape on the plotted transmission of the calibrator can be predicted and conversely how the width and shape of an assumed slit may be evaluated from the performance of a spectrophotometer in plotting the transmission of the calibrator. If it is assumed that the slit is trapezoidal, it is recommended that it be described on an over-all performance basis in terms of two factors, H the slit width and f the shape factor. Regardless of the assumed slit geometry it is probable that two spectrophotometers that give similar transmission data for a calibrator will give similar curves for other types of samples.

© 1945 Optical Society of America

Uses of Retardation Plates in SpectrophotometryII. Calibration of Wave-Length

George L. Buc and E. I. Stearns
J. Opt. Soc. Am. 35(7) 465-470 (1945)

Uses of Retardation Plates in SpectrophotometryIII. Measurement of Dichroic Samples

George L. Buc and E. I. Stearns
J. Opt. Soc. Am. 35(8) 521-524 (1945)

A Spectrophotometer for the Determination of the Water Vapor in a Vertical Column of the Atmosphere

Norman B. Foster and Laurence W. Foskett
J. Opt. Soc. Am. 35(9) 601-610 (1945)

New Etching Pattern of Quartz and Its Uses for the Determination of Electric Axes and the Detection of Crystalline Defects

Choong Shin-Piaw
J. Opt. Soc. Am. 35(8) 552-558 (1945)

Errata: Uses of Retardation Plates in SpectrophotometryIII. Measurement of Dichroic Samples

George L. Buc and E. I. Stearns
J. Opt. Soc. Am. 35(11) 742-742 (1945)