Abstract

A new double beam infra-red spectrometer recording directly in percent transmission vs. wave-length has been built on the principles described by Wright. The spectrometer and recorder are a single unit (40″ long, 22″ high, 20″ wide) with external amplifier and power supplies. The instrument makes direct reading transmission records on 34″×11″ charts; employs a 60° Littrow mounted rock salt prism with 60×75-mm faces; has 5″ of length available for sample cells in each beam. Wave-lengths and slit widths are read directly on Veeder counters. Wave-length scanning speed varies from about five minutes to 200 hours for the rock salt region; speed of response from about 4 seconds to over a minute for full scale, with the possibility of a further increase to five minutes if needed; resolution from close to the theoretical limit of the prism to about a tenth as much; paper drive speeds to give uniform scales from 1 to 50 inches per micron by integral factors. By changing cams, spectra can be recorded on constant wave number of other scales. Changes may be made to accommodate prisms of LiF, KBr and other materials. The general features and arrangement of the new instrument are described in this paper. Its detection, amplification and electrical control systems will be described in detail in a second paper. A third paper will give its performance in various types of operation.

© 1950 Optical Society of America

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