AN OPTICAL MODIFICATION OF A DOUBLE-BEAM INFRARED SPECTROPHOTOMETER FOR ESTABLISHING LINEARITY AT LOW SAMPLE TRANSMISSIONS
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Date
1951
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Publisher
Ohio State University
Abstract
An optical system is described for introducing an auxiliary beam of light into the sample beam path of a Baird Associates double-beam infrared spectrophotometer. The auxiliary-beam intensity is a constant fraction of the reference-beam intensity. This arrangement avoids working in the nonlinear range of the reference-beam attenuator near complete closure. In addition, a dynamically balanced zero is obtained at complete sample absorption, a condition not satisfied by the instrument before the modification was introduced.
Description
Author Institution: The Dow Chemical Company