BICHROMATOR ANALYZER
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Date
1952
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Publisher
Ohio State University
Abstract
The bichromator is a device which measures the transmission of a sample at some wavelength, $\lambda_{1}$, relative to its transmission at a second wavelength, $\lambda_{2}$. An absorption maximum is normally chosen for $\lambda_{1}$, and $\lambda_{2}$ is preferably an adjacent wavelength at which the sample has little or no absorption. The instrument employs the conventional Littrow arrangement with a horizontally split Littrow mirror pair to cause the two wavelengths to overlap at the exit slit. A unique advantage over double beam systems is the use of only one typical path and sampling cell. Simultaneous comparison of the two wavelengths is made by a sector placed at a conjugate to the Littrow mirrors. Operation of a laboratory model is described. It is shown that analysis is possible in the presence of interfering components. The process control applications of the instrument are discussed.
Description
Author Institution: The Perkin-Elmer Corporation