A Rapid Infra-Red Gas Analyzer

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Abstract
A brief description of an apparatus, together with a few representative curves, is presented, suitable for measuring the composition of very small amounts of any gas having at least one near infra-red absorption band or, if measured in the presence of other gases, at least one unique absorption band. With the bolometers used, 90 percent full scale response is obtained in 0.15 seconds on a 0.5 cc sample, permitting a 0.4 cm optical path and a very nearly linear response over the range usually found in physiological concentrations and anesthesia.
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