Abstract

A compact absorption spectrometer with a midinfrared tunable quantum cascade laser operating at 4.86 µm2054 cm-1 is used to measure lower concentrations of carbonyl sulfide (COS) in air. A detection sensitivity of 30 parts in 109 of COS and the selectivity of two stable isotopes,  12C16O32S and  12C16O34S, are demonstrated. Specifically, the feasibility of detecting COS in expired human breath as a potential noninvasive medical diagnostic tool is investigated.

© 2003 Optical Society of America

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