Abstract
A compact absorption spectrometer with a midinfrared tunable quantum cascade laser operating at is used to measure lower concentrations of carbonyl sulfide (COS) in air. A detection sensitivity of in of COS and the selectivity of two stable isotopes, and , 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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