Abstract

We demonstrate an ultralow sample volume optical carbon monoxide sensor with detection sensitivity of 180parts in 109 (1σ at 1Hz). The utilization of a 2.3μm surface-emitting laser directly coupled to a 3m hollow capillary fiber as the gas cell is proven to be a compact, sensitive, and cost-efficient gas sensing concept. By mechanical vibration of the fiber, an absorbance resolution of 105 is achieved, which is comparable to single-reflective (double-pass) cells. An improvement of sensitivity over the conventional single-reflective cell is thus approximately linearly scaled with the enhancement of the optical path length, which is usually more than 1 order of magnitude.

© 2010 Optical Society of America

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