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Development of an Enhanced Cavity Absorption Sensor for Air Monitoring

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Abstract

The progress on the development of a sensor for the detection of ambient levels of a set of air contaminants is reported. A 1.55 µm external-cavity tunable diode laser is used as a light source that can be incorporated into either Integrated Cavity Output Spectroscopy (ICOS) or cw-Cavity Ringdown Spectroscopy (cw-CRDS). Both techniques exploit the sensitivity enhancements provided by the long effective pathlength from the optical cavity created between two mirrors. Initial experiments of ICOS and cw-CRDS have been performed to determine the sensitivity, selectivity, and reproducibility of this method. In the continuing work, the sensitivity of cw-CRDS will be compared with ICOS to determine which method holds greater promise for a practical sensor.

© 2002 Optical Society of America

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