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Ammonia detection by using quantum-cascade laser photoacoustic spectroscopy

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Abstract

A pulsed quantum-cascade distributed-feedback laser, temperature tunable from 41°C to +31.6°C, and a resonant differential photoacoustic detector are used to measure trace-gas concentrations to as low as 66 parts per 109 by volume (ppbv) ammonia at a low laser power of 2 mW. Good agreement between the experimental spectrum and the simulated HITRAN spectrum of NH3 is found in the spectral range between 1046 and 1052 cm1. A detection limit of 30  ppbv ammonia at a signal-to-noise ratio of 1 was obtained with the quantum-cascade laser (QCL) photoacoustic (PA) setup. Concentration changes of 50  ppbv were detectable with this compact and versatile QCL-based PA detection system. The performance of the PA detector, characterized by the product of the incident laser power and the minimum detectable absorption coefficient, was 4.7×109  W cm1.

© 2006 Optical Society of America

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