Abstract
Tunable laser photoacoustic spectroscopy is attracted as a powerful tool for trace gas detection in environmental applications. A photoacoustic gas sensor using a near-infrared tunable fiber laser and based on wavelength modulation spectroscopy is developed. Continuous measurements of ammonia, carbon dioxide and water vapor in gas mixtures are achieved at atmospheric pressure. The minimum detection limits (signal-to-noise ratio=1) of 6ppb of ammonia, 5ppm of carbon dioxide and 29ppm of water vapor have been demonstrated with the sensor. Ammonia, carbon dioxide and water vapor in ambient air are measured by the sensor.
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