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URN:
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http://URN.fi/URN:NBN:fi:tty-201104153161
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Title:
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Wavelength modulation waveforms in laser photoacoustic spectroscopy |
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Author:
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Saarela, Jaakko; Toivonen, Juha; Manninen, Albert; Sorvajärvi, Tapio; Hernberg, Rolf |
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Publication type:
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Artikkeli - Article |
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Issue date:
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2009 |
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DOI:
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http://dx.doi.org/10.1364/AO.48.000743
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Description:
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Copyright 2009 The Optical Society |
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University:
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Tampereen teknillinen yliopisto - Tampere University of Technology |
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Faculty:
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Luonnontieteiden ja ympäristötekniikan tiedekunta – Faculty of Science and Environmental Engineering |
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Department:
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Fysiikan laitos |
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Abstract:
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Different wavelength modulation waveforms were studied comprehensively in tunable diode laser photoacoustic spectroscopy. The generation of the photoacoustic signal was studied by way of simulations and experiments. A cantilever-enhanced photoacoustic detector and CO2 sample gas were used in the experiments. The modulation waveforms compared in this study were sinusoidal, triangular, shaped, and quasi-square waves. All four waveforms allow background-free detection of trace gases. Compared to the conventionally used sinusoidal modulation, the triangular, shaped, and quasi-square waves enhanced the photoacoustic signal by factors of 1.12, 1.42, and 1.57, respectively. |
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Copyright:
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This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. |