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Wavelength modulation waveforms in laser photoacoustic spectroscopy

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Original languageEnglish
Pages (from-to)743-747
JournalApplied Optics
Issue number4
Publication statusPublished - 2009
Publication typeA1 Journal article-refereed


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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