Wavelength modulation waveforms in laser photoacoustic spectroscopy

被引：15

作者：

Saarela, Jaakko ^{[1
]}

Toivonen, Juha ^{[1
]}

Manninen, Albert ^{[1
]}

Sorvajarvi, Tapio ^{[1
]}

Hernberg, Rolf ^{[1
]}

机构：

[1] Tampere Univ Technol, Dept Phys, Opt Lab, FI-33101 Tampere, Finland

来源：

APPLIED OPTICS | 2009年 / 48卷 / 04期

关键词：

TRACE GAS-ANALYSIS; CARBON-DIOXIDE; MU-M; DIODES;

D O I：

10.1364/AO.48.000743

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C) 2009 Optical Society of America

引用

页码：743 / 747

页数：5

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