Novel Helmholtz-based photoacoustic sensor for trace gas detection at ppm level using GaInAsSb/GaAlAsSb DFB lasers

被引：36
作者：
Mattiello, M
Niklès, M
Schilt, S
Thévenaz, L
Salhi, A
Barat, D
Vicet, A
Rouillard, Y
Werner, R
Koeth, J
机构：
[1] Omnisens SA, CH-1015 Lausanne, Switzerland
[2] Ecole Polytech Fed Lausanne, Lab Nanophoton & Metrol, NAM, CH-1015 Lausanne, Switzerland
[3] Univ Montpellier 2, Ctr Elect & Microelect Montpellier, CEM2, UMR CNRS,5507, F-34095 Montpellier 05, France
[4] Nanoplus Nanosyst & Technol GmbH, D-97218 Gerbrunn, Germany
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2006年 / 63卷 / 05期
关键词：
photoacoustic spectroscopy; antimonide; semiconductor lasers; trace gas monitoring; Helmholtz resonator;
D O I：
10.1016/j.saa.2005.11.006
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
A new and compact photoacoustic sensor for trace gas detection in the 2-2.5 mu m atmospheric window is reported. Both the development of antimonide-based DFB lasers with singlemode emission in this spectral range and a novel design of photoacoustic cell adapted to the characteristics of these lasers are discussed. The laser fabrication was made in two steps. The structure was firstly grown by molecular beam epitaxy then a metallic DFB grating was processed. The photoacoustic cell is based on a Helmholtz resonator that was designed in order to fully benefit from the highly divergent emission of the antimonide laser. An optimized modulation scheme based on wavelength modulation of the laser source combined with second harmonic detection has been implemented for efficient suppression of wall noise. Using a 2211 nm laser, sub-ppm detection limit has been demonstrated for ammonia. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：952 / 958
页数：7
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