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Proceedings Paper

Acetylene measurement using quantum cascade lasers at 14μm
Author(s): J. Herbst; B. Scherer; F. Singer; J. Erb; A. Lambrecht; C. Rathke; S. Filip; J. Kappler; P. Fuchs; J. Koeth; J. Friedl; T. W. Schlereth; J. Semmel; S. Höfling; L. Worschech; A. Forchel
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Paper Abstract

The monitoring of acetylene (C2H2) concentrations is important for many chemical processes. Industrial trace gas measurements are usually performed using gas chromatographs (GC) which have time constants of several minutes. Optical analyzers are expected to yield faster response times with lower maintenance costs. We investigated the use of quantum cascade laser (QCL) spectroscopy in the 14μm range for the sensitive and fast detection of C2H2. This spectral range is favorable, as it avoids spectral interferences by other components which could be present in typical process gases. We developed new custom DFB QCLs and characterized their spectral properties. We determined the performance of our QCL gas analyzer setup and demonstrate a noise equivalent concentration of 10 ppb in 20 s average time.

Paper Details

Date Published: 24 January 2011
PDF: 8 pages
Proc. SPIE 7945, Quantum Sensing and Nanophotonic Devices VIII, 79450J (24 January 2011); doi: 10.1117/12.873765
Show Author Affiliations
J. Herbst, Fraunhofer Institute for Physical Measurement Techniques (Germany)
B. Scherer, Fraunhofer Institute for Physical Measurement Techniques (Germany)
F. Singer, Fraunhofer Institute for Physical Measurement Techniques (Germany)
J. Erb, Fraunhofer Institute for Physical Measurement Techniques (Germany)
A. Lambrecht, Fraunhofer Institute for Physical Measurement Techniques (Germany)
C. Rathke, ABB Automation GmbH (Germany)
S. Filip, ABB Automation GmbH (Germany)
J. Kappler, ABB Automation GmbH (Germany)
P. Fuchs, Nanoplus GmbH (Germany)
J. Koeth, Nanoplus GmbH (Germany)
J. Friedl, Univ. Würzburg (Germany)
T. W. Schlereth, Univ. Würzburg (Germany)
J. Semmel, Univ. Würzburg (Germany)
S. Höfling, Univ. Würzburg (Germany)
L. Worschech, Univ. Würzburg (Germany)
A. Forchel, Univ. Würzburg (Germany)


Published in SPIE Proceedings Vol. 7945:
Quantum Sensing and Nanophotonic Devices VIII
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

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