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Versatile multipass cell for laser spectroscopic trace gas analysis

Manninen, A. ; Tuzson, B. ; Looser, H. ; Bonetti, Y. ; Emmenegger, L.

In: Applied Physics B, 2012, vol. 109, no. 3, p. 461-466

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    Titre
    • Versatile multipass cell for laser spectroscopic trace gas analysis
    Auteur
    • Manninen, A.. Laboratory for Air Pollution & Environmental Technology, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600, Dübendorf, Switzerland
    • Tuzson, B.. Laboratory for Air Pollution & Environmental Technology, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600, Dübendorf, Switzerland
    • Looser, H.. Institute for Aerosol and Sensor Technology, FHNW, University of Applied Sciences, Steinackerstrasse 5, 5210, Windisch, Switzerland
    • Bonetti, Y.. Department of Physics, Institute for Quantum Electronics, ETH Zürich, Swiss Federal Institute of Technology, Wolfgang-Pauli-Strasse 16, 8093, Zürich, Switzerland
    • Emmenegger, L.. Laboratory for Air Pollution & Environmental Technology, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600, Dübendorf, Switzerland
    Type de document
    • Postprint
    Classification
    • Physique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:320081
    Summary
    The design, construction and characterization of a novel circular multipass cell for sensitive trace gas analysis are presented. This cell allows for easy modification of the optical path length without any changes of its physical parameters. Furthermore, it is suited for three different detection techniques: direct absorption, wavelength modulation and photoacoustics. To demonstrate its performance, mixing ratios of 13CO2 and N2O were measured from ambient air, using a quantum cascade laser. With the direct absorption method, noise equivalent 1-s precisions of 2.7ppb and 0.2ppb are achieved for 13CO2 and N2O, respectively. The wavelength modulation technique resulted in 4.3ppb precision with 1-s averaging for the 13CO2 measurements. AQ-factor of 190 and a normalized noise equivalent minimum absorption of 1.3×10−8cm−1 W Hz−1/2 are achieved using the photoacoustic technique