Fulltext

Open-path ozone detection by quantum-cascade laser

Taslakov, M. ; Simeonov, V. ; Froidevaux, M. ; van den Bergh, H.

In: Applied Physics B, 2006, vol. 82, no. 3, p. 501-506

Add to personal list
    Title
    • Open-path ozone detection by quantum-cascade laser
    Author
    • Taslakov, M.. Swiss Federal Institute of Technology (EPFL), Air and Soil Pollution Laboratory (LPAS), 1015, Lausanne, Switzerland
    • Simeonov, V.. Swiss Federal Institute of Technology (EPFL), Air and Soil Pollution Laboratory (LPAS), 1015, Lausanne, Switzerland
    • Froidevaux, M.. Swiss Federal Institute of Technology (EPFL), Air and Soil Pollution Laboratory (LPAS), 1015, Lausanne, Switzerland
    • van den Bergh, H.. Swiss Federal Institute of Technology (EPFL), Air and Soil Pollution Laboratory (LPAS), 1015, Lausanne, Switzerland
    Document Type
    • Postprint
    Classification
    • Physics
    OAI-PMH Identifier
    • oai:doc.rero.ch:317550
    Summary
    Open-path ozone measurements performed by mid-IR differential absorption spectroscopy are reported. Ozone spectrum was taken by fast repetitive sweeping of a quantum-cascade laser wavelength over a spectral feature from the ν3 absorption band of ozone, centered at 1031.2cm-1. Short (100ns) sweeping times were essential to prevent line-distortions caused by atmospheric turbulence. For fast wavelength sweeping, a technique that employed the thermal chirp during 140ns excitation pulses was used. The lowest detection limit of 0.3ppm.m was estimated from the minimum detectable differential absorption. We present the results from cell and open-path measurements over 440 and 5800m, together with experimental data regarding the tuning range, the tuning rate and the tuning linearity of the QCL while operated with 140ns excitation pulses