Photoacoustic detection of NO2 and N2O using quantum cascade lasers
| Autor: | Helion Vargas, M. Angelmahr, Peter Hess, András Miklós, J. A. P. Lima |
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| Rok vydání: | 2006 |
| Předmět: |
Quantum optics
Materials science Physics and Astronomy (miscellaneous) business.industry General Engineering Analytical chemistry General Physics and Astronomy Nonlinear optics Laser law.invention Semiconductor laser theory Optics law Cascade Optical parametric oscillator HITRAN Quantum cascade laser business |
| Zdroj: | Applied Physics B. 85:279-284 |
| ISSN: | 1432-0649 0946-2171 |
| DOI: | 10.1007/s00340-006-2357-0 |
| Popis: | Pulsed quantum cascade lasers (QCLs) with 6.2-μm and 8-μm wavelengths and a differential photoacoustic (PA) detector were used to measure concentrations of NO2 and N2O in the sub-ppmv range at ambient pressure. The QCL temperatures were tuned between -40 °C and 30 °C. Good agreement was found between measured PA vibrational spectra and simulated HITRAN spectra of both nitrogen oxides. The PA signals showed a linear dependence on the concentration in the investigated 0.5–50 ppmv region in both cases. The results for N2O are compared with a PA measurement of N2O at 2.9 μm using a grazing-incidence optical parametric oscillator. |
| Databáze: | OpenAIRE |
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