We report the development of a novel laser spectrometer for high-sensitivity detection of methane and nitrous oxide. The system relies on a quantum-cascade laser source emitting wavelength of around 8.06 μm, where strong fundamental absorption bands occur for the considered species and their isotopomers. The detection technique is based on audio-frequency and radio-frequency modulation of laser radiation. First experimental tests have been performed to estimate the achievable detection limits and the signal reproducibility levels in view of possible measurements of 13C/12C, 18O/16O, 17O/16O and 15N/14N isotope ratios.
G. Gagliardi, S. Borri, F. Tamassia, F. Capasso, C. Gmachl, D. L. Sivco, et al. (2005). A frequency-modulated quantum-cascade laser for spectroscopy of CH4 and N2O isotopomers. ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES, 41, 313-321 [10.1080/10256010500384572].
A frequency-modulated quantum-cascade laser for spectroscopy of CH4 and N2O isotopomers
TAMASSIA, FILIPPO;
2005
Abstract
We report the development of a novel laser spectrometer for high-sensitivity detection of methane and nitrous oxide. The system relies on a quantum-cascade laser source emitting wavelength of around 8.06 μm, where strong fundamental absorption bands occur for the considered species and their isotopomers. The detection technique is based on audio-frequency and radio-frequency modulation of laser radiation. First experimental tests have been performed to estimate the achievable detection limits and the signal reproducibility levels in view of possible measurements of 13C/12C, 18O/16O, 17O/16O and 15N/14N isotope ratios.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
