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.
All Science Journal Classification (ASJC) codes
- General Environmental Science
- Inorganic Chemistry
- Environmental Chemistry
- IR spectrometry
- Isotope analysis
- Nitrous oxide