A spectrometer, based on the frequency down-chirped radiation from a pulsed quantum-cascade laser, capable of detecting fluctuations in local ground level methane and nitrous oxide concentrations over a time scale of minutes, is presented. The applicability of this instrument to low-level atmospheric detection is demonstrated through sampling gases in two locations.
- applied physics
Langford, N., Duxbury, G., & Wright, S. (2006). A compact quantum-cascade laser based spectrometer for monitoring the concentrations of methane and nitrous oxide in the troposphere. Applied Physics B: Lasers and Optics, 85(2-3), 243-249. https://doi.org/10.1007/s00340-006-2384-x