Non-linear swept frequency technique for CO2 measurements using a CW laser system
arXiv:1303.4933 · doi:10.1364/AO.52.003100
Abstract
A system using a non-linear multi-swept sine wave system is described which employs a multi-channel, multi-swept orthogonal waves, to separate channels and make multiple, simultaneous online/offline CO2 measurements. An analytic expression and systematic method for determining the orthogonal frequencies for the unswept, linear swept and non-linear swept cases is presented. It is shown that one may reduce sidelobes of the autocorrelation function while preserving cross channel orthogonality, for thin cloud rejection.
22 pages, 11 figures. Submitted to Applied Optics on 03/06/2013