title: Nonlinear swept frequency technique for CO2 measurements using a CW laser system.
abstract: A system using a nonlinear multiswept sine wave is described, which employs multichannel multiswept orthogonal waves, to separate channels and make multiple, simultaneous online/offline CO(2) measurements. An analytic expression and systematic method for determining the orthogonal frequencies for the unswept, linear swept, and nonlinear 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.
authors.affiliation: NASA Langley Research Center Hampton, Virginia 23681, USA. joel.f.campbell@nasa.gov
authors.forename: Joel F
authors.initials: JF
authors.lastname: Campbell