Lidar Technique for Measuring Multiple Fluorescent Tracers of Atmospheric Motions

摘要

An analytical study demonstrates the feasibility of simultaneous lidar measurement and discrimination of multiple fluorescent tracers of air motions. Past work on single tracers is reviewed, and laboratory measurements of some candidates' fluorescence spectra are reported. The characteristics of fluorescent materials, lidar components, and potential interfering signals are summarized. Matrix methods are presented that can solve for the concentrations of several tracers from simultaneous measurements in at least as many spectral receiver channels, even when fluorescence spectra overlap. Two example systems, one with strong crosstalk and another without, are evaluated for accuracy in the presence of shot noise and calibration errors. Schemes for calibration are suggested. Objectives for a field demonstration of the concept are outlined. Potential applications include measuring the effect of release location on atmospheric transport and dispersion and observing the structure of complex flows.