Property measurement utilizing atomic/molecular filter-based diagnostics

摘要: A variety of atomic/molecular filter diagnostic techniques have been under development for qualitative and quantitative flow tools since their introduction in the early 1990s. This class utilizes an atomic or molecular filter, which is basically a glass cell containing selected vapor-phase species (e.g., I2, Hg, K, Rb). In filtered Rayleigh scattering (FRS), derived from it, placed front detector to modify frequency spectrum radiation scattered by flow-field constituents (i.e., molecules/atoms and/or particles) when they are illuminated narrow linewidth laser. The light transmitted through then focused on detector, typically CCD camera photomultiplier tube. can be used simply suppress background surface/particle scattering, thereby enhance visualizations, make measurements thermodynamic properties. FRS developed measure individual properties, such as velocity (when temperature molecules), multiple properties simultaneously pressure, density, temperature, velocity. manuscript summarizes needed understand techniques, gives example that develop FRS, demonstrate its capabilities, investigate fields (both non-reacting combustion) research interest utilizing unique capabilities FRS. addition, has conjunction with other diagnostics improve technique (measured PIV), concentration Raman laser-induced fluorescence). Also, brief discussion given similar being utilize filters Thomson electrons electron number density temperatures plasmas.