純回転CARSによる温度計測に関する研究 : 希薄気体流への応用

概要

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In pure rotational CARS (Coherent Anti-Stokes Raman Scattering) through multiple four-color interaction, the rotational energies are excited with two photons of different frequencies from a broadband dye laser. We apply this technique to measurement of temperature in nitrogen supersonic free jets. This method can measure low temperature easier and more accurately than Q-branch vibrational CARS, because rotational lines of pure rotational CARS are separated enough so that they are not affected by pressure. The number densities just behind the nozzle exit are higher than the least number density (5.6×10^<23> m^<-3>) required for temperature determination at room temperature with our apparatus. Therefore, the measured temperatures are in good agreement with the theoretical values under the assumption of isentropic expansion at that region.
社団法人日本機械学会の論文
1994-03-25