LIF法による可視化画像を用いた希薄気体流の温度計測法の開発 : 波長の異なる二つのレーザ光を用いた温度計測

概要

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We have developed a method of local temperature measurement in the rarefied gas flow using laser-induced fluorescence of iodine molecules seeded in carrier gas. lodine molecules have many absorption lines in visible region and radiate intense fluorescence. The fluorescence intensity is proportional to the number of molecules in the energy level excited by the laser beam. From the dependence of this number on the temperature, the local temperature can be decided through the ratio between the fluorescence intensities of two visualized images which are obtained by irradiations of laser beams with different wave length. This method allows to measure the temperature distribution of the entire flow field instantaneously by means of a laser sheet and a high sensitive vidicon camera. This method is applied to the local temperature measurement of the flow field of a supersonic free jet in which temperature varies drastically. It is found that the temperature distribution along the centerline of the jet measured by P26R28 and P16R18 absorption lines agrees well with the theoretical one.
社団法人日本機械学会の論文
1990-09-25