PLIFによる希薄気体流の温度計測 : 吸収線の選択方法に関する考察

概要

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A method for measurement of temperature in rarefied gas flow has been developed. The flow field is visualized by planar laser-induced fluorescence (PLIF) of iodine molecules seeded in carrier gas. Iodine molecules have many absorption lines in the 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 from the ratio of the fluorescence intensities of two visualized images which are obtained by irradiations of laser beams with different wavelengths. This method allows to image the two-dimensional temperature distribution of the flow field by means of a laser sheet and a high-sensitivity CCD camera. In this paper, the method for selection of optimum combinations of two absorption lines in the transition of B(v'=43)←X(v"=0) is provided theoretically, and this is verified by means of the temperature measurement of the flow field of a supersonic free jet in which temperature varies drastically.
一般社団法人日本機械学会の論文
1992-11-25