黒体光ファイバ温度計の応答に関する研究 : 第1報, ステップ応答

概要

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In order to investigate the characteristics of step response and heat transfer of an optical fiber thermometer (OFT) having a tip of a 1.27mm diameter sapphire rod sputtered with platinum, OFT heated up to 1000℃ was rapidly inserted into a potential core region of a free room-temperature air jet using pendulum motion. The time constant, the heat transfer coefficient of OFT, and the correlation of Nu=(3.07+0.529Re^<0.5>) Pr^<0.38> for Re=380-1800 were obtained. Uncertainty analysis was also carried out to support the conclusions. OFT output shows a very slow response at the quasi-steady period but a considerably quick response at the transient period. It is also made clear that the OFT response at the quasi-steady period is close to a first-order response. Very good agreement is obtained between experiment and numerical simulations, assuming one-dimensional unsteady-state heat conduction inside the sapphire rod.
社団法人日本機械学会の論文
1992-04-25