液体の熱伝導率の光学的非定常測定法の研究

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The results obtained from the present project are summerized as follows.[1984]1. An apparatus to measure the thermal diffusivity of liquids by the forced Rayleigh scattering method was constructed and the principle of the method was confirmed.2. The error factors(sample thickness, wall thickness, dye concentration) were experimentally investigated through the measurements on toluene.[1985]1. In order to improve the accuracy of the measurement, the follwing modifications were made.(1) on-line data acquisition, (2) measurement of the fringe spacing by CCD device,(3) extension of the heating duration time.2. Measurements of several liquids at room temperature were performed. (1) organic liquids (toluene, hexane, heptane and methanol), (2) water, (3) liquid crystal.[1986]1. The error factors were theoretically analysed and compared with the experimental results. The error factors considered were ; (1) sample thickness, (2) dye concentration, (3) Gaussian intensity distribution of the heating beam, (4) heating duration time.2. The apparatus was improved to measure the high temperature molten salts.3. Measurements were performed on molten <NaNO_3> and KCl in the temperature range up to about 1000゜C.