論文 - 長坂　雄次

Theory and Experiment of the Soret Forced Rayleigh Scattering Technique for Mass Diffusion Coefficient Measurement of Binary Liquid Mixtures

Matsuura H., Nagasaka Y.

International Journal of Thermophysics 45 （ 8 ）  2024年08月

ISSN  0195928X

　概要を見る

Mass diffusion coefficient measurement techniques with high temporal and spatial resolution have become essential for the research and development of leading-edge technology in a wide range of cross-disciplinary fields, but cannot be achieved using conventional methods. We provide a comprehensive review of the state-of-the-art theoretical and experimental investigations on Soret forced Rayleigh scattering (SFRS), a grating excitation technique (GET) for measuring the mass diffusion coefficient of binary liquid mixtures. SFRS utilizes the Soret effect to create micrometer-order periodic spatial concentration modulation in a sample due to the absorption of an optical interference grating generated by two intersecting heating laser beams. The decay of the concentration modulation by the mass diffusion process within several milliseconds is detected by the diffraction of a probing beam. The theoretical considerations regarding deviations from the ideal mass diffusion conditions are the effects of: (1) the Gaussian beam intensity distribution, (2) the light absorbing material and (3) the cell wall. The proper settings for the optical system are also analyzed, e.g., the effect of coherency and polarization of the heating laser and the effect of the z-direction length of the interference region. We also consider the frame of reference, center of gravity invariance and effect of convection, which are particularly important for mass diffusion experiments. Using the correct implementation of the theory, the optimal SFRS apparatus design and its appropriate use are described in detail. Finally, two successful applications of SFRS are demonstrated using visible light laser heating and mid-wavelength infrared gas laser heating.

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Advanced Passive Thermal Control Materials and Devices for Spacecraft: A Review

Tachikawa S., Nagano H., Ohnishi A., Nagasaka Y.

International Journal of Thermophysics 43 （ 6 ）  2022年06月

ISSN  0195928X

　概要を見る

In recent planetary exploration space missions, spacecraft are exposed to severe thermal environments that are sometimes more extreme than those experienced in earth orbits. The development of advanced thermal control materials and devices together with reliable and accurate measurements of their thermophysical properties are needed for the development of systems designed to meet the engineering challenges associated with these space missions. We provide a comprehensive review of the state-of-the-art advanced passive thermal control materials and devices that are available for space applications, specifically, variable emissivity thermal control materials and microelectromechanical systems (MEMS), radiofrequency (RF)-transparent and/or tunable solar absorptivity and total hemispherical emissivity thermal control materials, and a passive re-deployable radiator with advanced materials and insulation. Prior to our in-depth review of these thermal control materials, we briefly summarize the thermal environments surrounding spacecraft, the characteristics of thermophysical properties for spacecraft materials that differ from those of materials for ground use, and the significance of solar absorptivity and total hemispherical emissivity for passive thermal control in space. In all four topics of materials and devices, the following subjects are overviewed: the basic principle of passive thermal control techniques in space, the measurement of thermophysical properties of those novel materials, simulation and/or on-orbit verification thermal performance tests, degradation tests in space environments, and some aspects of the implementation of the above-described materials and devices in actual space missions.

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Rapid and label-free sensing of intermolecular interactions using compact optical diffusion sensor

Kamata, M., Takaba, Y., Taguchi. Y. and Nagasaka, Y.

International Journal of Heat and Mass Transfer 133   73 - 79 2019年04月

研究論文（学術雑誌）

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Non-contact optical hand-held viscosity sensor with incident angle and irradiation timing controls

Eguchi, M., Taguchi, Y. and Nagasakam Y.

Optics Express 26 （ 26 ） 34070 - 34080 2018年12月

研究論文（学術雑誌）

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低濃度グルコース水溶液の非接触濃度センシング手法に関する研究 ―2波長回転位相子法による微小旋光度検出装置の開発―

老川 ひろみ，長坂 雄次

熱物性 32 （ 4 ）  2018年11月

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新しい補正法による真空下における低熱伝導率材料の熱伝導率測定

冨岡 孝太，大関 駿太郎，太刀川 純孝，大村 高弘，長坂 雄次

熱物性 32 （ 3 ） 104 - 111 2018年07月

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Design of an Optofluidic Diffusion Sensor by Transient Grating using Dielectrophoresis

KAMATA MAKOTO, TAGUCHI YOSHIHIRO, NAGASAKA YUJI

Optics Express 26 （ 13 ） 16970 - 16983 2018年06月

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Development of Measurement Technique of Mass Diffusion Coefficient of Aqueous Methanol Solutions in Polymer Electrolyte Membranes Based on Infrared Soret Forced Rayleigh Scattering Method using Single Crystal Diamond Window in a Sample Cell

MATSUURA HIROAKI, TOKUDA DAICHI, NAGASAKA YUJI

Journal of Thermal Science and Technology 13 （ 1 ） 1 - 12 2018年05月

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簡易・迅速なin situ測定を実現する光学式ハンドヘルド粘性センサの開発

江口 雅人，田口 良広，長坂 雄次

日本機械学会論文集 84 （ 860 ） 17 - 29 2018年04月

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Soret forced Rayleigh scattering instrument for simultaneous detection of two- wavelength signals to measure Soret coefficient and thermodiffusion coefficient in ternary mixtures

MATSUURA HIROAKI, NAGASAKA YUJI

Review of Scientific Instruments 89, 024903   1 - 12 2018年02月

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2017年日本熱物性学会賞の授賞と名誉員の顕彰についての報告

長坂 雄次

熱物誌 32 （ 1 ） 2 - 3 2018年02月

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Decay Time Control of Mass Diffusion in a Transient Grating using a Fringe-tunable Electrothermal Fresnel Mirror

KIUCHI YUKI, TAGUCHI YOSHIHIRO, NAGASAKA YUJI

Journal of Thermal Science and Technology 12 （ 2 ） 17-00301/1 - 11 2017年09月

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Measurement of Out-of-Plane Thermal Conductivity of Epitaxial YBa2Cu3O7-δ Thin Films in the Temperature Range from 10 K to 300 K by Photothermal Reflectance

MURAKAMI YUSUKE, GOTO HARUNA, TAGUCHI YOSHIHIRO, NAGASAKA YUJI

Int. J. Thermophys 38:160   1 - 22 2017年09月

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平成28 年度日本伝熱学会賞選考の報告

長坂 雄次

伝熱 56(236)   3 - 4 2017年07月

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Editorial Preface

長坂 雄次

Fluid Phase Equilibria (ATPC2016 Special Issue) 441   1 2017年06月

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2波長観察用レーザーを利用したソーレー強制レイリー散乱法による3成分系のソーレー係数・熱拡散係数測定法の開発

松浦 弘明，長坂 雄次

熱物性 31 （ 2 ） 89 - 96 2017年05月

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2016年日本熱物性学会賞の授賞と名誉員の顕彰についての報告

長坂 雄次

熱物誌 31 （ 1 ） 2 - 3 2017年02月

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Fringe-tunable electrothermal Fresnel mirror for use in compact and high-speed diffusion sensor

木内 祐樹，田口 良広，長坂 雄次

Optics EXPRESS 25 （ 2 ） 758 - 767 2017年01月

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Nanoscale optical thermometry using a time-correlated single-photon counting in an illumination-collection mode

瀬戸 大地，日守 錬，西尾 昌吾，田口 良広，斎木 敏治，長坂 雄次

Appl. Phys. Lett. （American Institute of Physics）  110 （ 3 ） 0 - 4 2017年01月

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スバッタ成膜a-Si:Hを用いたレーザー誘起誘電泳動による光MEMS拡散センサーの開発

鎌田 慎，山田 幹，田口 良広，長坂 雄次

熱物性 30 （ 2 ） 74 - 79 2016年05月

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