caa a22 4500 465755615 CHVBK 20180323111846.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF01184333 doi (NATIONALLICENCE)springer-10.1007/BF01184333 Thermal conductivity by a pulse-heating method: Theory and experimental apparatus [Elektronische Daten] [F. Righini, G. Bussolino, A. Rosso, R. Roberts] A new dynamic technique for the measurement of thermal conductivity at high temperatures has been developed at the IMGC. The specimen is brought to high temperatures with a current pulse; during cooling the heat content is dissipated by radiation and by conduction. The differential equation describing this process contains terms related to the heat capacity, the hemispherical total emittance, and the thermal conductivity of the material. If the first two properties are determined using the same specimen during subsecond pulse heating experiments, thermal conductivity may be evaluated by accurate measurements of the round-shaped temperature profiles established on the specimen during cooling. High-speed scanning pyrometry makes possible accurate measurements of temperatures and of temperature derivatives (with respect to space and time), which enables the differential equation describing the power balance at each point of the specimen to be transformed into a linear equation of the unknown thermal conductivity. A large overdetermined system of linear equations is solved by least-squares techniques to obtain thermal conductivity as a function of temperature. The theory underlying the technique is outlined, the experimental apparatus is described, and details of the measurement technique are given. Plenum Publishing Corporation, 1990 dynamic measurements nationallicence high temperature nationallicence scanning pyrometry nationallicence thermal conductivity nationallicence Righini F. CNR Istituto di Metrologia "G. Colonnetti,”, Strada delle Cacce 73, 10135, Torino, Italy aut Bussolino G. CNR Istituto di Metrologia "G. Colonnetti,”, Strada delle Cacce 73, 10135, Torino, Italy aut Rosso A. CNR Istituto di Metrologia "G. Colonnetti,”, Strada delle Cacce 73, 10135, Torino, Italy aut Roberts R. CNR Istituto di Metrologia "G. Colonnetti,”, Strada delle Cacce 73, 10135, Torino, Italy aut International Journal of Thermophysics Kluwer Academic Publishers-Plenum Publishers 11/4(1990-07-01), 629-641 0195-928X 11:4<629 1990 11 10765 https://doi.org/10.1007/BF01184333 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01184333 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Righini F. CNR Istituto di Metrologia "G. Colonnetti,”, Strada delle Cacce 73, 10135, Torino, Italy aut NATIONALLICENCE 700 1- Bussolino G. CNR Istituto di Metrologia "G. Colonnetti,”, Strada delle Cacce 73, 10135, Torino, Italy aut NATIONALLICENCE 700 1- Rosso A. CNR Istituto di Metrologia "G. Colonnetti,”, Strada delle Cacce 73, 10135, Torino, Italy aut NATIONALLICENCE 700 1- Roberts R. CNR Istituto di Metrologia "G. Colonnetti,”, Strada delle Cacce 73, 10135, Torino, Italy aut NATIONALLICENCE 773 0- International Journal of Thermophysics Kluwer Academic Publishers-Plenum Publishers 11/4(1990-07-01), 629-641 0195-928X 11:4<629 1990 11 10765 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer