| 摘要 |
PURPOSE:To measure accurate thermal conductivity, by measuring the thermal conductivity continuously between specific measurement points in time by an unstationary hot-wire method. CONSTITUTION:When thermal conductivity is measured by an unsatationary hot-wire method, the temperature of a heating wire or its circumference is measured continuously between two points tau1 and tau2 in time after the start of power supply to the heating wire. Then, two out of many obtained measured values are processed successively as prescribed to calculate individual thermal conductivity. The mean value of the individually calculated thermal conductivity is found as the final thermal conductivity. Thus, the thermal conductivity is calculated on the basis of not only data of two points tau1 and tau2 but also many data obtained continuously between tau1-tau2, so the measurement is accurate without any influence of an error in measurement at a specifiec point in time. |
