| 摘要 |
PROBLEM TO BE SOLVED: To provide a substance terminal diffusivity measurement method which can exactly and quickly measure a thermal diffusivity α without being constricted in a shape of a measured substance, and a thermoelectric characteristic evaluation device.SOLUTION: Temperature vibration 21 which vibrates at an angular frequency ω is imparted to one end part of a thermoelectric conversion element 1 at a distance L, a phase of a first electric signal of a thermo-electromotive force Vα(L) which is generated at one end part by a Seebeck effect resulting from the temperature vibration 21 imparted to one end part is measured by a lock-in amplifier 11, and a phase of a second electric signal of a thermo-electromotive force Vα(x) which is generated at a first measurement point which is apart from the other end part of the thermoelectric conversion element 1 by a distance x is measured by a lock-in amplifier 12. A phase delay &thetas; of the temperature vibration 21 which is transmitted to the first measurement point from the one end part is obtained as a phase difference &thetas; of each electric signal. On the basis of a correlation relationship of a formula (15) between the length L, the angular frequency ω, the distance x, the phase difference &thetas; and the thermal diffusivity α of the measured substance, the thermal diffusivity α is calculated by using the same thermoelectric conversion element 1 as well as a Seebeck coefficient S and an electric resistance &rgr;.SELECTED DRAWING: Figure 2 |
