| 摘要 |
PROBLEM TO BE SOLVED: To enable the temp. change of a sample in a state keeping the temp. difference between both ends of the sample constant and accurate, by setting the temp. difference itself between both ends of the sample to a feedback control as an object to be controlled when the thermal electromotive force of a thermoe lectric material is measured. SOLUTION: Both ends of a sample 50 composed of a thermoelectric material are respectively heated by exclusive infrared lamps 56, 58. The temps. Ta, Tb of both ends of the sample 50 are measured by thermocouples 64, 66. A signal is outputted to a firs heating power supply 72 in a first temp. control unit 70 so that the upper end temp. Ta follows a predetermined temp. rising curve and the temp. differenceΔT between the upper and lower temps. Ta, Tb is sent to a second temp. control unit 78, and the signal is outputted to a second heating power supply 80 so that the temp. differenceΔT is held to a predetermined constant value. By this constitution, the lower end temp. Tb follows so as to always hold the constant temp. differenceΔT with respect to the upper end temp. Ta. The thermal electromotive force generated between both ends of the sample 50 is detected by a voltmeter 28.
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