Differential Temperature Controller for the Measurement of Thermoelectric Power on Small Samples

摘要

A low cost simple and versatile Seebeck coefficient 'S' measurement setup is fabricated. The fabricated setup can measure values of Seebeck coefficient 'S' with variation in temperature. The temperature can be varied from 25℃ to 300℃. The setup can measure the value of S in the said temperature range for small samples. The compact setup has two heaters to raise overall temperature of the sample from 25℃ to 300℃. The auxiliary heaters maintain the temperature gradient. The set overall sample temperature and temperature gradient is maintained by controller circuit and other ancillary circuits. To reduce error in Seebeck measurements, the temperature gradient AT can be varied from 1 to ± 10℃. The measured Seebeck coefficient 'S' variation with temperature for four single crystal samples using the fabricated setup is presented.