DESIGN AND IMPLEMENTATION OF SEEBECK EFFECT EXPERIMENTAL INSTRUMENT BASED ON OPTICAL RADIATION

In this work, the Seebeck effect of the alloy is measured on different thermal media using a high-power laser as the heat source and a thin film thermopile as the conversion unit. The core sensor of the experimental device has a silicon layer for light absorption, a substrate for heat conduction, and an alloy thermoelectric pile for thermoelectric conversion, featuring a compact structure and high signal-to-noise ratio. The temperature and voltage signal and the Seebeck coefficient of thermopile are real-time visualized by the program coded by LABVIEW. The program displays the different thermal and electrical signals in time dimension to compare the thermal conductivity of different substrates. The linear relationship between power and voltage can be verified by measuring the steady state electrical signals corresponding to different power lasers. Therefore, this instrument can be used to measure laser power. This experimental instrument is simple, easy to operate and the measurements are accurate. Students can not only operate, but also learn the relevant theories of thermoelectricity and laser power measurement technology through data processing.