An infrared thermometer detected the temperature difference between the hot and cold parts in the
thermoelectric generator. The LCR meter was used to measure the resistance of the thermoelectric
generator, and the measured results showed that the resistance of the generator was 8 kΩ. The
multifunction electrical meter recorded the output voltage of the thermoelectric generator. Figure 8
shows the measured results of the output voltage for the thermoelectric generator. The results depicted
that the output voltage of the thermoelectric generator was about 0.18 mV at the temperature
difference of 5 K and about 0.55 mV at the temperature difference of 15 K. The output voltage per area
of the thermoelectric generator was about 12.1 mV mm−2 K−1.