Thermopile is the term used to describe a multiple-junction thermocouple circuit that is designed to
amplify the output of the circuit. Because thermocouple voltage outputs are typically in the millivolt
range, increasing the voltage output may be a key element in reducing the uncertainty in the
temperature measurement, or may be necessary to allow transmission of the thermocouple signal to
the recording device. Figure 8.22 shows a thermopile for providing an amplified output signal; in
this case the output voltage would be N times the single thermocouple output, where N is the number
of measuring junctions in the circuit. The average output voltage corresponds to the average