A thermopile or a thermoelectric pile is a device that converts thermal energy into electrical energy. It is composed of several thermocouples connected usually in series or, less commonly, in paralle
Picture of a heat flux sensor that utilizes a thermopile to measure heat flux. Model shown is the FluxTeq PHFS-01. The output is passively induced and proportional to the thermopile's temperature difference and number of thermocouples it consists of in series.