Thermopile: A thermopile is a sensitive instrument used for the detection of heat radiations and measurement of their intensity. It is based on Seebeck Effect. It is a series arrangement of similar thermocouples. If there are n thermocouples in series, the net emf in the circuit is n times the emf produced by a single thermocouple. To reduce the overall resistance, thick bars of two metals A and B are used. Since antimony-bismuth thermocouple gives quite a large thermo emf, a thermopile is formed by alternately connecting antimony and bismuth bars. The free ends of the thermopile are connected to … Continue reading Thermopile and Thermo-Electric Refrigerator