Thermopile

It is very sensitive instrument used to detect the presence of heat radiation. In consists of a number of thermocouples, usually of antimony and bismuth, joined in series. Each thermocouple produces some electromotive force. So such an arrangement of thermocouples joined in series helps to multiply the total emf produced in the circuit. The two ends of the thermopile are connected to a sensitive galvanometer. The junctions on one side are coated with lampblack and are exposed to heat radiations. The junctions on the other side are kept cold. The deflection in the galvanometer measures the intensity of heat radiations and the scale can be calibrated.


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