Noun
An instrument of extreme sensibility, used to determine slight differences and degrees of heat. It is composed of alternate bars of antimony and bismuth, or any two metals having different capacities for the conduction of heat, connected with an astatic galvanometer, which is very sensibly affected by the electric current induced in the system of bars when exposed even to the feeblest degrees of heat.
Source: Webster's dictionaryHere, a larger voltage is needed than in a pilot flame safety system described above, and a thermopile is used rather than a single thermocouple. Source: Internet
It is possible to measure radiative intensities of only a few μW/cm 2 with commercially available thermopile sensors. Source: Internet