Examples from the Web for thermopile
So far as I know, this is the first application of the thermopile to variables.
Helmholtz takes the case of a circuit of resistance R in which acts an electromotive force due to a battery or thermopile.
The principle of the thermopile we need not describe in detail.Colour Measurement and Mixture|W. de W. Abney
Change or apparent change in intensity; observed by energy received by thermopile.The Ether of Space|Oliver Lodge
The heat of a match, or the cold of a piece of ice, will produce a current, even if held at some distance from the thermopile.Things a Boy Should Know About Electricity|Thomas M. (Thomas Matthew) St. John