You searched for: “thermopile
thermopile
1. A thermoelectric battery, consisting usually of a series of bars of antimony and bismuth joined together, which generates a thermoelectric current when the junctions are heated; used as a thermoscope.
2. An array of thermocouples connected in parallel, having greater sensitivity than a single thermocouple; used for converting radiant energy into electrical energy, and for detecting and measuring radiant energy.