Which instrument is specifically designed to measure low-intensity radiant energy or heat radiation based on the thermoelectric effect?

💡 Solution & Explanation

A thermopile is an electronic device comprising multiple thermocouples connected in series to measure minute temperature variations and low-intensity radiant heat via the thermoelectric effect. Instruments like pyrometers are utilized exclusively for measuring very high temperatures from a distance through thermal radiation. Bolometers measure electromagnetic radiation incident on a surface through changes in electrical resistance.