Definitions for "Bolometer"
An instrument for measuring minute quantities of radiant heat, especially in different parts of the spectrum; -- called also actinic balance, thermic balance.
A device which measures the energy of all of the radiation which falls on it, regardless of the wavelength or visibility of the radiation.
An infrared detector which absorbs the IR radiation and warms slightly; the electrical resistance across the bolometer changes as a function of temperature, which can be measured and calibrated.