Noun
An instrument for measuring minute quantities of radiant heat, especially in different parts of the spectrum; -- called also actinic balance, thermic balance.
Source: Webster's dictionaryA bolometer is the instrument used to measure radiant energy over a wide band by absorption and measurement of heating. Source: Internet
Planck employs both HEMT radiometers and bolometer technology and will measure the CMB at a smaller scale than WMAP. Source: Internet
The radiant energy of the incident beam was deduced from its heating effect upon a small blackened silver disk, which was found to be more reliable than the bolometer when it was first used. Source: Internet
For longer wavelength observations or higher sensitivity other detectors may be used, including other narrow gap semiconductor detectors, low temperature bolometer arrays or photon-counting Superconducting Tunnel Junction arrays. Source: Internet