bolometric

bo·lom·e·ter   (bō-lŏm'ĭ-tər)    n.  An instrument that measures radiant energy by correlating the radiation-induced change in electrical resistance of a blackened metal foil with the amount of radiation absorbed. [Greek bolē, ray; see gwelə- in Indo-European roots + -meter.] bo'lo·met'ric (bō'lə-mět'rĭk) adj., bo'lo·met'ri·cal·ly adv.

Main Entry: bo·lom·e·ter
Pronunciation: bO-'läm-&t-&r
Function: noun
: a very sensitive thermometer used in the detectionand measurement of feeble thermal radiation and especially adapted to the study of infrared spectra —bo·lo·met·ric /"bO-l&-'me-trik/ adjective —bo·lo·met·ri·cal·ly /-tri-k(&-)lE/ adverb