radiometer

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ra·di·om·e·ter / ˌrādēˈämitər/ • n. an instrument for detecting or measuring the intensity or force of radiation. DERIVATIVES: ra·di·o·met·ric / -dēəˈmetrik/ adj. ra·di·o·met·ri·cal·ly / -dēəˈmetrik(ə)lē/ adv. ra·di·om·e·try / -trē/ n.

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radiometer An instrument to measure radiation, but usually a device to monitor infrared radiation. It can be precisely tuned for specific frequencies, but usually has poor spatial resolution.