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A radiometer is a device used to measure the radiant flux or power in electromagnetic radiation. Although the term is perhaps most generally applied to a device which measures infrared radiation, it can also be applied to detectors operating any wavelength in the electromagnetic spectrum; a spectrum-measuring radiometer is also called a spectroradiometer.
Additional recommended knowledge
Whenever describing a radiometer, the most important characteristics are:
Radiometers can use all kinds of detectors; some are " thermal" that is absorbing energy and converting that to a signal, some sense photons (photodiode) having a constant response per quantum (light particle). In a common application, the radiation detector within a radiometer is a bolometer which absorbs the radiation falling on it and, as a result, rises in temperature. This rise can then be measured by a thermometer of some type. This temperature rise can be related to the power in the incident radiation.
The term radiometer is occasionally used as shorthand for a Crookes radiometer, a device in which a rotor with dark and light vanes in a partial vacuum spins when exposed to light.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Radiometer". A list of authors is available in Wikipedia.|