A Pyrometer, or radiation thermometer, is a non-contact instrument that detects an object's surface temperature by measuring the temperature of the electromagnetic radiation (infrared or visible) emitted from the object.
Typical Broadband Pyrometer
The wavelength of thermal radiation ranges from 0.1 to 100 µm (4 ~ 4,000 µin), i.e., from the deep ultraviolet (UV) across the visible spectrum to the middle of the infrared region (IR).
The Electromagnetic Radiation Spectrum
Courtesy of the Advanced Light Source, Berkeley Lab
(Ernest Orlando Lawrence Berkeley National Laboratory)
Pyrometers are essentially photodetectors which are capable of absorbing energy, or measuring the EM wave intensity, at a particular wavelength or within a certain range of wavelengths.
Common pyrometers include:
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