• An instrument which measures the intensity of radiation as a function of wavelength. Such instruments usually analyze visible light, in which case they incorporate a photometer, but may also be designed to assess other intervals of the electromagnetic spectrum, such as the infrared, microwave, or X-ray regions. A spectrophotometer may be utilized to quantify absorption, emission, reflectance, transmittance, absorptance, and so on. Also called spectroradiometer.
  • synonym spectroradiometer

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