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Spectral power distribution

A measurement that describes the power per unit area per unit wavelength of an illumination (radiant exitance).
Normspd With Eye

In radiometry, photometry, and color science, a spectral power distribution (SPD) measurement describes the power per unit area per unit wavelength of an illumination (radiant exitance). More generally, the term spectral power distribution can refer to the concentration, as a function of wavelength, of any radiometric or photometric quantity (e.g. radiant energy, radiant flux, radiant intensity, radiance, irradiance, radiant exitance, radiosity, luminance, luminous flux, luminous intensity, illuminance, luminous emittance).

Knowledge of the SPD is crucial for optical-sensor system applications. Optical properties such as transmittance, reflectivity, and absorbance as well as the sensor response are typically dependent on the incident wavelength.

Key Terms

color science
illumination
measurement
photometry
power per unit area
radiant exitance
radiometry
spd
spectral power distribution
unit wavelength

Additional Resources

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Acronymn

SPD

Synonymns

Spectral power distribution
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Sources & Credits

Last modified on April 7 2020
Content adapted from Wikipedia
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