The spectral power distribution over the visible spectrum from a source can have varying concentrations of relative SPDs. Source SPD and matter Figure showing the greater proportion of blue light scattered by the atmosphere relative to red light. Knowing the responsitivity is beneficial for determination of illumination, interactive material components, and optical components to optimize performance of a system's design. Mathematically, for the spectral power distribution of a radiant exitance or irradiance one may write: Optical properties such as transmittance, reflectivity, and absorbance as well as the sensor response are typically dependent on the incident wavelength. Knowledge of the SPD is crucial for optical-sensor system applications. radiant energy, radiant flux, radiant intensity, radiance, irradiance, radiant exitance, radiosity, luminance, luminous flux, luminous intensity, illuminance, luminous emittance). 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. 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). CIE standard illuminant spectral power distribution comparisons referenced to the human visual system photopic response For the statistics and signal processing concept, see Power spectral density.
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