Photometric and Radiometric Terms
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Photometric and Radiometric Terms
The photometric system defines light in terms of how it is perceived by the human eye. The eye’s sensitivity is dependent on the wavelength of color of the light. Peak sensitivity occurs in the green part of the visible spectrum while the eye’s response to infrared or ultraviolet is zero.The radiometric system describes light quantities in physical rather than eye response terms. The baseline detector used in the radiometric system has uniform sensitivity across the entire spectrum. Radiometric measurements can be made with thermopiles whose response does not vary with wavelength.
