Transcription of Radiometry and Photometry
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Radiometry and Photometry Wei-Chih WangDepartment of Power Mechanical EngineeringNational TsingHua UniversityW. WangMaterials Covered Radiometry - Radiant Flux- Radiant Intensity- Irradiance- Radiance Photometry - luminous Flux- luminous Intensity - Illuminance- luminance Conversion from radiometric and photometric W. Wang3 Radiometry is the detection and measurement of light waves in the optical portion of the electromagnetic spectrum which is further divided into ultraviolet, visible, and infrared of a typical radiometerW. Wang4 All light measurement is considered Radiometry with Photometry being a special subset of Radiometry weighted for a typical human eye of a typical photometerW. Wang5 Figure shows a schematic illustration of the human eye (Encyclopedia Britannica, 1994).The inside of the eyeball is clad by the retina, which is the light-sensitive part of the eye.
watt, E( ) is the spectral power in watts per nanometer, and V( ) is the photopic spectral luminous efficiency function. Note that the integration is only carried out over the wavelengths for which V( ) is non-zero (i.e. = 380 -830nm). Since V( ) is given by a table of empirical values, it is best to do the integration numerically. W. Wang
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