KONICA MINOLTA

Measuring Instruments

Giving Shape to Ideas

Language of Light

2.Concepts

2.2 SPECTRORADIOMETRY

Spectroradiometry is the measurement of light energy at individual wavelengths within the electromagnetic spectrum. It can be measured over the entire spectrum or within a specific band of wavelengths.

2.2.1 SPECTRAL RADIANCE

The radiance of a light source is a single value which is the sum of all energy measured over a spectrum. The individual energy values at a particular wavelength in nanometer (nm) can be determined by a spectral radiance measurement.
The SI units for spectral radiance is Watt/square meter Steradian nanometer (Watt/m2 sr nm).

2.2.2 SPECTRAL IRRADIANCE

This is a measure of radiant flux at particular wavelength incident on per unit area.
The SI units for spectral radiance is Watt/square meter nanometer (Watt/m2 nm).

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