2. Radiometric and photometric quantities
2.1 Flow
Flux Φ is the instantaneous value of a radiation flow. It may be all the radiation emitted by a source, or only that carried by the beam leaving an instrument, or even that received by a detector.
Flux can be measured by the power (in watts: system of energy units) it carries, or by the number of photons it delivers per unit of time (in s –1 : system of photon units).
2.2 Geometric extent
Consider a source surface...
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Radiometric and photometric quantities
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