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glossary

Isotropic light source: light source emitting with a constant intensity whichever the direction
Intensity ( radiometry ): power emitted by a light source per unit of solid angle ; same term used in photometry
Photodetector: device sensitive to light and converting the absorbed photons into a signal, in most cases into an electrical signal
Sensitivity: for a photodector, ratio between the photocurrent and the incident optical power
Photocurrent: in a photodetector, current generated by the detected light