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glossary

Lambertian light source: light source with a constant radiance (or luminance) whichever the direction
Radiance ( radiometry ): for a light source or a diffusing/reflecting surface, power emitted per unit of solid angle and per unit of apparent area
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