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1. Sources and detectors: general information
To build an optical sensor, we always find the same elements:
a light source ;
a light detector ;
focusing optics.
1.1 Light source
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The light source may be natural (daylighting), but is often artificial. In the past, incandescent lamps were widely used. In many cases, they are now preferred to light-emitting diodes (LEDs) and laser diodes, due to their size, cost and low power consumption. Laser tubes are reserved for complex, high-end systems requiring either high optical power or high metrological quality of the light beams emitted. On the other hand, they take up much more space.
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Sources and detectors: general information
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