Optical sensors can be designed passively but actively.
In the active variant is a light emitter (LED or laser diode) and a light receiver (light-sensitive resistor ( LDR), a photo-diode, a photo-transistor or a CMOS Image sensor) integrated. The receiver evaluates the intensity, the color or the duration of the received light from the light transmitter.
The passive variant consists only the light receiver, wherein a light-transmitter can also be integrated.
Optical sensors have the advantage over the other sensors such as magnetic, capacitive and inductive the advantage that they are not disturbed by ferromagnetic materials, by electric and magnetically fields.
Subcategories of Optical sensors:
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