Transmissive optical scanning of optical encoder.！

In the transmissive optical encoder, the scan system is based on the rotation of a graduated disc - or code wheel -  patterned with alternating opaque and clear (transparent) segments; the code wheel is illuminated by an infrared light source positioned perpendicularly to the sensor. The disc beams its image on the surface of several receivers, opportunely masked by another grid (called “collimator”) with the same pitch as the other. The receivers have the task to sense the variations of light that take place during the rotation of the disc, converting them into corresponding electric pulses. In linear transducers the operating principle is similar, with the difference that the motion is detected on a linear reading system.

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