The encoder of optical encoder！

Encoder disc with materials glass, metal, plastic, glass code discs are deposited thin engraved lines on the glass, good thermal stability, high accuracy, metal code disc directly through the barrier and engraved lines, not brittle, but because metal has a certain thickness, there are restrictions precision, thermal stability is necessary an order of magnitude worse than glass, plastic code disc is a economical, low cost, but the accuracy, thermal stability and life are to be worse.
b) Resolution
     The encoder 360 degrees per rotation number provided on or dark groove called the resolution, also known as analytic indexing, or direct say how much wire, usually 5 degrees per rpm to 10,000 lines.
c) electrical machinery speed and speed
   Mechanical speed
     Mechanical encoder speed in revolutions per minute can be the maximum number of circles represent --rpm.
   Electrical speed
     Encoder frequency electrical switching speed is also known, is to read the response speed of each pulse signal, the number of times per second expressed --Hz.

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