The working principle of optical rotary encoder！

By a center of the axis of the photoelectric encoder, which has a ring pass, dark carved lines, a photoelectric emission and receiver device to read, get four sets of sine wave signal into A, B, C, D, each sine wave Phase difference of 90 degrees (relative to a cycle of 360 degrees), the C, D signal reverse, superimposed on the A, B two-phase, can enhance the stability of the signal; another turn each output of a Z-phase pulse to represent the zero reference Bit. As A, B phase difference of 90 degrees, by comparing the A phase before or B phase in front to determine the encoder forward and reverse, through the zero pulse, the encoder can get the zero reference bit.
Encoder code of the material is glass, metal, plastic, glass plate is deposited on the glass thin line, its thermal stability, high precision, metal code directly to pass and not through the engraved line, not fragile, But because the metal has a certain thickness, there is a limit on the accuracy of its thermal stability is worse than the difference between the glass order of magnitude, plastic plate is economical, its low cost, but the accuracy, thermal stability, life are worse The
Resolution - How many pass or dark lines are provided by the encoder at 360 degrees per rotation, also known as resolution, or how many lines are called directly, typically between 5 and 10,000 lines per revolution.

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