The working principle of optical rotary encoders！

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.

absolute encoder, incremental encoder,photoelectric encoder, hybrid encoder,

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