Optical incremental encoder and attention using encoder！

Incremental encoder problem:
1) the presence of incremental encoder zero cumulative error, poor immunity, the receiving device downtime required power and memory, power should give change or reference position and other issues, such as the selection of these problems can be solved absolute encoder.
2) measuring the speed of time and other methods, the number of pulses and the like method.
     And other time method, select a unit of time (such as 100mS), the number of pulses per unit time accumulated time read an average of both the average rate over this time period.
     And other pulses, a certain number of selected pulse number (such as 100 pulses), the cumulative number of times to read these pulses, the average time for both the average speed of this time.
     General industry multipurpose isochronous method.

Note the use of optical encoders
1, the mechanical part
     1) measuring the length or angle measurement;
     2) shaft installation form;
     3) use of the environment, dust, moisture, vibration, shock.
2, the electrical part
     1) connected to the output of the receiving section;
     2) signal form;
     3) resolution requirements;
     4) control requirements.

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