Incremental Measuring Systems of Optical Encoder！

The principle of the incremental measuring system is the scanning of a line pattern on a glass or plastic disc (see Image 1). The states of the line pattern transparent or not transparent are converted into electronic pulses by an opto-electronic unit (e.g. transparent = 5V, not transparent = 0V). The analysis of the signals is performed in an evaluation unit by counting up or down with each pulse. The current count is stored in digital form and is instantly available for evaluation.

However, this method has some serious disadvantages. It is possible that the result is continuously invalid due to signal glitches, unmeasured impulses or similar problems. Furthermore, after a loss of the supply voltage it is often necessary to return to a reference point which can cure complications. 
For these reasons applications with a high emphasis on precision or applications where it is complicated or not possible to return to the reference point often use the absolute measuring system.

absolute encoder, incremental encoder,

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