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High-resolution optical position encoder with large mounting tolerances.

K Engelhardt, P Seitz

    Applied Optics
    |May 1, 1997
    PubMed
    Summary
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    A novel optical position encoder uses a segmented phase detector for high accuracy. This design allows for larger mechanical tolerances, improving linear and rotary encoder applications.

    Area of Science:

    • * Optical metrology and sensor technology.
    • * Integrated circuit design for precision measurement.

    Background:

    • * Standard moiré-based systems often require precise alignment.
    • * Existing high-resolution encoders can be sensitive to mechanical tolerances.

    Purpose of the Study:

    • * To present a novel high-resolution optical position encoder design.
    • * To demonstrate improved mechanical tolerances without sacrificing accuracy.
    • * To explore applications in linear and rotary encoding.

    Main Methods:

    • * Integration of a scale, stabilized imaging system, and a segmented phase detector integrated circuit.
    • * Utilizing a standard moiré-based system scale.
    • * Development of a novel segmented phase detector IC.

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    Main Results:

    • * Achieved interpolation accuracy better than 0.1 micrometers.
    • * Demonstrated significantly larger mechanical tolerances for reading head alignment compared to similar systems.
    • * Preserved high accuracy despite increased tolerance.

    Conclusions:

    • * The developed optical encoder offers superior mechanical flexibility.
    • * Suitable for cost-effective, compact, high-resolution rotary encoders.
    • * Ideal for high-resolution linear encoder applications requiring robustness.