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Alignment strategy for an optomechanical image derotator using a laser Doppler vibrometer.

Bettina Altmann, Tim Betker, Christian Pape

    Applied Optics
    |September 11, 2019
    PubMed
    Summary

    This study introduces a novel method for aligning derotators using a laser Doppler vibrometer (LDV). This technique accurately measures angular deviation, enhancing the precision of measurements for rotating systems and improving machine safety and efficiency.

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    Area of Science:

    • Mechanical Engineering
    • Optical Metrology
    • Vibration Analysis

    Background:

    • Monitoring technical components during operation is crucial for safety and efficiency.
    • Derotators extend static measurement techniques to rotating systems.
    • Accurate alignment of derotators is essential for precise measurements.

    Purpose of the Study:

    • To present a novel approach for aligning derotators using a laser Doppler vibrometer (LDV).
    • To determine the angular deviation between the optical and rotational axes, which conventional methods cannot measure.
    • To enhance the overall quality of measurements obtained with derotators.

    Main Methods:

    • Utilizing a laser Doppler vibrometer (LDV) to measure angular deviation.
    • Implementing an alignment approach that leverages the LDV's existing integration with derotators.
    • Conducting experiments to validate the feasibility and analyze parameter effects.
    • Combining rotational deviation measurement with image-based translational deviation methods for full calibration.

    Main Results:

    • Demonstrated the feasibility of using LDV for determining angular deviation in derotator alignment.
    • Identified key parameters affecting alignment accuracy and established reproducible conditions.
    • Showcased that the proposed method, when combined with existing techniques, allows for complete derotator calibration.

    Conclusions:

    • The novel LDV-based approach significantly improves derotator alignment by measuring angular deviation.
    • Complete calibration of derotators is achievable by integrating this method with translational alignment techniques.
    • This enhances measurement quality and reduces calibration errors in rotating system monitoring.