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Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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High precision dynamic measurement method for axial clearance based on time division multiplexing with dispersive

Fajie Duan, Xiuming Li, Ruijia Bao

    Optics Express
    |September 15, 2023
    PubMed
    Summary

    A new method accurately measures dynamic rotor-stator axial clearance in high-speed machinery using time division multiplexing and frequency domain interferometry. This technique enhances rotating machine efficiency and safety with proven precision.

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    Area of Science:

    • Mechanical Engineering
    • Optical Metrology

    Background:

    • Rotor-stator axial clearance is critical for rotating machinery performance and safety.
    • Accurate measurement of dynamic clearance is challenging in high-speed applications.

    Purpose of the Study:

    • To develop and validate a precise method for measuring dynamic axial clearance in high-speed rotating machinery.
    • To improve the efficiency and safety of rotating machines through accurate clearance monitoring.

    Main Methods:

    • Proposed a method combining time division multiplexing (TDM) with frequency domain interferometry.
    • Integrated an optical switch for dispersive interferometry (DPI) and TDM across multiple light source channels.

    Main Results:

    • Achieved a static accuracy of 1.5 µm over a 15 mm range.
    • Demonstrated a dynamic accuracy of 9 µm at 3000 rpm.
    • Validated the method's robustness and accuracy through simulations and experiments.

    Conclusions:

    • The proposed TDM-based frequency domain interferometry method offers a robust and accurate solution for dynamic axial clearance measurement.
    • This technique is suitable for high-speed rotating machinery, contributing to enhanced operational efficiency and safety.