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Development of a design tool for closed-loop digital vibrometer.

Dario Melchionni, Alessandro Magnani, Alessandro Pesatori

    Applied Optics
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    Summary
    This summary is machine-generated.

    A closed-loop technique enhances vibrometer performance using self-mixing interferometry. This digital approach improves linearity and stability, validated by FPGA prototype testing.

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    Area of Science:

    • Optics and Photonics
    • Instrumentation and Measurement
    • Control Systems Engineering

    Background:

    • Self-mixing interferometry (SMI) is a technique for measuring displacement and velocity.
    • Traditional SMI vibrometers face limitations in linearity and dynamic range.
    • Closed-loop control offers potential for enhanced SMI system performance.

    Purpose of the Study:

    • To investigate the application of a closed-loop technique for designing a vibrometer based on self-mixing interferometry.
    • To analyze the electronic feedback loop for improved linearity, stability, and extended range.
    • To digitally implement and validate the closed-loop vibrometer design.

    Main Methods:

    • Simulation of the closed-loop vibrometer system.
    • Deep analysis of the electronic feedback loop dynamics.
    • Implementation of a digital control approach on a Field-Programmable Gate Array (FPGA) based prototype.

    Main Results:

    • Demonstration of the closed-loop technique as a viable configuration for SMI vibrometers.
    • Achieved improvements in linearity and extended linearity range compared to open-loop systems.
    • Successful validation of the digital closed-loop approach through FPGA prototype performance.

    Conclusions:

    • The closed-loop technique significantly enhances the performance of self-mixing interferometry vibrometers.
    • Digital implementation on an FPGA provides a stable and high-performance solution.
    • This approach offers a promising path for advanced optical measurement instruments.