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High-performance optical coherence velocimeter: theory and applications.

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    This study introduces a high-performance optical coherence velocimeter (OCV) that overcomes blurring issues for accurate high-velocity measurements. The developed OCV achieves nanometer-level precision for applications in vibration monitoring and acoustic measurement.

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    Area of Science:

    • Optical Metrology
    • Velocimetry
    • Interferometry

    Background:

    • Optical coherence velocimetry (OCV) faces challenges with blurred interference fringes at high velocities.
    • This limitation hinders OCV's application in high-velocity measurement fields.

    Purpose of the Study:

    • To resolve the blurring issue in OCV for high-velocity measurements.
    • To derive the relationship between the blurry coefficient and OCV system parameters.
    • To enhance the measurable velocity range of OCV systems.

    Main Methods:

    • Developed a high-performance OCV based on broadband optical interference.
    • Derived the relationship between blurry coefficient and system parameters (exposure time, central wavelength, bandwidth).
    • Experimentally verified performance by measuring loudspeaker vibration.

    Main Results:

    • The blurry coefficient exhibits oscillatory decay, minimizing at specific velocities.
    • Maximum measurable velocity can reach the 10th order blurry velocity.
    • Experimental results show a range from static to 25.2 mm/s with nanometer precision and 50 kHz frequency.

    Conclusions:

    • The developed OCV offers high precision, a large dynamic range, and high-velocity measurement capabilities.
    • Theoretical maximum measurable velocity can reach 1.06 m/s.
    • The OCV is suitable for mechanical structure vibration monitoring and acoustic measurements.