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    This study introduces a novel microparticle velocity sensor using a conical lens fiber array. The new sensor offers improved signal-to-noise ratio, a smaller blind area, and a wider detection range for precise particle velocity measurements.

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    Area of Science:

    • Optics and Photonics
    • Sensor Technology
    • Particle Physics

    Background:

    • Traditional fiber optic sensors face limitations in harsh environments.
    • Microparticle velocity sensing is crucial for various industrial and environmental applications.
    • Signal deterioration due to particle movement deviation impacts sensor accuracy.

    Purpose of the Study:

    • To develop and characterize a novel microparticle velocity sensor.
    • To investigate the performance of a conical lens fiber array for spatial filtering.
    • To compare the new sensor's capabilities against conventional flat-end fiber sensors.

    Main Methods:

    • Linear arraying of conical lens fibers to create a spatial filter.
    • Systematic investigation of sensor characteristics: cone angle, divergence angle, aperture angle, blind area, and detection area.
    • Comparative analysis with a sensor utilizing a standard flat end fiber array.

    Main Results:

    • The conical lens fiber array sensor demonstrates a high signal-to-noise ratio.
    • The developed sensor exhibits a reduced blind area and an expanded detection area.
    • The sensor design effectively mitigates signal deterioration caused by particle movement deviations.

    Conclusions:

    • The conical lens fiber sensor offers superior performance compared to flat-end fiber sensors.
    • Its compact structure, high electromagnetic noise tolerance, corrosion resistance, and temperature resistance make it suitable for harsh environments.
    • Potential applications include sand movement monitoring, combustion particle analysis, and other microparticle sensing tasks.