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Geometrical parameter analysis of a high-sensitivity fiber optic angular displacement sensor.

João M S Sakamoto, Gefeson M Pacheco, Cláudio Kitano

    Applied Optics
    |January 22, 2015
    PubMed
    Summary

    This study analyzed fiber optic angular displacement sensors, finding that core radius, lens focal length, and light coupling efficiency are key to performance. Other geometric factors have minimal impact on sensor sensitivity and linear range.

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    Area of Science:

    • Optoelectronics
    • Optical Sensing
    • Mechanical Engineering

    Background:

    • Fiber optic sensors offer precise measurement capabilities.
    • Angular displacement sensing is crucial in various industrial applications.
    • Optimizing sensor design requires understanding geometric parameter influences.

    Purpose of the Study:

    • To analyze the impact of geometrical parameters on fiber optic angular displacement sensor performance.
    • To identify critical parameters affecting sensor sensitivity and linear range.
    • To validate simulation findings with experimental data.

    Main Methods:

    • Computational simulations were performed to model sensor behavior.
    • Experiments were conducted using a prototype fiber optic sensor.
    • Key geometrical parameters including lens focal length, fiber gap, cladding radii, numerical aperture, and standoff distance were systematically varied.

    Main Results:

    • Emitting fiber core radius, lens focal length, and light coupling efficiency significantly influence sensor sensitivity and linear range.
    • Fiber gap, cladding radii, numerical aperture, and standoff distance showed minimal impact.
    • Sensor sensitivity to spurious linear displacement was also analyzed.

    Conclusions:

    • Optimizing the emitting fiber core radius and lens focal length is crucial for enhancing fiber optic angular displacement sensor performance.
    • Light coupling efficiency is a primary factor in achieving desired sensor characteristics.
    • The study provides valuable insights for designing more effective fiber optic angular displacement sensors.