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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Compact fiber optic dual-detection confocal displacement sensor.

Dong-Ryoung Lee, Suin Jang, Min Woo Lee

    Applied Optics
    |September 24, 2016
    PubMed
    Summary

    We developed a dual-detection confocal displacement sensor (DDCDS) using a compact fiber-optic probe. This sensor accurately measures micromovement and fast vibration by analyzing light intensity ratios from a double-clad fiber.

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    Area of Science:

    • Optics and Photonics
    • Sensor Technology
    • Fiber Optics

    Background:

    • Confocal displacement sensing is crucial for precise metrology.
    • Existing methods often involve complex setups or bulky components.
    • There is a need for compact, robust, and easily alignable displacement sensors.

    Purpose of the Study:

    • To introduce a novel dual-detection confocal displacement sensor (DDCDS).
    • To demonstrate a compact and robust all-fiber-optic sensor probe.
    • To establish a linear relationship for axial position measurement using intensity ratios.

    Main Methods:

    • Utilizing a gradient refractive index lens and a double-clad fiber (DCF) in a compact probe.
    • Employing two point detectors coupled to single-mode and multi-mode fibers.
    • Measuring light intensities from the core and inner clad of the DCF.
    • Analyzing the ratio of axial response curves from the two detectors.

    Main Results:

    • Achieved a linear relationship between object plane axial position and the ratio of intensity signals.
    • Successfully demonstrated the sensor's capability in measuring micromovement.
    • Validated performance in detecting fast vibration with the proposed method.

    Conclusions:

    • The proposed DDCDS offers a simple, robust, and compact solution for displacement sensing.
    • The fiber-optic probe simplifies alignment and enhances sensor durability.
    • The intensity ratio method provides a reliable means for precise axial position determination.