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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Monostatic all-fiber rangefinder system.

Jeffrey H Leach, Stephen R Chinn, Lew Goldberg

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    Summary
    This summary is machine-generated.

    A novel monostatic rangefinder was developed, offering improved precision and smaller size by transmitting and receiving through a single aperture. This fiber-coupled system eliminates parallax, ensuring optimal alignment for accurate distance measurements.

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    Area of Science:

    • Optics and Photonics
    • Instrumentation and Measurement

    Background:

    • Traditional rangefinders often use bistatic systems with separate transmit and receive apertures, requiring precise alignment.
    • Parallax errors can occur in bistatic systems, affecting range accuracy, especially at varying distances.

    Purpose of the Study:

    • To develop a compact and high-precision rangefinder.
    • To overcome the limitations of bistatic systems by implementing a monostatic design.

    Main Methods:

    • Development of a fiber-coupled, monostatic rangefinder system.
    • Utilizing a single aperture for both signal transmission and reception.
    • Employing a 27 mm diameter/40 mm focal length transmit/receive lens.

    Main Results:

    • Achieved a standard deviation range precision of 7.8 mm at 50 m.
    • System operates at a pulse repetition frequency of 50 kilopulses per second (kpps).
    • Demonstrated elimination of parallax error between transmit and receive paths.

    Conclusions:

    • The developed monostatic rangefinder offers enhanced precision and alignment stability.
    • The single-aperture design leads to a more compact system compared to bistatic alternatives.
    • This technology is suitable for applications requiring accurate distance measurements without complex alignment procedures.