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Related Concept Videos

Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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Updated: Aug 15, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Soft joint shape measurement device based on FBG with a simple demodulating system.

Xianghui Yin, Qingmin Liao, Xueqian Wang

    Applied Optics
    |January 6, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method for measuring soft joint 3D shapes using fiber Bragg gratings (FBGs). The technique achieves high accuracy, with errors under 0.7%, enabling precise continuous measurements.

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    Area of Science:

    • Robotics
    • Mechanical Engineering
    • Sensor Technology

    Background:

    • Soft joint shape measurement is difficult due to reliance on internal sensors and inefficient discrete point measurements.
    • Existing methods struggle with complex shapes requiring continuous data.
    • Fiber Bragg gratings (FBGs) offer sensitivity and flexibility but face demodulation challenges.

    Purpose of the Study:

    • To develop an effective continuous 3D shape measurement device for soft joints using FBGs.
    • To address the open research problem of FBG demodulation for soft robotics.
    • To achieve high-precision shape estimation for soft structures.

    Main Methods:

    • Proposed a novel shape measurement device utilizing a sensor with three FBGs embedded within the soft joint.
    • Developed a simple FBG demodulation system leveraging filter overlapping properties.
    • Designed a calibration process for FBG signals to ensure accuracy.

    Main Results:

    • The proposed method achieved a relative error of less than 0.7% in soft joint shape measurement experiments.
    • Continuum robot measurements demonstrated precision comparable to motion-capturing systems.
    • The system enables efficient, continuous 3D shape measurement of soft joints.

    Conclusions:

    • The developed FBG-based system provides an effective solution for continuous soft joint 3D shape measurement.
    • The novel demodulation and calibration techniques overcome key challenges in FBG sensing.
    • This advancement offers high-precision measurement capabilities for soft robotic applications.