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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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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Length-extended 3D shape sensor using wavelength/space-division multiplexing grating arrays in a multicore fiber.

Yanjie Meng, Shuai Xiao, Rongyi Shan

    Optics Letters
    |August 2, 2024
    PubMed
    Summary

    This study introduces a novel multicore fiber grating method to extend 3D shape sensing length, overcoming limitations of traditional fiber Bragg grating (FBG) technology. The new approach enables longer, more accurate shape reconstruction even in varying temperatures.

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    Last Updated: Jun 18, 2025

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    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Sensors

    Background:

    • Traditional fiber Bragg grating (FBG) technology faces limitations in multiplexing capacity, hindering improvements in 3D shape sensing length.
    • Extending the sensing length is crucial for applications requiring detailed structural monitoring over larger areas.

    Purpose of the Study:

    • To propose and demonstrate a novel method for extending the sensing length in 3D shape sensing using multicore fiber gratings.
    • To overcome the multiplexing limitations inherent in conventional FBG-based shape sensing.

    Main Methods:

    • A wavelength-division and space-division multiplexing multicore fiber grating method was developed.
    • Femtosecond-laser point-by-point technology was used to inscribe WDM grating arrays in six outer cores of a seven-core fiber.
    • Two segments, each comprising three cores for shape sensing, were combined to form the sensor.

    Main Results:

    • The proposed shape sensor achieved 2D and 3D shape sensing with a length of 967 mm.
    • The method effectively mitigated temperature variations' effects on sensing accuracy.
    • Maximum shape reconstruction errors per unit length were 1.89% (2D), 2.72% (3D), and 1.47% (arbitrary shape) under variable temperatures.

    Conclusions:

    • The proposed multicore fiber grating method successfully extends the achievable length for 3D shape sensing.
    • This technique offers a promising solution for longer-range shape sensing applications.
    • Further extension of sensing length is feasible by employing multicore fibers with a higher core count.