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Related Concept Videos

Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Related Experiment Video

Updated: May 6, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Multi-mode interferometer-based twist sensor with low temperature sensitivity employing square coreless fibers.

Binbin Song, Yinping Miao, Wei Lin

    Optics Express
    |November 13, 2013
    PubMed
    Summary

    A novel all-fiber twist sensor using a square no-core fiber multimode interferometer (MMI) was developed. This sensor exhibits high sensitivity to torsion and low sensitivity to temperature changes, making it suitable for accurate twist measurements.

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    Area of Science:

    • Optoelectronics
    • Fiber optic sensing
    • Interferometry

    Background:

    • Fiber optic sensors are crucial for various monitoring applications.
    • Multimode interferometers (MMI) offer unique spectral characteristics.
    • Accurate torsion measurement requires sensors with low temperature cross-sensitivity.

    Purpose of the Study:

    • To propose and fabricate an all-fiber twist sensor.
    • To investigate the sensing performance of the proposed sensor under torsion.
    • To evaluate the temperature cross-sensitivity of the twist sensor.

    Main Methods:

    • Fabrication of an all-fiber twist sensor by splicing square no-core fiber (NCF) with single-mode fiber.
    • Investigating transmission spectral characteristics under applied twisting angles.
    • Analyzing wavelength and transmission sensitivities to torsion.

    Main Results:

    • The twist sensor demonstrated a wavelength sensitivity of 1.28615 nm/(rad × m(-1)).
    • A transmission sensitivity of 0.11863%/ (rad × m(-1)) was achieved.
    • The sensor exhibited low temperature sensitivity due to the low thermal expansion of pure silica fiber.

    Conclusions:

    • The proposed all-fiber twist sensor based on MMI is effective for measuring torsion.
    • The sensor's low temperature sensitivity is advantageous for practical applications.
    • This sensor offers a promising solution for accurate twist sensing in various environments.