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Related Experiment Video

Updated: Feb 11, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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High performance all-fiber temperature sensor based on coreless side-polished fiber wrapped with

Caiyan He, Junbin Fang, Yanan Zhang

    Optics Express
    |May 3, 2018
    PubMed
    Summary

    A novel coreless side-polished fiber (CSPF) coated with polydimethylsiloxane (PDMS) shows high temperature sensitivity. This fiber structure offers excellent stability and reversibility for accurate temperature sensing applications.

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    Area of Science:

    • Optoelectronics and Photonics
    • Materials Science and Engineering
    • Sensor Technology

    Background:

    • Development of novel fiber optic sensors for precise environmental monitoring.
    • Limitations of existing temperature sensing technologies in terms of sensitivity, stability, and reversibility.
    • Exploration of multimode interference (MMI) in fiber structures for sensing applications.

    Purpose of the Study:

    • To demonstrate a novel coreless side-polished fiber (CSPF) structure coated with polydimethylsiloxane (PDMS) for enhanced temperature sensing.
    • To investigate the temperature sensing characteristics, including sensitivity, linearity, stability, and reversibility, of the PDMS-coated CSPF (PDMSW-CSPF).
    • To analyze the influence of residual thickness (RT) and spectral dip wavelength on the sensor's performance.

    Main Methods:

    • Fabrication of a coreless side-polished fiber (CSPF) structure.
    • Coating the CSPF with polydimethylsiloxane (PDMS) to create the PDMSW-CSPF.
    • Numerical simulations and experimental measurements to analyze spectral shifts and temperature sensitivity.
    • Investigating the effect of residual thickness (RT) and dip wavelength on sensitivity.
    • Conducting cyclic heating and cooling experiments to evaluate sensor stability and reversibility.

    Main Results:

    • The PDMSW-CSPF exhibits high temperature sensitivity (-0.4409 nm/°C) in the 30-85°C range with a PDMS residual thickness of 43.26 μm.
    • The sensor demonstrates high linearity (0.9974) and excellent stability with a low standard deviation (0.141 nm).
    • Cyclic experiments show a low relative deviation of sensitivity (RSD) of ± 0.068%, indicating superior reversibility compared to other fiber structures.
    • Sensitivity can be further enhanced by reducing residual thickness and selecting longer wavelength dips.

    Conclusions:

    • The novel PDMSW-CSPF is a highly sensitive, stable, and reversible fiber optic sensor for temperature monitoring.
    • The sensor's performance is significantly influenced by residual thickness and spectral dip selection, offering avenues for optimization.
    • This technology holds promise for advanced applications requiring precise and reliable temperature sensing.