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Related Experiment Video

Updated: Jul 1, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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High sensitivity Sagnac interferometric temperature sensor using stress region refractive index modulation.

Juan Ruan, Xin Li, Ziqin Yang

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |March 4, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates an all-fiber temperature sensor using refractive index modulation. The novel sensor exhibits high sensitivity and linearity, making it suitable for environmental and industrial applications.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Material Science

    Background:

    • Accurate temperature monitoring is crucial for environmental and industrial processes.
    • Existing fiber optic sensors face challenges in sensitivity, linearity, or fabrication complexity.
    • Refractive index modulation offers a potential avenue for enhanced sensor performance.

    Purpose of the Study:

    • To experimentally demonstrate a novel all-fiber temperature sensor.
    • To investigate the temperature sensing characteristics of the proposed device.
    • To assess the sensor's suitability for practical applications.

    Main Methods:

    • Fabrication of a sensor head comprising sections of polarization-maintaining fiber (PMF) and multi-mode fiber (MMF).
    • Utilizing controlled fusion splicing and angular rotation of PMF sections to induce intentional refractive index modulation.
    • Integration of the sensor head into a Sagnac loop configuration with a 3 dB coupler.
    • Experimental characterization of temperature sensitivity and linearity over a specific temperature range.

    Main Results:

    • Successful demonstration of an all-fiber temperature sensor.
    • Achieved a high temperature sensitivity of 1.49 nm/°C.
    • Observed good linearity in temperature measurements within the range of 16°C to 55°C.
    • The sensor fabrication process is straightforward.

    Conclusions:

    • The proposed all-fiber temperature sensor based on refractive index modulation is effective.
    • The sensor offers high sensitivity and good linearity, suitable for practical temperature monitoring.
    • Its easy fabrication and performance make it a promising candidate for environmental monitoring and industrial production.