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Related Experiment Video

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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Temperature and liquid refractive index sensor using P-D fiber structure-based Sagnac loop.

Hanglin Lu, Yaoli Yue, Jing Du

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    Summary

    A novel fiber optic sensor using a polarization-maintaining fiber (PMF) and multimode D-shaped optical fiber (MMDF) can simultaneously measure temperature and liquid refractive index (RI). This cost-efficient Sagnac loop sensor achieves high sensitivity and resolution for both parameters.

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    Area of Science:

    • Optical Fiber Sensing
    • Photonics
    • Metrology

    Background:

    • Accurate simultaneous measurement of temperature and refractive index (RI) is crucial in various scientific and industrial applications.
    • Existing fiber optic sensors often face limitations in cost-efficiency, sensitivity, or simultaneous measurement capabilities.

    Purpose of the Study:

    • To propose and experimentally demonstrate a cost-efficient Sagnac loop sensor based on a polarization-maintaining fiber (PMF) and multimode D-shaped optical fiber (MMDF) structure.
    • To investigate the sensor's capability for simultaneous measurement of temperature and liquid RI.
    • To achieve high sensitivity and resolution for both measured parameters.

    Main Methods:

    • Fabrication of a P-D fiber structure by fusion splicing a PMF section to an MMDF.
    • Integration of the P-D structure into a Sagnac loop using a 3dB coupler.
    • Experimental investigation of the sensor's spectral responses to temperature and RI variations.

    Main Results:

    • The proposed sensor exhibits distinct spectral responses for temperature and RI, enabling simultaneous measurement.
    • High sensitivities of -1.804 nm/°C for temperature and -131.49 nm/RIU for RI were achieved.
    • The sensor achieved resolutions of 0.01°C for temperature and 2.46 × 10-4 RIU for RI.

    Conclusions:

    • The developed P-D fiber structure-based Sagnac loop sensor is a cost-efficient and effective platform for simultaneous temperature and RI sensing.
    • The sensor's high sensitivity and resolution demonstrate its potential for practical applications in biological and chemical fields.
    • This work contributes to the advancement of optical fiber sensing technologies for complex environmental monitoring.