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Highly sensitive temperature sensor using packaged optical microfiber coupler filled with liquids.

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    A new optical microfiber coupler (OMC) temperature sensor using a Teflon capillary and special liquid shows high sensitivity (5.3 nm/°C) and fast response (243 ms). This fiber optic sensor offers excellent performance for temperature monitoring.

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    Area of Science:

    • Photonics and Optical Sensing
    • Materials Science

    Background:

    • Fiber optic sensors are crucial for remote and precise measurements.
    • Optical microfiber couplers (OMCs) offer unique light manipulation properties.

    Purpose of the Study:

    • To develop a novel, highly sensitive fiber optic temperature sensor.
    • To enhance OMC-based temperature sensing performance using encapsulation techniques.

    Main Methods:

    • Fabrication of a 2 × 2 optical microfiber coupler (OMC) encapsulated within a Teflon capillary.
    • Filling the capillary with refractive index matching liquids.
    • Characterization of the sensor's temperature sensitivity and response time.

    Main Results:

    • Achieved a high temperature sensitivity of 5.3 nm/°C.
    • Demonstrated good repeatability and a fast response time of 243 ms.
    • The sealed capillary and filling liquid significantly enhanced sensing performance.

    Conclusions:

    • The novel Teflon capillary encapsulated OMC sensor exhibits superior temperature sensitivity.
    • This design represents a significant advancement in OMC-based fiber optic temperature sensing.
    • The sensor is suitable for applications requiring accurate and rapid temperature measurements.