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All-POF coupling ratio-imbalanced Sagnac interferometer as a refractive index sensor.

H Santiago-Hernández, B Bravo-Medina, A Mora-Nuñez

    Applied Optics
    |October 6, 2021
    PubMed
    Summary
    This summary is machine-generated.

    A novel polymer optical Sagnac interferometer offers a compact, low-cost refractive index sensor. This fiber optic sensor demonstrates a sensitive response to varying sugar solution concentrations.

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    Area of Science:

    • Photonics
    • Optical Sensing
    • Fiber Optics

    Background:

    • Refractive index sensing is crucial for various applications.
    • Existing sensors can be complex or costly.
    • Polymer optical fibers offer potential for low-cost sensor development.

    Purpose of the Study:

    • To propose and demonstrate a novel polymer optical Sagnac interferometer.
    • To develop a compact and low-cost refractive index sensor.
    • To investigate its performance for measuring sugar solution concentrations.

    Main Methods:

    • Fabrication of a Sagnac interferometer using a single piece of polymer optical fiber.
    • Development of a fiber coupler using chemical and twisting techniques.
    • Modifying the coupling ratio by varying the surrounding medium's refractive index.
    • Measuring transmittance changes in sugar solutions of varying concentrations.
    • Calibrating the sensor at 733 nm.
    • Estimating refractive index using a linear model based on transmittance data.

    Main Results:

    • Transmittance decreases with increasing mass concentration of sugar solutions.
    • The rate of transmittance decay varies with concentration (faster at low, slower at high).
    • The sensor demonstrated larger transmission variations at 733 nm.
    • A resolution of 0.057 weight percent of sugar solution was achieved.

    Conclusions:

    • The polymer optical Sagnac interferometer is a viable compact and low-cost refractive index sensor.
    • The sensor shows sensitivity to changes in refractive index, correlated with sugar concentration.
    • The proposed method allows for effective refractive index estimation with good resolution.