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Related Experiment Video

Updated: Oct 12, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Etched fiber Bragg grating probe using a regular CNC machine and a 3D printer.

Vicente A Oliveira, Alexander C Carneiro, Alexandre B Dos Santos

    Applied Optics
    |November 22, 2021
    PubMed
    Summary
    This summary is machine-generated.

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    This study introduces a safer, cost-effective method for creating fiber Bragg gratings (FBGs) for refractive index (RI) sensing. The new technique uses mechanical polishing instead of hazardous chemicals, enabling precise monitoring of sugar in beverages.

    Area of Science:

    • Optical Engineering
    • Chemical Sensing
    • Materials Science

    Background:

    • Etched fiber Bragg gratings (EFBGs) are crucial for refractive index (RI) measurements, particularly for monitoring sugar consumption in alcoholic beverage fermentation.
    • Traditional EFBG fabrication involves hazardous hydrogen fluoride, posing significant safety risks.

    Purpose of the Study:

    • To develop a safe, practical, and low-cost alternative to chemical etching for creating fiber Bragg gratings for RI sensing.
    • To demonstrate the efficacy of a mechanical polishing method for diameter reduction of optical fibers for sensor applications.

    Main Methods:

    • A novel method utilizing a computer numerical control (CNC) device and a 3D-printed rod for mechanical polishing of single-mode optical fibers was employed.
    • The resulting sensor probes were calibrated using sucrose aqueous solutions across a refractive index range of 1.333 to 1.394.

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  • Refractive index measurements were validated using an Abbe refractometer.

    • Main Results:

    • The mechanically polished fiber Bragg gratings exhibited a linear response to changes in refractive index.
    • A high correlation coefficient of 0.928 was achieved, indicating the reliability of the sensor.
    • The developed method successfully produced functional RI sensors without hazardous chemical etching.

    Conclusions:

    • Mechanical polishing offers a safe and economical alternative for fabricating fiber Bragg grating sensors for refractive index monitoring.
    • This technique is suitable for applications like real-time monitoring of sugar concentration during fermentation processes.
    • The study highlights the potential of computer-aided manufacturing in developing advanced optical sensors.