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Optical fiber pH sensor based on a multimode interference device with polymer overlay.

P M Velasco-Bolom, J L Camas-Anzueto, D Lopez-Cortes

    Applied Optics
    |September 14, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel optical fiber pH sensor using multimode interference. Chemical etching enhances sensitivity, offering a rapid and linear response for accurate pH monitoring.

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    Area of Science:

    • Optoelectronics
    • Chemical Sensing
    • Materials Science

    Background:

    • Accurate pH monitoring is crucial in various scientific and industrial applications.
    • Existing pH sensors may face limitations in response time, sensitivity, or reusability.
    • Optical fiber sensors offer advantages like remote sensing and immunity to electromagnetic interference.

    Purpose of the Study:

    • To develop and characterize a highly sensitive optical fiber pH sensor.
    • To investigate the effect of structural modification on sensor performance.
    • To demonstrate a rapid and linear response for practical pH measurements.

    Main Methods:

    • Fabrication of a multimode interference (MMI) optical fiber sensor.
    • Coating the no-core fiber (NCF) with polyallylamine hydrochloride and polyacrylic acid using a layer-by-layer (LbL) self-assembly method.
    • Chemical etching to reduce the NCF diameter and enhance sensitivity.

    Main Results:

    • The optical fiber pH sensor demonstrated increased sensitivity from -0.31 nm/pH to -2 nm/pH after chemical etching.
    • A high linear response (R² = 0.997) was achieved over a broad pH range (5 to 11.3).
    • The sensor exhibited a rapid response time of less than 1 second.

    Conclusions:

    • The developed optical fiber pH sensor shows significant potential for high-performance pH monitoring.
    • Chemical etching is an effective method for enhancing the sensitivity of NCF-based MMI sensors.
    • The sensor's rapid and linear response makes it suitable for real-time pH detection applications.