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Related Experiment Video

Updated: Jun 17, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Low-cost high-performance fiber-optic pH sensor based on thin-core fiber modal interferometer.

Bobo Gu1, Ming-Jie Yin, A Ping Zhang

  • 1Center for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China.

Optics Express
|January 7, 2010
PubMed
Summary

A novel fiber-optic pH sensor utilizes a modal interferometer and nanocoating for rapid, precise measurements across a wide pH range. This technology offers a high-resolution solution for real-time pH monitoring in various applications.

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Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Nanotechnology

Background:

  • Accurate pH monitoring is crucial in diverse fields, including environmental science, medicine, and industrial processes.
  • Traditional pH sensors often face limitations such as slow response times, drift, and fragility.
  • Developing robust, high-resolution fiber-optic pH sensors is an active area of research.

Purpose of the Study:

  • To present a novel fiber-optic pH sensor.
  • To demonstrate the sensor's performance using a thin-core fiber modal interferometer and electrostatic self-assembled nanocoating.
  • To evaluate the sensor's response speed, linearity, and resolution within a specific pH range.

Main Methods:

  • Fabrication of an in-fiber modal interferometer by splicing a thin-core fiber into a standard single-mode fiber.

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Last Updated: Jun 17, 2026

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  • Excitation and interference of high-order cladding modes with the core mode.
  • Deposition of poly(allylamine hydrochloride) and poly(acrylic acid) nanocoating onto the sensor surface via electrostatic self-assembly.
  • Testing the sensor's response in acidic and alkaline solutions (pH 2.5–10).

    • Main Results:

    • The fiber-optic sensor exhibited a fast and linear response to pH changes.
    • The sensor demonstrated high resolution, achieving a precision of 0.013 pH units.
    • The electrostatic self-assembled nanocoating effectively facilitated pH sensing.

    Conclusions:

    • The developed fiber-optic pH sensor offers a promising solution for accurate and real-time pH measurements.
    • The combination of modal interferometry and nanocoating provides a sensitive and robust sensing platform.
    • This technology has potential applications in fields requiring precise pH monitoring.