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No-core fiber-based highly sensitive optical fiber pH sensor.

Vanita Bhardwaj1, Akhilesh Kumar Pathak1, Vinod Kumar Singh1

  • 1Indian Institute of Technology (Indian School of Mines), Department of Applied Physics, Dhanbad, Jharkhand, India.

Journal of Biomedical Optics
|May 6, 2017
PubMed
Summary

This study presents a novel optical fiber pH sensor fabricated using sol-gel methods. The sensor demonstrates high sensitivity across a broad pH range (2-13) and shows unique responses to ionic strength and temperature.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Optical Engineering

Background:

  • Accurate pH monitoring is crucial in various scientific and industrial applications.
  • Existing pH sensors often face limitations in sensitivity, range, or environmental adaptability.
  • Optical fiber sensors offer potential advantages in remote and harsh environment sensing.

Purpose of the Study:

  • To fabricate and characterize a novel optical fiber pH sensor.
  • To evaluate the sensor's performance across a wide pH range (2-13).
  • To investigate the influence of environmental factors like ionic strength and temperature on sensor response.

Main Methods:

  • Fabrication of the sensing head using a sol-gel technique with tetraethyl orthosilicate.
  • Incorporation of a no-core fiber section coated with indicator dyes (bromophenol blue, cresol red, chlorophenol red).
  • Characterization of the sensor's reflection spectrum and wavelength shifts in response to varying pH levels.

Main Results:

  • The optical fiber pH sensor demonstrated high sensitivities of 1.02 nm/pH in acidic and 0.93 nm/pH in alkaline solutions.
  • The sensor exhibited a wide operational pH range from 2 to 13.
  • Significant shifts in resonance wavelength (blueshift for alkaline, redshift for acidic) were observed, with notable responses to ionic strength and temperature.

Conclusions:

  • The developed sol-gel based optical fiber pH sensor is effective for measuring a wide pH range with high sensitivity.
  • The sensor's response to ionic strength and temperature provides an advantage over conventional pH sensors.
  • This technology holds promise for advanced chemical sensing applications.