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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Salinity sensor based on polyimide-coated photonic crystal fiber.

Chuang Wu1, Bai-Ou Guan, Chao Lu

  • 1Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China.

Optics Express
|October 15, 2011
PubMed
Summary

We developed a novel salinity sensor using a special optical fiber. This sensor is highly sensitive and uses coating swelling to detect changes in salinity, offering a significant improvement over existing methods.

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Area of Science:

  • Photonics and Optical Sensing
  • Materials Science
  • Chemical Sensing

Background:

  • Optical fiber sensors offer high sensitivity for various measurements.
  • Salinity monitoring is crucial in environmental and industrial applications.
  • Existing salinity sensors face limitations in sensitivity and performance.

Purpose of the Study:

  • To propose and demonstrate a novel, highly sensitive salinity sensor.
  • To investigate the use of coating-induced pressure in optical fiber salinity sensing.
  • To achieve enhanced sensitivity compared to existing fiber optic salinity sensors.

Main Methods:

  • Fabrication of a polyimide-coated high-birefringence (Hi-Bi) photonic crystal fiber Sagnac interferometer.
  • Utilizing the radial pressure generated by polyimide coating swelling in response to salinity changes.
  • Incorporating a bare fiber Bragg grating for simultaneous temperature compensation.

Main Results:

  • Experimental demonstration of the proposed salinity sensor.
  • Achieved a high salinity sensitivity of 0.742 nm/(mol/L).
  • The sensor demonstrated 45 times higher sensitivity than a polyimide-coated fiber Bragg grating.

Conclusions:

  • The developed sensor effectively utilizes coating-induced radial pressure for highly sensitive salinity detection.
  • This approach represents a novel method for fiber optic salinity sensing.
  • The sensor offers significant advantages in sensitivity and performance for salinity monitoring.