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Related Experiment Video

Updated: Jun 3, 2025

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Fiber Optic Micro-Hole Salinity Sensor Based on Femtosecond Laser Processing.

Chen Li1,2,3, Chao Fan1, Hao Wu1,3

  • 1College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.

Nanomaterials (Basel, Switzerland)
|January 10, 2025
PubMed
Summary

A new fiber optic sensor uses a femtosecond laser to measure salinity. This innovative device offers high sensitivity and stability for liquid analysis in biomedical and chemical applications.

Keywords:
Fabry–Perotfemtosecond lasermicro-hole

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Area of Science:

  • Optical Engineering
  • Sensor Technology
  • Materials Science

Background:

  • Accurate salinity measurement is crucial for various applications.
  • Existing salinity sensors may have limitations in sensitivity, stability, or ease of use.

Purpose of the Study:

  • To develop a novel reflective fiber Fabry-Perot (F-P) salinity sensor.
  • To enable direct liquid involvement in light transmission for enhanced sensing.

Main Methods:

  • Fabrication of an open liquid cavity using a femtosecond laser.
  • Precise control of optical fiber dimensions via femtosecond laser cutting and chemical polishing.
  • Monitoring spectral shifts in response to changes in liquid refractive index.

Main Results:

  • Achieved a salinity sensitivity of 0.288 nm/% over a 0-25% salinity range.
  • Demonstrated minimal temperature sensitivity (0.015 nm/°C), allowing for negligible temperature effects.
  • Sensor exhibits compact size, high mechanical robustness, and excellent reproducibility.

Conclusions:

  • The novel F-P salinity sensor offers a promising solution for accurate and reliable salinity monitoring.
  • Its characteristics make it suitable for diverse sensing applications in biomedicine and chemical engineering.
  • The direct liquid involvement in the open cavity design enhances sensing performance.