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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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A Highly Sensitive Two-Dimensional Inclinometer Based on Two Etched Chirped-Fiber-Grating Arrays.

Hung-Ying Chang1, Yu-Chung Chang2, Wen-Fung Liu3

  • 1Program of Electrical and Communications Engineering, Feng-Chia University, 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan. hungying.chang@gmail.com.

Sensors (Basel, Switzerland)
|December 16, 2017
PubMed
Summary
This summary is machine-generated.

We developed a novel fiber-optic inclinometer using etched chirped fiber Bragg gratings (CFBG) to precisely measure tilt angle and direction. This temperature-insensitive sensor offers high resolution for continuous monitoring in harsh environments.

Keywords:
chirped fiber Bragg grating (CFBG)etched fiber Bragg gratingfiber sensorinclinometerlevel metertilt meter

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensors
  • Instrumentation

Background:

  • Accurate inclination measurement is crucial for structural health monitoring and control systems.
  • Existing inclinometers often face limitations in sensitivity, resolution, and environmental robustness, particularly concerning temperature variations.
  • Fiber Bragg Gratings (FBGs) offer potential for high-sensitivity sensing, but their application in two-dimensional inclination measurement requires novel configurations.

Purpose of the Study:

  • To introduce a novel two-dimensional fiber-optic inclinometer.
  • To achieve high sensitivity and resolution in simultaneous tilt angle and direction measurements.
  • To develop a temperature-insensitive sensing solution for inclination monitoring in challenging environments.

Main Methods:

  • Fabrication of a two-dimensional inclinometer using crisscrossed arrays of etched chirped fiber Bragg gratings (CFBG).
  • Modification of CFBGs by etching away cladding to expose the evanescent wave, enhancing sensitivity to refractive index changes.
  • Interrogation of reflection spectra to analyze superposition peaks induced by partial immersion in liquid, enabling simultaneous angle and direction deduction.

Main Results:

  • Achieved a high resolution of 0.003° for tilt angle measurement.
  • Demonstrated a resolution of 0.00187 rad for tilt direction measurement.
  • The sensor exhibited temperature insensitivity due to its unique sensing mechanism.

Conclusions:

  • The proposed fiber-optic inclinometer effectively measures two-dimensional tilt with high precision.
  • The sensor's temperature insensitivity and robustness make it suitable for long-term monitoring in harsh conditions.
  • This technology holds promise for applications requiring real-time feedback control of tilt angles.