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Research on sensitized Fiber Bragg Grating temperature sensor based on bimetal three-substrates.

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Research on a bimetallic-sensitized FBG temperature sensor.

Yin Cai1, BingBing Zhang2, JingYuan Wang2

  • 1Shandong Earthquake Agency, Ji'nan 250014, China.

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|April 4, 2023
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This study introduces a novel bimetallic-sensitized fiber Bragg grating (FBG) temperature sensor, significantly enhancing temperature measurement sensitivity. The new sensor offers a fivefold increase in sensitivity for structural health monitoring and earthquake precursor research.

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Physics

Background:

  • Accurate temperature measurement is crucial for structural health monitoring and earthquake prediction.
  • Standard fiber Bragg grating (FBG) sensors often exhibit limited sensitivity for these applications.

Purpose of the Study:

  • To develop a highly sensitive FBG temperature sensor using a bimetallic sensitization structure.
  • To analyze and optimize the structural parameters for improved sensor performance.

Main Methods:

  • Theoretical analysis of substrate and strain transfer beam dimensions and materials.
  • Selection of 7075 aluminum and 4J36 invar as bimetallic materials.
  • Design, fabrication, and performance testing of the bimetallic-sensitized FBG sensor.

Main Results:

  • The developed FBG temperature sensor achieved a sensitivity of 50.2 pm/°C.
  • This represents approximately a fivefold increase in sensitivity compared to bare FBG sensors.
  • The sensor demonstrated excellent linearity with a value greater than 0.99.

Conclusions:

  • The bimetallic sensitization approach effectively enhances FBG temperature sensor sensitivity.
  • The optimized sensor design provides a reliable and sensitive tool for temperature monitoring.
  • This research offers valuable insights for developing advanced FBG sensors with superior performance.