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Sensitivity-Enhanced Extrinsic Fabry-Perot Interferometric Fiber-Optic Microcavity Strain Sensor.

Zhibo Ma1,2, Shaolei Cheng3,4, Wanying Kou5,6

  • 1Shaanxi Key Lab of MEMS/NEMS, Northwestern Polytechnical University, Xi'an 710072, China. zbma@nwpu.edu.cn.

Sensors (Basel, Switzerland)
|September 25, 2019
PubMed
Summary

This study introduces an enhanced extrinsic Fabry-Perot interferometric (EFPI) fiber-optic strain sensor. The novel design significantly boosts strain sensitivity and maintains high linearity, with minimal strain-temperature cross-sensitivity.

Keywords:
Fabry–Perot cavityfiber-optic sensorsensitivitystrain sensor

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Sensor Technology

Background:

  • Fiber-optic sensors offer advantages in harsh environments.
  • Extrinsic Fabry-Perot Interferometers (EFPI) are suitable for precise measurements.
  • Enhancing strain sensitivity in EFPI sensors is crucial for advanced applications.

Purpose of the Study:

  • To develop and characterize a novel EFPI fiber-optic strain sensor.
  • To investigate the impact of a long glass capillary on strain sensitivity.
  • To evaluate the linearity and temperature cross-sensitivity of the proposed sensor.

Main Methods:

  • Fabrication of an EFPI sensor using two single-mode fibers (SMFs) and a glass capillary.
  • Utilizing ultraviolet (UV) curable adhesives for fiber fixation.
  • Experimental measurement of cavity length changes under applied strain.
  • Analysis of sensor performance including sensitivity, linearity, and temperature cross-sensitivity.

Main Results:

  • The microcavity EFPI strain sensor demonstrated significantly enhanced strain sensitivity.
  • Sensitivities of 15.928 nm/με, 25.281 nm/με, and 40.178 nm/με were achieved for different initial cavity lengths.
  • Excellent linearity (close to unity) was observed for strain measurements exceeding 3500 με.
  • Extremely low strain-temperature cross-sensitivity was confirmed.

Conclusions:

  • The proposed EFPI fiber-optic strain sensor with a long glass capillary effectively enhances strain sensitivity.
  • The sensor exhibits high linearity and minimal temperature cross-sensitivity, making it suitable for accurate strain monitoring.
  • This technology holds promise for various applications requiring precise and reliable strain measurement.