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Temperature-independent tilted fiber grating vibration sensor based on cladding-core recoupling.

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Summary
This summary is machine-generated.

This study introduces a novel fiber optic sensor for vibration detection. The temperature-independent sensor achieves high sensitivity to microbending and can detect vibrations up to 2 kHz using cost-effective power detection.

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Area of Science:

  • Photonics and Optical Sensing
  • Materials Science and Engineering

Background:

  • Fiber optic sensors are crucial for various monitoring applications.
  • Existing sensors often suffer from temperature cross-sensitivity and limited bandwidth.
  • Development of robust, high-sensitivity, and temperature-immune sensing solutions is needed.

Purpose of the Study:

  • To develop a novel fiber optic sensing structure for vibration and microbending detection.
  • To demonstrate temperature-independent operation of the proposed sensor.
  • To evaluate the sensor's sensitivity and frequency response for practical applications.

Main Methods:

  • Fabrication of a novel structure by splicing a short optical fiber stub with a weakly tilted Bragg grating to an offset fiber.
  • Characterization of the reflected power spectrum under different conditions (temperature, bending, vibration).
  • Analysis of the sensor's sensitivity to microbending and its frequency response up to 2 kHz.

Main Results:

  • The novel structure exhibits temperature-independent total reflected power in two distinct wavelength bands.
  • One wavelength band shows power variations directly correlated with fiber stub bending and vibration.
  • The sensor demonstrates extremely high sensitivity to microbending and a frequency response exceeding 2 kHz.

Conclusions:

  • The developed fiber optic sensing structure offers a promising solution for temperature-immune vibration measurements.
  • The cost-effective power detection method enhances its practical applicability.
  • This technology enables highly sensitive microbending detection and robust vibration monitoring.