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Highly sensitive multicore fiber accelerometer for low frequency vibration sensing.

Josu Amorebieta1, Angel Ortega-Gomez2, Gaizka Durana2

  • 1Department of Communications Engineering, University of the Basque Country UPV/EHU, 48013, Bilbao, Spain. josu.amorebieta@ehu.eus.

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Summary
This summary is machine-generated.

We developed a compact, sensitive all-fiber accelerometer for low-frequency vibrations. This novel device uses multicore fiber (MCF) and offers a cost-effective alternative to existing accelerometers.

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Area of Science:

  • Photonics and Sensor Technology
  • Fiber Optics
  • Vibration Measurement

Background:

  • Traditional accelerometers face limitations in sensitivity and size for specific applications.
  • Optical fiber sensors offer potential advantages in harsh environments and for remote sensing.

Purpose of the Study:

  • To report on a compact, highly sensitive all-fiber accelerometer.
  • To demonstrate its suitability for low-frequency and low-amplitude vibration sensing.

Main Methods:

  • Utilized two short segments of strongly coupled asymmetric multicore fiber (MCF) fusion spliced at 180°.
  • Sandwiched MCF segments between standard single-mode fibers.
  • Interrogated the device using a spectrometer and photodetector to measure wavelength shift and power variations.

Main Results:

  • The accelerometer exhibited a narrow reflection spectrum sensitive to vibrations.
  • Demonstrated linear performance across vibration frequencies from 1 mHz to 30 Hz and accelerations from 0.76 mg to 29.64 mg.
  • Achieved a sensitivity of 2.213 nW/mg.

Conclusions:

  • The developed all-fiber accelerometer is a compact, simple, and cost-effective solution.
  • It presents a viable alternative to existing accelerometers, particularly for low-frequency and low-amplitude vibration sensing.
  • The device's high sensitivity and ease of implementation are key advantages.