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A Low Frequency FBG Accelerometer with Symmetrical Bended Spring Plates.

Fufei Liu1, Yutang Dai2, Joseph Muna Karanja3

  • 1National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Luoshi Road 122, 430070 Wuhan, China. liufufei_2000@126.com.

Sensors (Basel, Switzerland)
|January 25, 2017
PubMed
Summary
This summary is machine-generated.

A novel fiber Bragg grating (FBG) accelerometer uses bended spring plates to double wavelength shifts for enhanced low-frequency vibration monitoring. This design achieves high sensitivity, exceeding 1000 pm/g within the 0.7-20 Hz range.

Keywords:
accelerometerfiber optics sensorlow frequencyvibration monitoring

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Area of Science:

  • Sensor Technology
  • Mechanical Engineering
  • Optoelectronics

Background:

  • Low-frequency vibration monitoring is crucial for structural health and industrial applications.
  • Existing accelerometers may lack the required sensitivity or frequency response for certain low-frequency environments.
  • Fiber Bragg Grating (FBG) sensors offer advantages in harsh conditions but require optimized designs for specific applications.

Purpose of the Study:

  • To propose and analyze a new fiber Bragg grating (FBG) accelerometer design for effective low-frequency vibration monitoring.
  • To investigate the mechanical principles and structural parameters influencing the performance of the proposed FBG accelerometer.
  • To validate the design's sensitivity and frequency response through experimental testing.

Main Methods:

  • Development of a novel accelerometer utilizing two symmetrical bended spring plates as elastic elements.
  • Application of a mechanics model and numerical methods to analyze the influence of structural parameters on sensitivity and eigenfrequency.
  • Experimental testing to measure the accelerometer's performance within a specified frequency range.

Main Results:

  • The proposed FBG accelerometer design effectively doubles the wavelength shift by inducing equal and opposite axial strains on the FBG.
  • The mechanics model and numerical analysis provide insights into optimizing structural parameters for enhanced sensitivity and eigenfrequency.
  • Experimental results demonstrate a sensitivity exceeding 1000 pm/g for vibrations within the 0.7-20 Hz frequency range.

Conclusions:

  • The novel FBG accelerometer with bended spring plates is a viable solution for high-sensitivity, low-frequency vibration monitoring.
  • The design offers improved performance compared to conventional accelerometers in the targeted frequency band.
  • Further optimization based on the presented models can lead to even more advanced FBG-based sensing systems.