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Broadband Michelson fiber-optic accelerometer.

C Chen1, D Zhang, G Ding

  • 1Department of Optoelectronics and Information Engineering, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China.

Applied Optics
|February 29, 2008
PubMed
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A novel all-fiber-optic accelerometer using Michelson interferometry was developed. Its performance demonstrates true sensing of external stimuli, with lateral constraint impacting bandwidth.

Area of Science:

  • Optics and Photonics
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Fiber-optic sensors offer advantages in harsh environments.
  • Michelson interferometry is a robust technique for precise measurements.
  • Developing broadband accelerometers is crucial for dynamic system analysis.

Purpose of the Study:

  • To develop and characterize a broadband all-fiber-optic accelerometer.
  • To investigate the influence of mechanical constraints on accelerometer performance.
  • To validate experimental findings with theoretical models.

Main Methods:

  • Utilized a 3-dB single-mode fiber-optic beam splitter for Michelson interferometry.
  • Deposited high-reflectance aluminum films on fiber endfaces as mirrors.

Related Experiment Videos

  • Tested a prototype accelerometer to assess its response to external stimuli.
  • Varied lateral movement constraints on the acceleration-sensitive mass.

    • Main Results:

    • The all-fiber-optic accelerometer successfully sensed external stimuli across a broadband frequency range (5-500 Hz).
    • The degree of constraint on lateral movement significantly affected the useful frequency bandwidth.
    • Experimental results showed good agreement with theoretical predictions.

    Conclusions:

    • The developed all-fiber-optic accelerometer is a viable sensing device.
    • Optimizing mechanical constraints is key to maximizing the accelerometer's operational bandwidth.
    • The study provides a foundation for further advancements in fiber-optic inertial sensing.