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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Balanced polarization maintaining fiber Sagnac interferometer vibration sensor.

Kenji Wada1, Hirokazu Narui, Daiki Yamamoto

  • 1Department of Physics & Electronics, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai-shi, Osaka 599-8531, Japan. wada@pe.osakafu-u.ac.jp

Optics Express
|November 24, 2011
PubMed
Summary

A novel fiber vibration sensor system uses a balanced polarization-maintaining (PM) fiber Sagnac interferometer for nearly zero-delay operation. This temperature-compensated sensor accurately detects mechanical vibrations, offering a phase shift of 4.7 milliradian/(m·με).

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Area of Science:

  • Optics and Photonics
  • Fiber Optic Sensors
  • Interferometry

Background:

  • Polarization-maintaining (PM) fiber Sagnac interferometers are crucial for precise measurements.
  • Achieving a near-zero delay operating point is essential for high-fidelity sensing.
  • Traditional fiber sensors can be susceptible to environmental temperature fluctuations.

Purpose of the Study:

  • To develop a simple, temperature-compensated fiber vibration sensor system.
  • To implement a balanced PM fiber Sagnac interferometer for enhanced performance.
  • To investigate the sensor's sensitivity to mechanical vibrations.

Main Methods:

  • Constructed a balanced PM fiber Sagnac interferometer using two orthogonally coupled PM fibers.
  • Configured one PM fiber as the sensing cable and the other as the reference cable.
  • Utilized a light-emitting diode as the light source for the interferometer.

Main Results:

  • The developed sensor system achieved a near-zero delay operating point.
  • The vibration sensor demonstrated temperature compensation.
  • A phase shift sensitivity of 4.7 milliradian/(m·με) was measured for 1 kHz vibrations.
  • Stable observation of sinusoidal and triangular wave vibrations was achieved with 10 μW input power.

Conclusions:

  • The balanced PM fiber Sagnac interferometer is effective for constructing a simple and robust vibration sensor.
  • The sensor's temperature compensation and high sensitivity make it suitable for various vibration monitoring applications.
  • The system's ability to operate at a near-zero delay point enhances measurement accuracy.