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Fiber-optic bend sensor using LP21 mode operation.

Yuqiang Fan1, George Wu, Wanting Wei

  • 1Department of Optical Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China.

Optics Express
|November 29, 2012
PubMed
Summary
This summary is machine-generated.

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This study introduces a new fiber-optic bending sensor using LP21 mode propagation. It accurately measures bending angle and direction with high sensitivity, offering a temperature-immune solution with low-loss transmission.

Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Material Science

Background:

  • Fiber-optic sensors offer precise measurement capabilities.
  • Existing sensors may lack sensitivity, temperature immunity, or dynamic range.
  • LP01 mode propagation is common, but higher-order modes offer new sensing possibilities.

Purpose of the Study:

  • To demonstrate a novel fiber-optic bending sensor utilizing LP21 mode.
  • To investigate the sensor's sensitivity, accuracy, and dynamic range.
  • To assess the sensor's performance regarding temperature immunity and direction detection.

Main Methods:

  • An S-bend fiber configuration on an elastic film was employed.
  • LP21 mode specklegram rotation was measured and correlated with bending angle.

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  • Theoretical analysis combined fiber coupled-mode and elastic-optic theories.

    • Main Results:

    • The sensor achieved a high experimental sensitivity of 4.13 rad/m(-1).
    • Linear correlation between bending angle and specklegram rotation was observed.
    • The sensor demonstrated temperature immunity and large dynamic range for bending detection.

    Conclusions:

    • The novel LP21 mode fiber-optic sensor accurately detects bending angle and direction.
    • The sensor's design offers high sensitivity, temperature immunity, and compatibility with existing interfaces.
    • The theoretical validation confirms the sensor's reliability and performance.