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Orientation-dependent fiber-optic inclinometer based on core-offset michelson interferometer.

Huajie Wang1, Laifang Zheng2, Junsheng Zhang2

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Summary
This summary is machine-generated.

This study introduces a novel fiber optic inclinometer using a Michelson interferometer (MI). The device accurately measures tilt angles up to 50 degrees by detecting spectral changes caused by fiber deformation.

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Area of Science:

  • Optical Engineering
  • Fiber Optic Sensors
  • Metrology

Background:

  • Fiber optic sensors offer advantages like immunity to electromagnetic interference and remote sensing capabilities.
  • Michelson interferometers (MI) are sensitive optical devices commonly used for precise measurements.
  • Developing compact and robust inclinometers for various applications remains an active area of research.

Purpose of the Study:

  • To propose and experimentally demonstrate a novel in-fiber Michelson interferometer (MI)-based inclinometer.
  • To investigate the sensor's performance in measuring tilt angles.
  • To analyze the sensor's sensitivity and orientation dependence.

Main Methods:

  • Fabrication of an in-fiber MI using a misalignment-spliced fiber with end coating.
  • Integration of the spliced fiber joint within two capillary quartz tubes for tilt application.
  • Characterization of the spectral response (wavelength and intensity) of the MI to applied tilt angles.

Main Results:

  • The proposed inclinometer demonstrated a measurable response within the tilt angle range of 0°-50°.
  • Both wavelength modulation (sensitivity of 0.55 nm/deg) and intensity modulation (sensitivity of 0.17 dB/deg) were achieved.
  • The sensor exhibited strong orientation dependence due to the asymmetric structure of the misalignment-spliced joint.

Conclusions:

  • The developed in-fiber MI inclinometer is a promising device for tilt angle measurement.
  • The sensor's performance is suitable for applications requiring accurate tilt detection.
  • The asymmetric structure offers potential for directional tilt sensing.