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Optical Fiber Displacement Sensor Based on Microwave Photonics Interferometry.

Hao Dong1, Shicheng Liu2, Liming Yang3

  • 1College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. donghao@nuaa.edu.cn.

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|November 3, 2018
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Summary
This summary is machine-generated.

This study introduces an optical fiber displacement sensor using microwave photonics interferometry (MWPI) for precise, long-range measurements. The novel sensor achieves a large measurement range exceeding 3 meters with high resolution, offering a robust solution for displacement sensing applications.

Keywords:
displacement sensorinterferometrymicrowave photonicsposition sensor

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Area of Science:

  • Optoelectronics
  • Photonics
  • Microwave Engineering

Background:

  • Accurate displacement measurement is crucial in various industrial and scientific applications.
  • Existing methods may face limitations in range, resolution, or environmental robustness.
  • Optical fiber sensors offer advantages like immunity to electromagnetic interference and remote sensing capabilities.

Purpose of the Study:

  • To propose and experimentally validate a novel optical fiber displacement sensor.
  • To achieve large-range displacement measurement with high resolution using microwave photonics interferometry.
  • To investigate the performance, stability, and error sources of the developed sensor.

Main Methods:

  • Utilizing a Michelson microwave photonics interferometer (MWPI) configuration.
  • Employing a sensing arm and a length-adjusted reference arm to detect displacement.
  • Leveraging the change in the microwave response function's period with displacement.
  • Using a vector network analyzer (VNA) to retrieve displacement based on the microwave response function and free spectral range (FSR) principles.
  • Incorporating a programmable path-switching true time delay line to reduce microwave bandwidth.

Main Results:

  • Demonstrated a displacement sensing range exceeding 3 meters.
  • Achieved a measurement resolution of 31 micrometers.
  • Verified the sensor's capability for precise displacement retrieval.
  • Investigated measurement stability and identified key error sources.

Conclusions:

  • The proposed MWPI-based optical fiber displacement sensor is a viable solution for large-range, high-resolution measurements.
  • The sensor design effectively translates displacement into measurable microwave signal variations.
  • Further analysis of error factors can optimize sensor performance for demanding applications.