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Displacement Current01:19

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Multiplexed displacement fiber sensor using thin core fiber exciter.

Zhen Chen1, Gerald Hefferman1, Tao Wei1

  • 1Department of Electrical, Computer and Biomedical Engineering, University of Rhode Island, Kingston, Rhode Island 02881, USA.

The Review of Scientific Instruments
|July 3, 2015
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Summary

This study introduces a novel multiplexed optical displacement sensor. It accurately measures position changes using fiber optic technology with minimal signal loss.

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Sensor Technology

Background:

  • Optical displacement sensors are crucial for precise motion measurement.
  • Existing technologies may face limitations in multiplexing and sensitivity.
  • Thin core fiber (TCF) offers unique properties for optical sensing applications.

Purpose of the Study:

  • To develop and demonstrate a multiplexed optical displacement sensor.
  • To utilize ultra-weak cladding mode reflection for displacement sensing.
  • To evaluate the sensor's performance, including insertion loss and linearity.

Main Methods:

  • A thin core fiber (TCF) exciter was coupled to a single mode optical fiber.
  • A buffer segment on the single mode fiber acted as the movable component.
  • Ultra-weak cladding mode reflection was used to detect refractive index discontinuities.
  • Position changes were correlated with changes in reflection delay.

Main Results:

  • The sensor demonstrated a low insertion loss of less than 3 dB.
  • A linear relationship was observed between measured and absolute positions.
  • Multiplexed operation was successfully demonstrated without crosstalk between sensors.
  • Ultra-weak cladding mode reflection effectively probed the air-buffer boundary.

Conclusions:

  • The developed TCF-based sensor provides a sensitive and linear method for optical displacement measurement.
  • The sensor architecture allows for effective multiplexing, enabling multiple measurements from a single fiber.
  • This technology holds promise for various applications requiring precise, remote, and multiplexed sensing.