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An Optical Fiber Displacement Sensor Using RF Interrogation Technique.

Hyeon-Ho Kim1, Sang-Jin Choi2, Keum Soo Jeon3

  • 1Department of Electrical Engineering and Smart Grid Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Korea. khhjjh@jbnu.ac.kr.

Sensors (Basel, Switzerland)
|March 2, 2016
PubMed
Summary
This summary is machine-generated.

We developed a new non-contact optical fiber displacement sensor using radio frequency (RF) modulation. This sensor accurately measures displacement by analyzing the free spectral range (FSR) of a Mach-Zehnder electro-optical modulator (MZ-EOM).

Keywords:
Mach-Zehnder electro-optical modulator (MZ-EOM)free spectral range (FSR)optical fiber displacement sensorradio frequency (RF)wavelength division multiplexing (WDM)

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Area of Science:

  • Photonics
  • Optical Sensing
  • Metrology

Background:

  • Non-contact displacement sensing is crucial for various industrial and scientific applications.
  • Existing methods often face limitations in sensitivity, range, or complexity.
  • 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 non-contact optical fiber displacement sensor.
  • To utilize a radio frequency (RF) interrogation technique based on Mach-Zehnder electro-optical modulator (MZ-EOM) modulation.
  • To demonstrate the sensor's sensitivity, resolution, and multiplexing capabilities.

Main Methods:

  • Employing a radio frequency (RF) interrogation technique.
  • Utilizing bidirectional modulation of a Mach-Zehnder electro-optical modulator (MZ-EOM).
  • Measuring displacement via the free spectral range (FSR) derived from the modulated MZ-EOM transfer function's dip frequencies.

Main Results:

  • Achieved a sensitivity of 456 kHz/mm or 1.043 kHz/V over a 7 mm measurement range.
  • Demonstrated potential for displacement resolution better than 0.05 μm with specific optical source parameters (linewidth < 1.5 nm, received power > -36 dBm).
  • Experimentally validated the multiplexing characteristics of the proposed sensor.

Conclusions:

  • The proposed non-contact optical fiber displacement sensor offers high sensitivity and potential for high resolution.
  • The RF interrogation technique combined with MZ-EOM modulation provides an effective method for displacement measurement.
  • The sensor's validated multiplexing capability suggests potential for multi-point sensing applications.