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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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A self-referencing intensity-based fiber optic sensor with multipoint sensing characteristics.

Sang-Jin Choi1, Young-Chon Kim2, Minho Song3

  • 1Department of Electrical Engineering and Smart Grid Research Center, Chonbuk National University, Jeonbuk 561-756, Korea. sang_jin@jbnu.ac.kr.

Sensors (Basel, Switzerland)
|July 22, 2014
PubMed
Summary
This summary is machine-generated.

A novel self-referencing fiber optic sensor (FOS) offers accurate intensity-based measurements. This adaptable system demonstrates reliable performance across various conditions, including strain monitoring in fiber-reinforced plastics.

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Area of Science:

  • Photonics and Optical Sensing
  • Materials Science and Engineering
  • Instrumentation and Measurement

Background:

  • Intensity-based fiber optic sensors (FOS) are widely used but often susceptible to signal fluctuations.
  • Accurate and reliable sensing requires robust designs that can compensate for environmental changes and system variations.
  • Multipoint sensing capabilities are crucial for comprehensive monitoring in various applications.

Purpose of the Study:

  • To propose and experimentally validate a self-referencing, intensity-based fiber optic sensor.
  • To define key parameters and establish a transfer function for the sensor head.
  • To demonstrate the sensor's self-referencing and multipoint sensing capabilities under diverse conditions.

Main Methods:

  • Theoretical analysis of the proposed self-referencing FOS design.
  • Experimental validation of theoretical models.
  • Characterization of sensor performance against optical power attenuation, source fluctuation, sensing point distance, fiber Bragg grating (FBG) variations, and multi-sensor configurations.
  • Power-budget analysis and measurement rate limitation assessment.
  • Strain measurement on fiber-reinforced plastic (FRP) coupons.

Main Results:

  • The theoretical analysis was confirmed through experimental results.
  • The self-referencing and multipoint sensing characteristics were validated across four distinct experimental cases.
  • The sensor demonstrated reliable performance despite optical source fluctuations and varying sensing point distances.
  • Performance was consistent with different fiber Bragg gratings (FBGs) and multi-sensor arrangements (cascade/parallel).
  • Successful strain measurement on FRP coupons was achieved.

Conclusions:

  • The proposed intensity-based FOS exhibits robust self-referencing capabilities.
  • The sensor design offers flexibility in selecting FBGs and a straightforward operational procedure.
  • This technology presents a simple yet effective solution for multipoint sensing and accurate measurements in demanding environments.