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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
09:03

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Published on: January 7, 2019

Fiber-optic sensor for liquid level measurement.

J E Antonio-Lopez1, J J Sanchez-Mondragon, P LiKamWa

  • 1Optics Department, Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Tonantzintla, Puebla, Mexico.

Optics Letters
|September 3, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a novel liquid level sensor using multimode interference (MMI) in no-core fiber. The inexpensive sensor offers linear response, multiplexing capabilities, and refractive index measurement for various applications.

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Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Interferometric Sensing

Background:

  • Liquid level sensing is crucial in many industrial and scientific applications.
  • Existing methods often face challenges with cost, complexity, or accuracy.
  • Multimode interference (MMI) offers a promising physical phenomenon for sensor development.

Purpose of the Study:

  • To propose and demonstrate a novel liquid level sensor based on multimode interference (MMI) effects.
  • To investigate the sensor's performance characteristics, including linearity and sensing range.
  • To explore the potential for refractive index measurement and multiplexed operations.

Main Methods:

  • Utilizing a no-core fiber (NCF) as the sensing element within an MMI device.
  • Analyzing the modification of MMI self-imaging properties due to surrounding liquid.
  • Correlating changes in optical output with liquid level and refractive index.

Main Results:

  • Demonstrated a highly linear response between the sensor's output and the liquid level.
  • Achieved accurate refractive index measurement through wavelength shift analysis.
  • Showcased the sensor's suitability for both continuous and discrete liquid level monitoring.

Conclusions:

  • The proposed no-core fiber MMI sensor provides an inexpensive and simple solution for liquid level detection.
  • The sensor offers versatile applications, including multiplexing and refractive index sensing.
  • This technology presents a significant advancement in cost-effective optical sensing.