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Related Experiment Video

Updated: May 23, 2026

Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

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A self-referencing intensity based polymer optical fiber sensor for liquid detection.

David Sánchez Montero1, Carmen Vázquez, Ingo Möllers

  • 1Departamento de Tecnología Electrónica, Universidad Carlos III de Madrid, Leganés, 28911, Madrid, Spain; E-Mail: cvazquez@ing.uc3m.es (C.V.).

Sensors (Basel, Switzerland)
|March 29, 2012
PubMed
Summary
This summary is machine-generated.

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A new fiber optic sensor detects liquids by measuring changes in a polymer optical fiber (POF) coupler. This intrinsically safe technology is ideal for monitoring liquids in hazardous industrial environments.

Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Materials Science

Background:

  • Fiber optic sensors offer advantages in hazardous environments.
  • Liquid detection is crucial in various industrial applications, especially in flammable atmospheres.
  • Existing methods may have limitations in safety or specificity.

Purpose of the Study:

  • To present a novel self-referencing fiber optic intensity sensor.
  • To demonstrate the sensor's capability for liquid detection and differentiation.
  • To evaluate the sensor's performance under different conditions.

Main Methods:

  • Utilizing a partially polished polymer optical fiber (POF) coupler.
  • Measuring bending losses and the resulting coupling ratio (K).
Keywords:
POF couplerbending lossesintensity-based optical sensorliquid levelpolymer optical fiber

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Last Updated: May 23, 2026

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  • Immersing the sensor in various liquids (water, oil) and testing temperature dependence (25°C to 50°C).

    • Main Results:

    • The coupling ratio (K) is sensitive to the external liquid environment.
    • The sensor can distinguish between different liquids like water and oil.
    • K values showed an increase up to 10% depending on the liquid, with minimal temperature effects.

    Conclusions:

    • The developed POF sensor is effective for liquid detection and identification.
    • Its self-referencing nature and intrinsic safety make it suitable for flammable atmospheres.
    • This technology offers a promising solution for liquid level measurements in demanding industrial settings.