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Updated: May 21, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Ultrahigh-sensitivity temperature fiber sensor based on multimode interference.

Susana Silva1, Edwin G P Pachon, Marcos A R Franco

  • 1Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas–UNICAMP, Campinas, São Paulo, Brazil.

Applied Optics
|June 15, 2012
PubMed
Summary
This summary is machine-generated.

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A novel fiber optic sensor using a coreless multimode fiber (MMF) shows ultrahigh sensitivity to liquid refractive index and temperature changes. This self-imaging effect sensor offers over 100-fold improvement compared to existing devices.

Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Nanomaterials

Background:

  • Single-mode-multimode-single-mode (SMS) fiber structures leverage the self-imaging effect.
  • Coreless multimode fibers (MMF) offer unique properties for evanescent wave sensing.
  • Sensitivity to external refractive index (RI) and temperature is crucial for sensor applications.

Purpose of the Study:

  • To propose and analyze a novel fiber optic sensing device based on the self-imaging effect in a coreless MMF.
  • To investigate the influence of coreless MMF diameter on sensitivity to external RI variations.
  • To evaluate the sensor's performance for detecting temperature variations in liquids with high RI.

Main Methods:

  • Fabrication of a single-mode-multimode-single-mode (SMS) fiber structure incorporating a coreless MMF section.

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  • Experimental measurement of sensor response to external refractive index (RI) variations.
  • Experimental measurement of sensor response to temperature variations in liquids with RI ~1.43.
  • Numerical analysis of an evanescent wave absorption sensor model with polymer coating.

    • Main Results:

    • The lowest coreless MMF diameter (55 μm) yielded maximum sensitivity of 2800 nm/RIU.
    • Ultrahigh sensitivity to temperature variations in liquid RI (1.43) reached -1880 pm/°C, over 100-fold higher than typical values.
    • Numerical analysis demonstrated potential for extending detectable RI range above 1.43 using polymer coatings.

    Conclusions:

    • The proposed SMS fiber sensor utilizing a coreless MMF exhibits exceptional sensitivity to RI and temperature.
    • The sensor design, particularly the coreless MMF diameter, is critical for optimizing sensing performance.
    • This technology holds promise for advanced liquid sensing applications requiring high sensitivity and extended RI detection ranges.