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Microstructured optical fiber interferometric breathing sensor.

Fernando C Favero1, Joel Villatoro, Valerio Pruneri

  • 1Pontifical Catholic University of Rio de Janeiro, Rua Marquês de São Vicente 225, 22453-900, Rio de Janeiro, Brazil.

Journal of Biomedical Optics
|April 17, 2012
PubMed
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A novel photonic crystal fiber (PCF) breathing sensor uses light interference to monitor respiration. This optical fiber sensor detects water molecules in exhaled air, offering a non-electronic alternative for health monitoring.

Area of Science:

  • Photonics
  • Optical Fiber Sensing
  • Biomedical Engineering

Background:

  • Traditional electronic sensors face limitations in certain environments.
  • Monitoring respiration is crucial for health evaluation and disease diagnosis.
  • Photonic crystal fibers (PCF) offer unique light manipulation properties.

Purpose of the Study:

  • To introduce a simple photonic crystal fiber (PCF) interferometric sensor for breathing monitoring.
  • To demonstrate the sensor's ability to detect changes in exhaled air.
  • To explore its potential applications in healthcare.

Main Methods:

  • Fabrication of a PCF interferometer by fusion splicing.
  • Excitation and recombination of core and cladding modes within the PCF.

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  • Analysis of spectral shifts in response to water molecule adsorption/desorption.

    • Main Results:

    • The PCF interferometer exhibited a sinusoidal interference pattern in its reflection spectrum.
    • The spectrum instantly shifted upon adsorption or desorption of water molecules from exhaled air.
    • The sensor effectively monitored breathing regardless of respiration rate.

    Conclusions:

    • A simple and effective PCF interferometric breathing sensor has been developed.
    • The sensor offers a non-electronic alternative for respiration monitoring.
    • Potential applications include health evaluation and diagnosis of conditions like sleep apnea syndrome.