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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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A refractive index sensor based on the resonant coupling to cladding modes in a fiber loop.

Mauricio Reyes1, David Monzón-Hernández, Alejandro Martínez-Ríos

  • 1Departamento de Física Aplicada, Instituto de Ciencia de los Materiales, Universidad de Valencia, Burjassot 46100, Spain. Mauricio.Reyes@uv.es

Sensors (Basel, Switzerland)
|August 28, 2013
PubMed
Summary

We developed a simple, inexpensive optical fiber sensor for measuring refractive index. This compact device uses a bent fiber loop to detect changes in liquids, offering high sensitivity and resolution for various applications.

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Area of Science:

  • Photonics and optical sensing
  • Materials science and engineering

Background:

  • Optical fiber sensors offer non-destructive and remote sensing capabilities.
  • Refractive index sensing is crucial for chemical analysis, process monitoring, and biomedical applications.

Purpose of the Study:

  • To develop and characterize a low-cost, compact optical fiber sensor for measuring refractive index.
  • To investigate the sensing mechanism based on resonant coupling in a bent fiber loop.
  • To demonstrate the sensor's sensitivity and resolution for different refractive index ranges.

Main Methods:

  • Fabrication of a single fiber loop with adjustable diameter.
  • Analysis of transmission spectra to identify notch wavelengths.
  • Characterization of notch wavelength shifts in response to external medium refractive index changes.
  • Calculation of sensor sensitivity and resolution.

Main Results:

  • The sensor exhibits transmission spectra with notches due to resonant coupling between fundamental and cladding modes.
  • Notch wavelengths, tunable by loop diameter, shift with external refractive index.
  • Demonstrated sensitivities of 170 nm/RIU for water solutions and 800 nm/RIU for n=1.40-1.442.
  • Achieved long-range resolution of 3 × 10⁻⁴ and short-range resolution of 2 × 10⁻⁵ for water solutions.

Conclusions:

  • The proposed optical fiber loop sensor is a cost-effective and easy-to-build device for refractive index sensing.
  • The sensor's performance, including tunable wavelength and high sensitivity, makes it suitable for various applications.
  • This technology offers a promising alternative for real-time refractive index monitoring in diverse fields.