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Related Experiment Video

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
08:12

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Published on: March 13, 2013

Gas refractometry based on an all-fiber spatial optical filter.

Susana Silva1, L Coelho, R M André

  • 1INESC Porto, Porto, Portugal.

Optics Letters
|February 6, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel optical fiber sensor for gas refractometry. The device utilizes splice misalignment to create a spatial filter highly sensitive to refractive index changes in nitrogen gas.

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Area of Science:

  • Optoelectronics
  • Fiber Optics Sensors
  • Gas Sensing

Background:

  • Optical fiber sensors offer high sensitivity and remote sensing capabilities.
  • Gas refractometry requires precise measurement of gas refractive index for analysis.

Purpose of the Study:

  • To propose and demonstrate a novel spatial optical filter for gas refractometry.
  • To investigate the sensor's performance in detecting refractive index changes in a nitrogen environment.

Main Methods:

  • Fabrication of a sensing head using splice misalignment between optical fibers of different diameters (50 μm and SMF28).
  • Interrogation of the sensing head in transmission to observe spectral responses (bandpass/band-rejection filters).
  • Systematic variation of nitrogen gas pressure to induce refractive index changes.

Main Results:

  • The proposed device exhibits Fabry-Perot behavior due to misalignment.
  • Achieved a maximum sensitivity of -1390 nm/RIU for the bandpass filter configuration.
  • Demonstrated similar temperature responses for both filter types with an average sensitivity of 25.7 pm/°C.

Conclusions:

  • The spatial optical filter based on splice misalignment is effective for gas refractometry.
  • The sensor shows high sensitivity to refractive index variations in nitrogen gas.
  • The device offers a promising approach for gas sensing applications.