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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Monitoring the Wobbe Index of Natural Gas Using Fiber-Enhanced Raman Spectroscopy.

Vincenz Sandfort1, Barbara M Trabold2, Amir Abdolvand2,3

  • 1Laboratory for Gas Sensors, Department of Microsystems Engineering–IMTEK, University of Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany

Sensors (Basel, Switzerland)
|December 1, 2017
PubMed
Summary

Kagomé-style photonic crystal fiber (PCF) enables faster and more comprehensive natural gas analysis. This fiber optic technology improves detection limits for real-world applications, enhancing natural gas quality assessment.

Keywords:
Raman spectroscopyfiber enhancedkagoménatural gasphotonic crystal fiberwobbe index

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Area of Science:

  • Spectroscopy
  • Materials Science
  • Analytical Chemistry

Background:

  • Accurate natural gas composition analysis requires simultaneous quantification of multiple components.
  • Fiber-enhanced Raman spectroscopy (FERS) offers a single-measurement solution but faces challenges like detection limits and background noise.
  • Hollow-core photonic crystal fibers (PCFs) are investigated for improved FERS performance.

Purpose of the Study:

  • To compare the performance of two PCF types: photonic bandgap PCF and kagomé-style PCF.
  • To assess their suitability for online determination of the Wobbe index.
  • To overcome practical limitations of FERS for real-world natural gas analysis.

Main Methods:

  • Utilized fiber-enhanced Raman spectroscopy with two distinct hollow-core PCF types.
  • Investigated detection limits and background Raman signals for each fiber.
  • Evaluated the capability for simultaneous quantification of natural gas components.

Main Results:

  • Kagomé-style PCF demonstrated superior performance compared to bandgap PCF.
  • Reliable detection of Raman-scattered photons below 1200 cm-1 was achieved with kagomé-style PCF.
  • Bandgap PCF exhibited limitations in detecting low-frequency Raman signals.

Conclusions:

  • Kagomé-style PCF significantly enhances the potential for fast and comprehensive natural gas quality assessment.
  • This fiber type overcomes key obstacles in FERS, enabling reliable online determination of the Wobbe index.
  • The findings pave the way for more efficient and accurate natural gas analysis in industrial settings.