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Gas Chromatography: Types of Detectors-II01:19

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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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Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
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There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Highly efficient and selective integrated directional couplers for multigas sensing applications.

Ajmal Thottoli1, Gabriele Biagi2,3, Artem S Vorobev4,2,5

  • 1Department of Electrical and Information Engineering, Politecnico di Bari, 70126, Bari, Italy. ajmal.thottoli@poliba.it.

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Summary

We developed a compact, low-loss directional coupler duplexer for near-infrared wavelengths. This device enables sensitive, drone-based multi-gas detection of ammonia and methane using techniques like QEPAS.

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Area of Science:

  • Photonics and Optical Engineering
  • Gas Sensing Technologies

Background:

  • Directional couplers (DCs) are crucial optical components.
  • Near-infrared (NIR) spectroscopy offers high sensitivity for gas detection.
  • Existing methods for multi-gas detection can be bulky and less portable.

Purpose of the Study:

  • To design and fabricate a compact, low-loss, broadband directional coupler (DC) based duplexer.
  • To achieve high selectivity and coupling efficiency (CE) for specific NIR wavelengths.
  • To enable portable, sensitive multi-gas detection for applications like ammonia and methane sensing.

Main Methods:

  • Fabrication of a novel directional coupler (DC) based duplexer.
  • Characterization of the duplexer's performance at target NIR wavelengths (1530 nm and 1653.7 nm).
  • Evaluation of coupling efficiency (CE) and selectivity.

Main Results:

  • Demonstrated a compact, low-loss, broadband directional coupler (DC) duplexer.
  • Achieved high coupling efficiency (CE) of 73% at 1530 nm and 76% at 1653.7 nm.
  • Confirmed applicability for multi-gas detection of ammonia and methane.

Conclusions:

  • The developed duplexer is effective for highly sensitive sensing techniques like quartz-enhanced photoacoustic spectroscopy (QEPAS).
  • Its compact and low-loss design facilitates portable, drone-based gas detection.
  • The broadband and scalable nature of the duplexer supports versatile sensing applications.