EGA Evolved Gas Analysis – In-Situ

Evolved Gas Analysis – In-Situ (EGA)


On point

Possible Techniques:

  •  FTIR (Fourier Transform Infrared Spectroscopy):   – This technique enables the measurement of basic and trace gas components, reaching down to the ppm (parts per million) range. It’s particularly effective for polar molecules like H2O, CO2, CO, H2S, and more.
  • Raman Spectroscopy: Raman spectroscopy is used for the measurement of basic gas components, and it’s not limited to polar molecules. Even non-polar molecules like H2 or N2 can be effectively measured using this method.
  • ELIF (Excimer Laser-Induced Fragmentation Fluorescence): – ELIF is a UV laser-based method designed for the measurement of gaseous alkaline compounds, including NaCl, NaOH, KCl, KOH. It’s worth noting that this technique can also operate at 193 nm, allowing entry through UV sapphire for specialized applications.

Advantages of the optical In-Situ window:

  • Unaltered Measuring Gas: The system does not introduce any cooling or modifications to the measuring gas. This means there’s no risk of out-condensation, transition reactions, or equilibrium shifts, ensuring accurate measurements.

  • High-Temperature Compatibility: The method is suitable for analyzing many materials with high condensation temperatures, such as alkali metals like Na and K, and their combinations. Unlike heated capillaries, which are limited to around 200-250°C, the optical port allows measurements to be conducted at much higher temperatures, reaching up to 1600°C.

  • Non-Invasive Approach: The system operates without the need for intervention into the measuring system, even when gas is drawn by vacuum. This non-invasive quality is crucial for maintaining the integrity of the measurements.

  • Gas Purity Maintained: Importantly, there is no risk of contaminating the measuring gas within the capillary, whether for Mass Spectrometry (M/S) or Fourier Transform Infrared Spectroscopy (FTIR) analysis.

  • Real-Time Online Measurement: The system enables real-time online measurements, eliminating any dead time as the measuring volume enters the instrument. This ensures timely and continuous data acquisition.

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