EGA – Optical In-Situ Evolved Gas Analysis

Possible Techniques:

• FTIR: Fourier Transform Infrared Spectroscopy
• Measurement of basic and trace gas components until ppm range, 
• (for example H2O, CO2, CO, H2S……)
• Polar Molecules are necessary
• Raman-Spectroscopy:
• Measurement of basic gas components
• Also non polar molecules like H2 or N2 measurable
• ELIF: Excimer Laser induced Fragmentation Fluorescence
• UV-Laser-based Method of Measuring of gaseous alkaline compounds (for example NaCI, NaOH, KCI, KOH)
• Also at 193 nm a entry through UV_saphire is possible

Advantages of the optical In-Situ window:

• No Cooling / Modification of the measuring gas (for example no out-condensation, no transition reaction, no equilibrium shift) many materials with high condensation temperature for example alkali metals (Na, K and their combinations) are now able to be measured, heated capillary only suitable for some 200 – 250°C, the optical port allows measurement until 1600°C
• No intervention into the measuring system (for example when pulling gas by vacuum)
• No contamination of the measuring gas in the capillary to M/S or FTIR
• Real-time online-Measurement (no dead time until measuring volume enters the measuring instrument