In Situ High-Temperature Raman Spectroscopy via a Remote Fiber-Optic Raman Probe

This study demonstrated for the first time an in situ high-temperature fiber-optic Raman probe to study the structure of glass and slag samples at temperatures up to 1400 °C. A customized external telescope was integrated into a portable fiber-optic Raman probe to extend the optical working distance to allow the probe to work in a high-temperature environment. Three samples were evaluated to demonstrate the functionality of the high-temperature fiber-optic Raman probe. Room temperature and high-temperature Raman spectra were successfully collected and analyzed. In addition, a deconvolution algorithm was used to identify peaks in the spectrum that could then be related to the molecular structure of components in each sample. This flexible and reliable high-temperature Raman measurement method has great potential for various applications, such as materials development, composition, and structure monitoring during high-temperature processing, chemical identification, and process monitoring in industrial production.