Temperature and gas concentration measurements with vibrational ultra‐broadband two‐beam femtosecond/picosecond coherent anti‐Stokes Raman scattering and spontaneous Raman scattering

• Published in: Journal of Raman spectroscopy Vol. 50; no. 9; pp. 1268 - 1275
• Main Authors: Ran, Yang, Junghanns, Marcus, Boden, André, Nolte, Stefan, Tünnermann, Andreas, Ackermann, Roland
• Format: Journal Article
• Language: English
• Published: Bognor Regis Wiley Subscription Services, Inc 01.09.2019
• Subjects: Broadband; Carbon dioxide; CARS; Coherent scattering; femtosecond; gas; Gas mixtures; Gasification; Raman spectra; Raman spectroscopy; Temperature distribution; Temperature effects; thermometry
• ISSN: 0377-0486; 1097-4555
• DOI: 10.1002/jrs.5661

In combustion and gasification diagnostics, the knowledge of temperature distribution and gas component concentration is crucial in order to understand or optimize such processes. In this study, we compare ultra‐broadband two‐beam femtosecond/picosecond coherent anti‐Stokes Raman scattering (fs/ps CARS) with spontaneous Raman scattering to retrieve temperature and concentration information. We show that two‐beam fs/ps CARS can be effectively used for concentration measurements down to 0.5% CO in gas mixtures of CO2 and N2. With two‐beam fs/ps CARS, thermometry from ~200°C to ~800°C based on CARS spectra of CO2 or H2 is shown. With spontaneous Raman scattering, concentration determination is well performed in gas mixtures of H2, N2, and CO2 with H2 content ranging from 16% to 0.5% at room temperature and from 16% to 7% H2 at ~900°C. Besides, thermometry in gas mixtures of N2 and CO2 from ~200°C to ~600°C based on spontaneous Raman scattering is also shown in this study. Gas phase temperature and concentration measurements are investigated and compared using vibrational ultra‐broadband two‐beam femtosecond/picosecond coherent anti‐Stokes Raman scattering (fs/ps CARS) and spontaneous Raman scattering. Thermometry up to ~800°C and concentration as low as 0.5 % CO/H2 based on both methods are shown. The results are discussed for conversion processes in gasification or combustion.