Prof. Thomas Seeger Profile

Prof. Thomas Seeger

at Univ Siegen

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Proceedings Article | 1 June 2011 Paper

Gas-phase diagnostic by time-resolved rotational coherent anti-Stokes Raman spectroscopy

Thomas Seeger, A. Leipertz

Proceedings Volume 8069, 80690Y (2011) https://doi.org/10.1117/12.887320

KEYWORDS: Polarization, Raman spectroscopy, Combustion, Stray light, Picosecond phenomena, Molecules, Signal processing, Nd:YAG lasers, Diagnostics, Diffusion

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Dual-broadband pure rotational CARS (RCARS) is nowadays a well-developed gas phase measurement technique. Nevertheless there are challenges for technical applications due to stray light interference, soot emission or droplets. Beside this for diffusion flames also a strong, unknown and varying non-resonant background signal is contributing to the CARS signal. Possible applications of time-resolved pure rotational coherent anti-Stokes Raman spectroscopy for different applications are demonstrated and its potential of for gas-phase thermometry is investigated. The field of application covers studies on flame research especially sooting flames as well as its use in technical combustion systems e.g., for the determination of the gas-phase temperature in the vaporizing spray of a GDI injector. A new advantageous approach by using picosecond (ps) laser sources as a diagnostic tool is also demonstrated. By time-delaying the ps probe laser beam problems due to stray light interference, soot emission or droplets can be reduced tremendously of even eliminated.

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