Temperature retrieval error in Rayleigh-Brillouin scattering using Tenti’s S6 kinetic model

Wu, Lei and Reese, Jason M. and Zhang, Yonghao (2016) Temperature retrieval error in Rayleigh-Brillouin scattering using Tenti’s S6 kinetic model. In: 30th International Symposium on Rarefied Gas Dynamics. AIP Conference Proceedings, 1786 . AIP Publishing, CAN. ISBN 9780735414488

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    Abstract

    The Rayleigh-Brillouin spectrum of light scattered by gas density fluctuations contains information about the gas temperature. This information can be retrieved by comparing experimentally measured spectra with theoretical line shapes determined from the linearized Boltzmann equation. However, the linearized Boltzmann equation is difficult to solve so Tenti's S6 kinetic model has been widely used for several decades because of its simplicity. In this paper, the linearized Boltzmann equation is solved by the efficient fast spectral method, and the temperature retrieval error associated with the Tenti's S6 model is systematically investigated for both spontaneous and coherent Rayleigh-Brillouin scattering, for different gas rarefaction and intermolecular potentials. Our results indicate useful calibrations for laser technologies that use Rayleigh-Brillouin scattering to profile for gas temperatures with high accuracy.