Research on temperature measurement by spontaneous Rayleigh-Brillouin scattering profile

Chuanyin Yang; Tao Wu; Jingcheng Shang; Rongjing Hu; Xingdao He

doi:10.1117/12.2505397

12 December 2018 Research on temperature measurement by spontaneous Rayleigh-Brillouin scattering profile

Chuanyin Yang, Tao Wu, Jingcheng Shang, Rongjing Hu, Xingdao He

Proceedings Volume 10846, Optical Sensing and Imaging Technologies and Applications; 1084628 (2018) https://doi.org/10.1117/12.2505397
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China

Abstract

Rayleigh-Brillouin scattering is a promising remote diagnostic technique for the measurement of gas temperature in high pressure environments, such as the Space Shuttle Main Engine Pre-burner. In order to study the accuracy in temperature measurement of three theoretical models (Tenti S6 model, V3 model and G3 model), spontaneous Rayleigh-Brillouin scattering experiments in nitrogen (N₂) have been conducted at a wavelength of 532nm in the pressure range from 4 atm to 7atm with a temperature of 298K and a 93° scattering angle. The spontaneous Rayleigh-Brillouin scattering profile with high signal-to-noise ratio (SNR) is measured by scanning Fabry-Perot interferometer (FPI). By comparing the root-mean-square error of fitting residuals respectively for Tenti S6 model, V3 model and G3 model, it is found that V3 and G3 model have good fitting performance, while as for the processing data ability, the G3 model yield a fastest speed at only 0.09s. As for the measurement accuracy of the temperature retrieved from fitted data, it is found that the maximum absolute error for Tenti S6 model is at around 4K and those for V3 and G3 models are more than 10K, which means Tenti S6 model is most accurate in retrieving temperature. However, although there is a large error in measuring temperature with V3 and G3 models, this margin of error is allowed in the temperature measurement of the high-temperature tail flame of a pulsed detonation engine.

Citation Download Citation

Chuanyin Yang, Tao Wu, Jingcheng Shang, Rongjing Hu, and Xingdao He "Research on temperature measurement by spontaneous Rayleigh-Brillouin scattering profile", Proc. SPIE 10846, Optical Sensing and Imaging Technologies and Applications, 1084628 (12 December 2018); https://doi.org/10.1117/12.2505397

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