Abstract

This paper explores Rayleigh scattering thermometry via a wavelength of 355 nm through a unique measurement scheme. In this context, the $p$-polarization and $s$-polarization Rayleigh scattering of flame and air (as the temperature calibration reference) are measured. Subtraction of $p$-polarization Rayleigh scattering intensity from that of $s$-polarization is proposed to eliminate the background noise and fluorescence interference influence to reduce the temperature measurement uncertainties. To validate this method, the temperature field of $ {{\rm{CH}}_4}/{{\rm{N}}_2}/{{\rm{O}}_2} $ premixed flame at $ \phi = 0.78 $ on a McKenna burner is detected by this Rayleigh scattering thermometry, and the axial temperature profile is validated with the literature data. Within the region of interest domain ($ - 5\,\,{\rm{mm}}$ to 5 mm in the radial direction), an overall temperature measurement system precision of $ \pm 46.5\,\,{\rm{K}} $ is reported. The influence of both $ p $-polarization Rayleigh scattering and laser sheet inhomogeneity on the temperature measurement is further quantitatively studied. The measurement uncertainties relevant to laser energy variation and flame Rayleigh scattering cross-section variation due to temperature increase are specified as 1.4% and 2%–8%, respectively. Eventually, temperature measurements of single-shot images are attempted, and the large signal dynamic range (100–1000 [a.u.]) indicates a promising potential for temperature field interpretation of turbulence combustion.

© 2019 Optical Society of America

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