Planar thermometry using the method of spontaneous Raman scattering with structured laser illumination
D.K. Sharaborin
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: structured laser radiation, spontaneous Raman scattering, swirling flames
Abstract
A method based on registering the distribution of spontaneous Raman scattering (SRS) intensity using structured laser radiation was employed to visualize and estimate the local distribution of temperature in pre-mixed laminar and turbulent methane-air flames. A comparison with the distributions of temperature measured by the Raman scattering method without modulated laser radiation is given. In the direction across the laser sheet in the measurement plane, the spatial resolution for the data with structured radiation proved to be lower than the spatial resolution for the data obtained without using structured radiation. However, even with the indicated disadvantages, the implemented approach makes it possible to estimate the average distribution of temperature in the reacting flow using the Raman signal recorded only with S-polarized laser radiation.
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