Molecular filtered Rayleigh scattering diagnostic for measurement of temperature and density in flame

Molecular filtered Rayleigh scattering(FRS) is an optical technique that utilizes the light scattering by atoms/molecules to allow the computation of thermodynamic properties and velocity in flow fields. The main components of diagnostics system are a narrow line-width laser, a molecular/atomic absorption filter and a collecting device such as ICCD, which can be used to suppress background surface/particle scattering and enhance flow visualization. In this paper, FRS working principle, the FRS diagnostic system and the iodine filter cell are described. On the basis of diagnosing FRS image and measuring iodine vapor absorption spectrum, methane/air premixed flame is diagnosed and the 2-dimension temperature and density fields are obtained. The temperature measured is compared with the resul