Species variation Rayleigh scattering

Assuming the laser intensity to be constant, variations in the Rayleigh scattered intensity are a result of both temperature and species variations. Hence, an unambiguous interpretation of the Rayleigh scattered intensity requires that experiments be contrived into one of three cases. These are ... 

Case 3 Both temperature and species variation - In this case, additional information is required. This could be obtained from another diagnostic or a mathematical model. Smith (10) used an extensive mathematical model of a laminar hydrogen diffusion flame to predict the species distribution throughout the flame having this, the temperature could be inferred from the Rayleigh scattering intensity. 

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