Characterization of gas phase temperatures in dependence of particle presence in the flame spray pyrolysis process

We introduce a novel strategy to acquire gas phase temperatures by O₂ pure rotational CARS during flame spray pyrolysis (FSP) for silica production. RCARS benefits from a polarization filtering technique that is essential in particle and droplet environments. Particle containing regions were located by correlating laser-induced breakdown (LIB) in a particle-laden and a particle-free flame at different heights. Measured temperatures in the particle regime show significantly lower flame temperatures for particle-laden flames since energy is dissipated rapidly by radiation heat transfer in the presence of particles.