SCATTERING TOMOGRAPHY AND ITS APPLICATION TO SOOTING DIFFUSION FLAMES

A new analytical tomographic reconstruction technique was developed fo r the determination of the extinction and scattering coefficient distr ibutions in axisymmetric media. This method, called ''scattering tomog raphy,'' was tested for several particle concentration profiles corres ponding to those for diffusion flames. After that, a series of experim ents were performed on sooting acetylene flames using an argonion lase r nephelometer. The experimental results were reduced using both the t ransmission and scattering tomography techniques to obtain the extinct ion coefficient profiles. It was shown that in the center of the flame , the results from these two approaches were in good agreement. Scatte ring tomography can be used to determine both the absorption and scatt ering coefficient distributions in the medium. In addition to that, it is preferable over the transmission tomography if the medium is optic ally very thin and particles are predominantly scattering.