3d flame measurements using tomography reconstruction integrating view registration

3D (three dimensional) flame measurements based on tomography consist of two steps: view registration (VR) to determine the orientations of the projections, and the subsequent tomography reconstruction. The practical errors in both steps affect the overall accuracy of the 3D flame measurements. Past work treated these two steps separately. This work described a method to treat both steps holistically, applied the new method to 3D flame measurements, and demonstrated that the new method can substantially improve the overall accuracy. Such accuracy improvement was achieved because considering these two steps holistically establishes a feedback mechanism between the VR and tomography step, so that each step can leverage the information from the other step. In the application to 3D measurements on highly turbulent flames, the new method was quantitatively examined by simultaneously performing a well-established planar measurement as a benchmark, and was demonstrated to reduce the measurement error by ~48% on average in terms of the overall reconstruction error when compared to past methods that treated VR and tomography separately. © 2020, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.