Electrical Resistance Tomographic Image Synthesis Andanalysis Based On OpenGL

With the development of science and technology, the request for high resolution ERT images is often raised to measure two-phase flows. Practically, information carried in a three dimensional space of a two-phase flow can be generally used to evaluate the process model performance of a two phase flow and the spatial distribution of various static and/or dynamic properties associated with the flow. Based on the OpenGL and Visual C++, this paper aims at presenting a technique by which one can reconstruct a 3D volume by stacking a sequence of 2D images, or conversely obtain a desired 2D image by slicing a 3D volume.The main contents of this paper are as follows:1. Reviewed the development process and present status of the research on ERT, and summed up the ERT system structure, working way, technique character, future development prospect and so on.2. Analyzed the partition of finite element mesh and calculated the coordinates of each node for traditional two-dimensional images of ERT system. We constructed the three-dimensional model with Visual C++ and OpenGL, using gray scaled or color mapped coloring at any specified viewing angles.3. To enable us to get more information of two-phase flow on different sliced images obtained from a 3D ERT tomogram, we can control the viewing angle and slice the original 3D tomogram at a arbitrary direction or radial depth, depending on the requirements. This may help us observe the distribution and the dynamic changes of a two-phase flow. The work discussed in the paper will provide a good foundation to the comprehensive measurement, visual display and analysis of the performance of a three-dimensional based ERT system.