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International Society for Industrial Process Tomography

6th World Congress on Industrial Process Tomography

ERT Application Software for Multiphase Flow Measurement


Shangjie Ren, Chao Tan, Jun Han, Feng Dong


Tianjin Key Laboratory of Process Measurement and Control, School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China

Tel: 86­22­27890276, Fax: 86­22­27892055, Email: fdong@tju.edu.cn


ABSTRACT


Multiphase flow is commonly encountered and of paramount significance in both natural and industrial processes. Accurate measurement on its process parameters is difficult to achieve due to its rheological complexity. It has become an urgent issue to scientific researchers and industrial engineers. ERT is a promising technology to measure the multiphase flow due to its capability of producing two/three dimensional real­time information related to interior behaviours of medium within the closed process equipments, such as close pipes, vessels and so on. In this paper, an ERT application software for the measurement of multiphase flow is presented. It works with a high speed data acquisition system, which is based on CompactPCI and a 16­channel parallel digital data acquisition strategy. To improve the speed and accuracy of online measurement, some techniques have been implemented in this software, such as modularized software structure, multithreading technology, multiprocessing technology, and Open Graphics Library. Additional, a DMA data transmission strategy based on CompactPCI communication protocol is developed and implemented in this software. It makes this system more conform to the industry­standard and the data transmission speed been improved greatly. This software is capable of acquiring 1400 frames data per second and reconstructing cross­section images at a rate of 60 frames per second on a Windows based PC with a 1.8GHz Pentium Dual CPU, while saving measurement results and extracting flow parameters synchronously.


Keywords Electrical resistance tomography; Multiphase flow measurement; DMA; CompactPCI; Open Graphics Library; Visual C++


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