共查询到15条相似文献,搜索用时 93 毫秒
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本文较系统地介绍了电容层析成像系统结构原理,包括抗杂散电容影响的微小检测技术,并行数据采集与处理单元设计以及基于总变差正则化的图像重建算法.与此同时,结合研制的双截面电容成像系统进行试验研究,结果表明该系统不仅可给出实时流型识别,同时能输出表征的特征参数. 相似文献
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两相流电容层析成像系统 总被引:1,自引:0,他引:1
本文较系统地介绍了电容层析成像系统结构原理,包括抗杂散电容影响的微小检测技术,并行数据采集与处理单元设计以及基于总变差正则化的图像重建算法.与此同时,结合研制的双截面电容成像系统进行试验研究,结果表明该系统不仅可给出实时流型识别,同时能输出表征的特征参数. 相似文献
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提出了基于小波变换的电容层析成像重建图像融合方法。首先,使用共轭梯度最小二乘法算法及Landweber迭代算法分别进行图像重建;其次,将所得重建图像进行小波分解,其近似分量按加权平均的融合规则进行处理,细节分量按绝对值最大融合规则进行处理;最后,将融合之后的数据进行小波重构,获得新的重建图像。仿真及实验结果表明,融合后的重建图像精度有所提高、图像伪影明显减少。 相似文献
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进行了电容层析成像(ECT)三维图像重建的仿真研究。首先利用COMSOL软件对ECT传感器进行三维建模,基于其高精度的有限元求解,计算ECT的灵敏度矩阵;其次,基于Matlab软件实现了基于线性反投影(LBP)及Landweber迭代算法的ECT图像重建,并利用图像显示程序获得了三维重建图像;最后,对球体及圆柱体模型进行了三维ECT图像重建,获得了较好的重建结果。 相似文献
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通过观察、对比金相组织得出电磁搅拌制备ZLl02半固态浆料的最佳工艺。实验过程中选取3组实验温度;在各种温度条件下分别选取4组不同搅拌时间制备试样。通过观察金相组织,对比不同实验条件下α—Al晶粒的尺寸、形态、分布均匀程度得到最佳制备工艺:在590℃,电磁搅拌30min;树枝状α-Al全部打碎,形成蔷薇状晶粒,蔷薇状α-Al均匀比较分布。 相似文献
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Electrical Capacitance Volume Tomography 总被引:1,自引:0,他引:1
A dynamic volume imaging based on the principle of electrical capacitance tomography (ECT), namely, electrical capacitance volume tomography (ECVT), has been developed in this study. The technique generates, from the measured capacitance, a whole volumetric image of the region enclosed by the geometrically three-dimensional capacitance sensor. This development enables a real-time, 3-D imaging of a moving object or a real-time volume imaging (4-D) to be realized. Moreover, it allows total interrogation of the whole volume within the domain (vessel or conduit) of an arbitrary shape or geometry. The development of the ECVT imaging technique primarily encloses the 3-D capacitance sensor design and the volume image reconstruction technique. The electrical field variation in three-dimensional space forms a basis for volume imaging through different shapes and configurations of ECT sensor electrodes. The image reconstruction scheme is established by implementing the neural-network multicriterion optimization image reconstruction (NN-MOIRT), developed earlier by the authors for the 2-D ECT. The image reconstruction technique is modified by introducing into the algorithm a 3-D sensitivity matrix to replace the 2-D sensitivity matrix in conventional 2-D ECT, and providing additional network constraints including 3-to-2-D image matching function. The additional constraints further enhance the accuracy of the image reconstruction algorithm. The technique has been successfully verified over actual objects in the experimental conditions 相似文献
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