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Rushton搅拌釜气含率分布CT彩色数字成像模型研究

DOI: doi:10.3969/j.issn.1006-7043.2011.10.020

Keywords: γ射线CT, 气含率分布, 彩色数字成像, 数学模型, Rushton气液搅拌釜??

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Abstract:

为了建立和实现137Cs γ射线CT(computed tomography)测量Rushton气液搅拌釜气含率分布彩色数字成像模型,根据137Cs发射γ射线信号和探测器接受信号的Poisson分布模型和气液两相流体吸收衰减辐射信号的二项分布模型,在给出接受信号实验样本空间条件下,采用最大似然参数估计法,对容器断面气液两相流体吸收衰减γ射线信号二维空间进行了参数估计,推导和建立了其参数估计的数学模型.在不同通气量、不同搅拌速率及不同气体分布器状态下,对Rushton气液搅拌釜断面气含率进行了CT实验测定、数据处理和图像重建.通过对CT彩色数字图像与平均气含率沿无因次半径变化实验值的比较研究,证明所构建的CT测量气含率分布彩色数字成像的模型有效可行,所重建的CT彩色数字图像清晰准确、对比度好、分辨率高、受噪声影响小.

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