Sensitivity Matrix for Composite Materials Nondestructive Detection Based on Planar ECT
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摘要: 提出了一种用于热防护材料无损检测的平面阵列电容层析成像（ECT）传感方法，该方法能在有限的接近范围内检测目标对象。研究了一种12电极平面的ECT系统，并利用ANSYS软件建立了仿真模型。在图像重建的过程中，灵敏度矩阵是必不可少的。为了优化灵敏度矩阵，讨论了敏感场介电常数和重建图像切片层的影响。试验结果表明，不同切片层的重建图像差异较大，第二层图像质量最高，而介电常数的变化对检测结果影响不大。Abstract: A promising method of planar array electrical capacitance tomography(ECT) for thermal protection materials nondestructive detection is presented. This method can detect targeted object only from a limited access. In this study, a planar ECT system with 12 electrodes has been developed for experiment and its simulation model also has been built by using ANSYS. The sensitivity matrix is essential and fundamental in the process of image reconstruction. To optimize the sensitivity matrix, the influences of permittivity of sensitive filed and selection of section for reconstruction image have been discussed. The experimental results show that there exist great differences in reconstruction images for different sections and the image quality of the second layer is the highest, whereas the change of permittivity has little influence on detection results.
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Keywords:
- planar array /
- ECT /
- thermal protection /
- nondestructive detection /
- sensitivity matrix
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