摘要
从型芯影像射线照相对比度的角度分析了残芯在叶片中的可检性。通过推导的残芯影像对比度公式,分析了影像对比度的各种影响因素,并在理论上进行了计算。从试验与理论计算相比较的结果表明,通过改善梯度和散射能有效地提高型芯影像的对比度。得出型芯在叶片材料上的最小可检厚度。
The paper aimed to evaluate whether the residual ceramic core in a hollow blade could be found through analyzing the residual ceramic core＇s image of radiographic contrast. Moreover, it analyzed some important influence factors of imaging contrast which could be educed from the formula of image＇s radiographic contrast. Forthermore, some values under certain energy were also calculated through the formula. In addition, through comparing the results of experiment with the calculating results according to the formula, it was shown that the image contrast could be increased efficiently by improving the grads of film and the scattering ratio of X-ray. Finally, the minimum ceramic core＇s thickness which could be tested on the material of blades was also acquired.
出处
《无损检测》
2009年第7期544-547,共4页
Nondestructive Testing
关键词
空心叶片
残留型芯
射线检测
影像对比度
散射比
Hollow blade
Residual ceramic core
Radiographic testing
Image contrast
Scattering ratio
