| 空心叶片残留型芯影像的射线照相对比度 |
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| 引用本文： | 郭广平,;凌海军,;刘庆珍,;任吉林. 空心叶片残留型芯影像的射线照相对比度[J]. 无损检测, 2009, 0(7): 544-547 |
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| 作者姓名： | 郭广平, 凌海军, 刘庆珍, 任吉林 |
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| 作者单位： | [1]南昌航空大学无损检测技术教育部重点实验室,南昌330063; [2]北京航空材料研究院,北京100095 |
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| 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。
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| 关 键 词： | 空心叶片 残留型芯 射线检测 影像对比度 散射比 |
The Radiographic Image Contrast of Residual Ceramic Cores in Hollow Blades |
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| Affiliation: | GUO Guang-Ping, LING Hai-Jun, LIU Qing-Zhen, REN Ji-Lin(1. Ministry of Education Key Laboratory on Nondestructive Test, Nanehang HangKong University, Nanchang 330063, China; 2. Beijing Institute of Aeronautical Materials, Beijing 100095, China ) |
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| Abstract: | 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. |
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| Keywords: | Hollow blade Residual ceramic core Radiographic testing Image contrast Scattering ratio |
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