Effect of scanning voltage and scattered ray correction on the bladeboundary extraction of 3D industrial CT images
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摘要: 为实现航空发动机叶片壁厚的自动测量，提高航空发动机叶片的测量效率及准确性，在不同电压下对航空发动机叶片进行三维锥束CT（电子计算机断层扫描）成像试验，对获取的三维CT体数据进行了表面测定，同时，比较了400 kV和430 kV下散射线校正与未校正的边界，并对2组经过散射线校正后的数据进行标准量块（嵌入叶片中的）提取边界测量验证。研究表明，采用400 kV和430 kV的电压并经过散射线校正后的2组CT数据都可以提取完整清晰的叶片边界，测量结果与实际值较为接近，论证了通过提取边界对叶片进行测量的方法可以实现叶片壁厚测量的自动化。Abstract: In order to explore the automatic measurement of aero-engine blade wall thickness and improve the measurement efficiency and accuracy of aero-engine blades, a 3D cone beam CT (computed tomography) test was performed under different voltages. The 3D CT volume obtained under various voltages was tested. The boundary of the scatter-ray correction and uncorrected scatter-ray at 400 kV and 430 kV was compared, and the extraction boundary of the standard gauge block embedded in the two sets of corrected leaves was also measured. The results show that both CT images tested under 400 kV and 430 kV voltages can extract the blade boundaries clearly, which is relatively close to the actual data.It is demonstrated that the automation measurement of blade can be realized by measuring the blade boundary.
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Keywords:
- industrial CT /
- boundary extraction /
- blade /
- wall thickness measurement
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