固体火箭发动机缺陷的ICT局部检测

为了实现对固体火箭发动机缺陷的局部检测,提出了窄角扇束工业计算机断层扫描成像(ICT)检测固体火箭发动机缺陷的局部检测方案.采用平移/旋转扫描方式和只旋转扫描方式对固体火箭发动机缺陷进行局部检测.为了验证局部检测方案的有效性,利用窄角扇束ICT对某型固体火箭发动机进行局部检测,并利用卷积反投影算法和小波变换算法进行局部重建.结果表明:平移/旋转扫描方式适合窄角扇束ICT对固体火箭发动机缺陷进行局部检测,只旋转扫描方式不适合局部检测.由于利用局部缺陷区域外的投影数据,卷积反投影算法较小波变换算法的局部重建质量高.这对于提高固体火箭发动机缺陷的检测效率,降低检测成本具有重要意义.

ICT local inspection of solid rocket motor's defects

To inspect solid rocket motor's defects locally, local inspection scheme of solid rocket motor's defects was proposed for narrow fan-beam industrial computed tomography(ICT). Translation/rotation scan mode and rotation only scan mode were used to inspect solid rocket motor's defects locally. To demonstrate the effectiveness of local inspection scheme, narrow fan-beam ICT was used to inspect one solid rocket motor locally. Convolution backprojection algorithm and wavelet transform algorithm were applied to reconstruct ICT images locally. Results show that translation/rotation scan mode is effective for narrow fan-beam ICT to inspect solid rocket motor's defects locally, rotation only scan mode is not effective. For using projections outside the local defect area, the reconstructed image quality of convolution backprojection algorithm is better than that of wavelet transform algorithm. It is of great significance for improving the inspection efficiency of solid rocket motor's defects and for reducing the inspection cost.