Diagnosis of Quasi-Static Evolution of Defects in Explosives Using X-Ray In-Line Phase-Contrast Imaging
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摘要: 由于炸药具有弱吸收特性，利用传统的X射线成像技术难以获得质量较好的图像，因而无法对炸药内部的微小缺陷进行诊断。为提高炸药的X射线成像质量，采用X射线同轴相衬成像方法，获得了不同压力作用下高聚物粘结炸药(PBX)内部缺陷的一系列X射线相衬图像，从中清楚地观察到炸药内部缺陷从无到有、从小到大的准静态扩展过程，为研究高能炸药的热点形成机制提供技术支持。Abstract: In order to improve the X-ray image quality of the explosive, we performed experiments in which a series of X-ray phase contrast images of the defects in polymer bonded explosive (PBX) under different pressures were obtained using the X-ray in-line phase contrast imaging technology.In the images obtained, we clearly observed the quasi-static evolution of the defects.The results show that this method can provide technical support for better understanding the hot-spot formation mechanism of the explosives and help to overcome the difficulty involved in obtaining a satisfactory image of the explosive with traditional X-ray radiography due to its weak absorption, and consequently diagnosing the tiny defects in explosives.
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Key words:
- X-ray /
- in-line phase-contrast imaging /
- polymer bonded explosive /
- defect /
- quasi-static
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图 3 X射线管的输出功率为4 W时所获得的JIMA分辨率测试图像
Figure 3. Images of the JIMA resolution test-pattern at 4 W of output power of X-ray tube
图 5 含气泡的PMMA样品的相衬图像与吸收图像对比
Figure 5. Comparison between absorbed and phase-contrast images of a PMMA sample with bubbles
图 7 炸药缺陷扩展过程的X射线同轴相衬图像
Figure 7. X-ray in-line phase-contrast images of the evolution of defects in the explosive
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