A metrology system is presented that measures internal three-dimensional (3-D) displacement fields. The system uses a stereo pair of flash x-ray heads and correlation analysis to measure the true deformation of a layer of x-ray-absorbent particles inside the specimen. The 3-D deformation field inside blocks of polyester was determined. The polyester blocks were impacted by a 9-mm steel ball bearing fired from a 9-mm-bore gas gun at a speed of 373.5 ± 3.0 m s~(-1). At a given time aiter impact, a short-duration (30 ns) flash x-ray pulse exposes the x-ray'radiographs and freezes the events during impact. Thereafter, the x-ray radiographs are scanned into a personal computer and analyzed as in digital speckle photography.
展开▼
机译：提出了一种测量内部三维（3-D）位移场的计量系统。该系统使用一对立体的闪光X射线头和相关分析来测量样品内部X射线吸收颗粒层的真实变形。确定了聚酯内部嵌段的3-D变形场。聚酯块受到9毫米钢球轴承的撞击，该轴承由9毫米口径的气枪发射，速度为373.5±3.0 m s〜（-1）。在给定的时间撞击中，短时（30 ns）的闪光X射线脉冲会暴露X射线照相，并冻结撞击过程中的事件。此后，将X射线射线照片扫描到个人计算机中，并像数字散斑摄影一样进行分析。
展开▼
