数字激光高速摄影系统及其在爆炸光测力学实验中的应用

Digital Laser High-speed Photography System and Its Application in Photomechanical Tests with Blast Loading

为解决爆炸光测力学中的高速数据采集问题,建立了基于泵浦激光器和Fastcam-SA5数字高速相机的数字激光高速摄影系统,并应用于爆炸载荷下的焦散线实验、光弹性实验和纹影实验。结果显示,该数字激光高速摄影系统真实记录了爆生裂纹扩展情景、裂纹尖端焦散斑、光弹模型试件表面等差线条纹,以及切缝药包产生的冲击波在空气中的传播过程;清晰的数字照片验证了该数字激光高速摄影系统的可行性和先进性,实现了"一套系统,多种实验",丰富了爆炸光测力学的测试手段及应用范围。

For the high speed data acquisition in photomechanical tests with blast loading, a digital laser high-speed photography system consisting of a pumped laser and the Fastcam-SA5 digital high-speed camera is built and applied to the caustics, the photoelasticity, and the schlieren experiments, combining with a blast loading setup. It is shown that the images of the caustics at the running crack tip, the arithmetic line stripes on the surface of photoelastic model specimens, and the propagation process of the blasting wave in the air from charging with slots are recorded clearly, indicating that the new digital laser high-speed photography system is reliable. Also the concept of ＂one system, various experiments＂ is realized, which provides some new testing methods and new application fields in blasting mechanics.