Research and application of multi sequences laser shadowgraph technique

Multi sequences laser shadowgraph technique has been developed for getting the pill pose and the debris cloud in the hypervelocity impact experiment.Double,four,and eight se-quences laser shadowgraph systems have been set up successively on the hypervelocity impact range at the base of the technique of multi-light source divided in space,polarization decomposi-tion,light angle magnification and compensated filter,etc.The noise of diffraction and interfer-ence with homochromy light has been resolved by using the techniques.The systems can get many images at different time in the hypervelocity variety process.When the least interval is 1μs,the time of exposure is 10ns and the image pixel is ten million.The systems were also used in the impact experiments.The multi sequences laser shadow images have been gotten at differ-ent conditions with the impact velocity from 2km/s to 7km/s,which describe the outline chan-ging process of the debris cloud.This technique meets the need of showing the flight attitude of projectile and debris cloud at low cost,and can be used to measure in the field of other hyperve-locity process as well as show the flow structure.