Free-surface velocity measurements using an optically recording velocity interferometer

摘要

An optically recording velocity interferometer system (ORVIS) was developed for the free-surface velocity measurements in the equation of state experiments. The time history of free-surface velocity and the particle velocity in laser deduced Shockwaves experiments can be recorded by the electronic streak camera in ORVIS. The interference fringe shifts recorded by the ORVIS is proportional to the Doppler shift of a laser beam induced by being reflected from the back suface of the monitored target. In the experiments, ORVIS got an 179 ps time resolution, and a higher time resolution could be got by minimizing the delay time. The equation of state experiments were carried out on the high power excimer laser system called "Heaven I", the velocity of iron and aluminium was researched.