A high-resolution two-dimensional imaging velocimeter

Celliers, P. M.; Erskine, D. J.; Sorce, C. M.; Braun, D. G.; Landen, O. L.; Collins, G. W.
March 2010
Review of Scientific Instruments;Mar2010, Vol. 81 Issue 3, p035101
Academic Journal
Velocity interferometers are typically used to measure velocities of surfaces at a single point or along an imaged line as a function of time. We describe an optical arrangement that enables high-resolution measurements of the two-dimensional velocity field across a shock front or shocked interface. The technique is employed to measure microscopic fluctuations in shock fronts that have passed through materials being considered as ablators for indirect-drive inertial confinement fusion. With picosecond time resolution the instrument captures velocity modes with wavelengths as short as 2.5 μm at a resolution of ∼10 m/s rms on velocity fields averaging many km/s over an 800 μm field of view.


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