Accuracy limits and window corrections for photon Doppler velocimetry

Abstract

Symmetric, plate-impact experiments were performed to validate photon Doppler velocimetry (PDV) with established shock wave diagnostics. Impact velocity measurements using shorting pins demonstrated that the velocity accuracy of PDV can be 0.1% or better. Shock velocities and refractive indices were also measured with PDV (at 1550 nm) and velocity interferometer system for any reflector (VISAR) (at 532 nm) to obtain window corrections for single crystal LiF (100), c-cut sapphire, and z-cut quartz. Time-dependent, free-surface velocity histories for shocked LiF(100) provide a direct comparison between PDV and VISAR diagnostics and illustrate the benefits and shortcomings of the new diagnostic. Further implications of these results are presented.

Experimental observations of detonation in ammonium-nitrate-fuel-oil (ANFO) surrounded by a high-sound-speed, shockless, aluminum confiner

“…Photonic-Doppler Velocimetry (PDV), a light-based interferometry technique [8], was used to obtain the tube wall velocity during test 12-914. Four focused probes (PDV1-PDV4) were mounted along the sidewall of the tube and four collimated probes (PDV5-PDV8) were stationed in a radial line along the end window (Fig.…”

Velocity spectra from explosively driven powders and balls

“…We perform many experiments in which we drive metal with high explosives and attempt to observe the surface motion with Photon Doppler Velocimetry (PDV) [1,2]. Often we find that the motion begins with a single velocity but that after some time, the single velocity disappears and a broad distribution of velocities takes its place.…”

SIRHEN : a data reduction program for photonic Doppler velocimetry measurements.

“…PDV data may be analyzed in terms of either a displacement or a velocity framework [4]. The displacement mode analysis is more fundamental and provides a helpful starting point for the discussion.…”