Journal ArticleDOI
Interferometric laser technique for accurate velocity measurement in shock wave physics
TLDR
In this paper, an interferometric system for continuously measuring specimen velocity is described, where the Doppler shift of a laser beam reflected from the free surface is transformed into a variation of the diameter of Fabry-Perot interference rings, and the evolution of diameter versus time is continuously recorded by a streak camera.Abstract:
An interferometric system for continuously measuring specimen velocity is described. The Doppler shift of a laser beam reflected from the specimen’s free surface is transformed into a variation of the diameter of Fabry–Perot interference rings, and the evolution of the diameter versus time is continuously recorded by a streak camera. Two examples of the use of this system for study of shock waves are given to show the accuracy of this device.read more
Citations
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Journal ArticleDOI
Probing the underlying physics of ejecta production from shocked Sn samples
Michael B. Zellner,W. Vogan McNeil,James E. Hammerberg,Robert Hixson,A. W. Obst,R. T. Olson,J. R. Payton,Paulo Rigg,Nathan Routley,Gerald Stevens,William Turley,L. R. Veeser,William T. Buttler +12 more
TL;DR: In this paper, the authors investigated the underlying physics of ejecta production for high explosive (HE) shocked Sn surfaces prepared with finishes typical to those roughened by tool marks left from machining processes.
Journal ArticleDOI
Velocimetry of fast surfaces using Fabry–Perot interferometry
Charles F. McMillan,D. R. Goosman,N. L. Parker,Lloyd L. Steinmetz,H. H. Chau,T. Huen,R. K. Whipkey,S. J. Perry +7 more
TL;DR: In this paper, the use of the Fabry-Perot laser interferometer in the fringe mode to measure velocities of fast-moving reflecting surfaces is described, and an experimental test of whether surface normal direction affects Doppler shift is performed.
Proceedings ArticleDOI
Velocimetry using heterodyne techniques
Oliver T. Strand,L.V. Berzins,David R. Goosman,William W. Kuhlow,Paul D. Sargis,Tony L. Whitworth +5 more
TL;DR: The Heterodyne Velocimeter (HetV) as mentioned in this paper uses a 1550 nm fiber laser and single mode fibers to deliver light to and from the target, and the return Doppler-shifted light is mixed with the original laser light to generate a beat frequency proportional to the velocity.
Journal ArticleDOI
Lagrangian analysis. Modern tool of the dynamics of solids
TL;DR: In this article, the authors introduce the mathematical tools used to analyze plane and spherical one-dimensional motions, and discuss the different kinds of sources of errors that may be encountered when using Lagrangian analysis.
Journal ArticleDOI
Surface preparation methods to enhance dynamic surface property measurements of shocked metal surfaces
Michael B. Zellner,W. Vogan McNeil,George T. Gray,D. C. Huerta,Nicholas S. P. King,G. E. Neal,S. J. Valentine,J. R. Payton,Jim Rubin,Gerald Stevens,William Turley,William T. Buttler +11 more
TL;DR: In this paper, surface-preparation methods to enhance dynamic surface-property measurements of shocked metal surfaces were investigated, and the amount of material ejected from the free surface upon shock release to vacuum (ejecta) was monitored for shocked Al-1100 and Sn targets.
References
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Journal ArticleDOI
Shock wave study of the α ⇄ ε phase transition in iron
L. M. Barker,R. E. Hollenbach +1 more
TL;DR: In this article, the free surface velocities of Armco iron specimens and impactors were obtained with the VISAR laser interferometer instrumentation system, which provided new information concerning the rate effects associated with the α → e polymorphic phase transition at 13 GPa, material strength and release wave speeds at 10 and 40 GPa.
Journal ArticleDOI
Interferometer Technique for Measuring the Dynamic Mechanical Properties of Materials
L. M. Barker,R. E. Hollenbach +1 more
TL;DR: In this paper, a new technique is described for measuring the position history of the free surface of an impacted specimen, and measurements can be made to 0.025 μ accuracy at free surface velocities up to 1 mm/μsec.
Journal ArticleDOI
Free Surface Velocity Measurement of an Impacted Projectile by Optical Doppler Shift
P. M. Johnson,T. J. Burgess +1 more
TL;DR: An optical technique for measuring the velocity of an accelerating, specularly reflecting surface from a position on the axis of motion has been successfully applied to a free surface velocity measurement of an impacted projectile in a pneumatic accelerator.
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Laser interferometer for measuring high velocities of any reflecting surface
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