Compact system for high-speed velocimetry using heterodyne techniques

Strand, Oliver T.; Goosman, D.R.; Martinez, Carolyn; Whitworth, Tony L.; Kuhlow, William

doi:10.1063/1.2336749

Cited by 781 publications

(257 citation statements)

References 4 publications

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“…An obvious result of this calculation is that the signal fringes get closer together as ramp velocity increases, i.e. the beat frequency is proportional to velocity (as expected [2]). Closer inspection reveals that the signal baseline vertically "hops" away from the zero at the onset of motion.…”

Section: Examplesmentioning

confidence: 90%

“…orders@ntis.fedworld.gov Online ordering: http://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online This report describes the fringen program, which performs forward VISAR (Velocity Interferometer System for Any Reflector [1]) and PDV (Photonic Doppler Velocimetry, also known as heterodyne velocimetry [2]) analysis. Nearly all effects that might occur in VISAR/PDV measurement of a single velocity can be modeled by fringen.…”

Section: Telephonementioning

confidence: 99%

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Velocimetry signal synthesis with fringen.

Dolan¹

2011

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An important part of velocimetry analysis the recovery of a known velocity history from simulated data signals. The fringen program synthesizes VISAR and PDV signals, given a specified velocity history, using exact formulations for the optical signal. Time-dependent light conditions, non-ideal measurement conditions, and various diagnostic limitations (noise, etc.) may be incorporated into the simulated signals. 3 AcknowledgementsThe fringen program evolved from a set of MATLAB utilities for other programs, such as PointVISAR. Testing these programs required velocimetry signals that correspond with a known velocity history. It became tedious to manually create these synthetic signals, so I began to formalize these code fragments into a common function. This process accelerated during the development of THRIVE (SAND2008-3871), where a set of formal benchmark problems were required.The operation and features of fringen was motivated by conversions with

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Section: Examplesmentioning

confidence: 90%

Section: Telephonementioning

confidence: 99%

Velocimetry signal synthesis with fringen.

Dolan¹

2011

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“…27 In the present research, the shock pressure induced by glass-confined LSP is measured with a newly developed photonic Doppler velocimetry (PDV). [27][28][29] Compared with water-confined LSP, glass-confinement generates much higher pressure which can be easily reproduced. Since its invention, the use of PDV has been rapidly spreading as a powerful diagnostic method for tracking velocity on the short time scales in shock-wave experiments 29 and other related areas.…”

Section: Introductionmentioning

confidence: 99%

Shock pressure induced by glass-confined laser shock peening: Experiments, modeling and simulation

Zhang

Song

et al. 2011

Journal of Applied Physics

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Infrared thermometry and interferential microscopy for analysis of crater formation at the surface of fused silica under CO2 laser irradiation J. Appl. Phys. 111, 063106 (2012) The interaction of 193-nm excimer laser irradiation with single-crystal zinc oxide: Positive ion emission J. Appl. Phys. 111, 063101 (2012) Laser produced streams of Ge ions accelerated and optimized in the electric fields for implantation into SiO2 substrates Rev. Sci. Instrum. 83, 02B305 (2012) Formation of metallic colloids in CaF2 by intense ultraviolet light Appl. Phys. Lett. 99, 261909 (2011) Study on characteristic parameters influencing laser-induced damage threshold of KH2PO4 crystal surface machined by single point diamond turning J. Appl. Phys. 110, 113103 (2011) Additional information on J. Appl. Phys. The shock pressure generated by the glass confined regime in laser shock peening and its attenuation in the target material are investigated. First, the particle velocity of the target back free surface induced by laser generated shock pressure of this regime is measured using a photonic Doppler velocimetry system. The temporal profile of the particle velocity at the back free surface, where the elastic precursor is captured, manifests a powerful diagnostic capability of this newly developed photonic Doppler velocimetry system for tracking the velocity on short time scales in shock-wave experiments. Second, a coupling pressure analytical model, in which the material constitutive models of confined layers and target material are considered, is proposed to predict the plasma pressure profile at the surface of target. Furthermore, using the predicted shock pressure profile as the input condition, the dynamic response of the target under the shock pressure is simulated by LS-DYNA. The simulated back free surface velocity profile agrees well with that measured by the photonic Doppler velocimetry system. Finally, the attenuation behavior of stress waves and particle velocities in the depth of the target is analyzed, and it indicates an exponential decay. The corresponding empirical formulas for the attenuation behavior are given based on the numerical results.

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“…Photon Doppler Velocimetry (PDV) was used to obtain velocimetry information over a spot size of approximately 0.5 mm. This technique is described elsewhere [16]. Experimental parameters are listed in Table I.…”

Section: Plate Impact Experimentsmentioning

confidence: 99%

Shock induced multi-mode damage in depleted Uranium

Koller

Cerreta

Gray

2009

DYMAT 2009 - 9th International Conferences on the Mechanical and Physical Behaviour of Materials Under Dynamic Loading

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Recent dynamic damage studies on depleted uranium samples have revealed mixed mode fai,lure mechanisms leading to incipient cracking as well as ductile failure processes. Results show that delamination of inclusions upon compression may provide nucleation sites for damage initiation in the fonn of crack tip production. However, under tension the material propagates cracks in a mixed shear localization and mode-I ductile tearing and cracking. Cracks tips appear to link up through regions of severe, shear dominated plastic flow. Shock recovery experiments were conducted on a 50 mm single stage light gas gun. Serial metallographic sectioning was conducted on the recovered samples to characterize the bulk response of the sample. Experiments show delaminated inclusions due to uniaxial compression without damage propagation. Further results show the propagation of the damage through tensile loading to the incipient state, illustrating ductile processes coupled with mixed mode-l tensile ductile tearing, shear localization, and mode-I cracking in depleted uranium.

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Compact system for high-speed velocimetry using heterodyne techniques

Cited by 781 publications

References 4 publications

Velocimetry signal synthesis with fringen.

Velocimetry signal synthesis with fringen.

Shock pressure induced by glass-confined laser shock peening: Experiments, modeling and simulation

Shock induced multi-mode damage in depleted Uranium

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