Interferometric laser technique for accurate velocity measurement in shock wave physics

Durand, Mathieu; Laharrague, P.; Lalle, P.; Bihan, A. Le; Morvan, J.; Pujols, H.C.

doi:10.1063/1.1135005

Cited by 48 publications

(8 citation statements)

References 3 publications

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“…avec e -1 1 e =1,6 X 10-19 C, mA = 6,63 x 0 367C. 10 10-26 kg, k = 1,3 x 10-23 Jdg-1, 03B1 étant le degré d'ionisation. Limitant l'ionisation à la première, a est la solution de l'équation p/mA a2 + Ka -K = 0, où K est la constante d'équilibre de la réaction A A + + e, définie par avec Q,(T) et Qo(T) les fonctions de partition de l'air et de l'atome neutre, me = 0,9 x 10-30 kg, h = 6,66 x 10-34 J .…”

Section: E Expérienceunclassified

Méthodes expérimentales de détermination du comportement sous choc et en détente du polystyrène et du lithium à l'aide d'un canon à gaz léger

Lezaud¹,

Drean²,

Martineau³

et al. 1985

Rev. Phys. Appl. (Paris)

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2014 A l'aide d'un canon à gaz léger à deux étages, on étudie le comportement sous choc et en détente du lithium et du polystyrène. A cet effet, on utilise les méthodes d'adaptation d'impédance et d'accumulation de choc associées aux diagnostics de chronométrie électronique et d'interférométrie Doppler Laser. Dans le cas du polystyrène, on met en évidence la présence d'un changement de phase au voisinage des 200 kbars. On détermine également l'isentrope de détente du lithium. A cette occasion, la méthode d'adaptation d'impédance appliquée à l'argon comprimé montre la nécessité d'une connaissance approfondie d'une équation d'état prenant en compte les phénomènes d'ionisation. Abstract. 2014 Using two stage light gas gun, we study under shock-loading lithium and polystyrene behaviours. Compression and release isentrope are determined. For this purpose impedance matching and progressive acceleration of free surface technics associated with electronics chronometry and Doppler Laser Interferometry are used. In the case of polystyrene experiments a change in the adiabat is evidenced at about 200 kbars. Lithium isentrope measurements are also obtained. We note that the matching impedance technics applied to the compressed argon gas needs a good knowledge of its equation of state taking into account ionization phenomena.

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Section: E Expérienceunclassified

Méthodes expérimentales de détermination du comportement sous choc et en détente du polystyrène et du lithium à l'aide d'un canon à gaz léger

Lezaud¹,

Drean²,

Martineau³

et al. 1985

Rev. Phys. Appl. (Paris)

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“…[1][2][3][4][5] However, under the aforementioned circumstances these methods have drawbacks. Interferometry is not only relatively expensive, it is also cumbersome and time consuming to set up.…”

Section: Introductionmentioning

confidence: 99%

Fast low-cost fiber-optic displacement sensor

et al. 2005

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We have developed a fiber-optic sensor for measuring dynamic surface displacements caused by shock waves. Light from a LED emitter is sent through a plastic fiber and reflected from the surface back into the fiber. The intensity of the reflected light gives the distance to the surface. Based on simple principles and utilizing inexpensive components, micrometer and microsecond resolution is achieved at lower cost and easier usage than for interferometric methods and with better reliability than an accelerometer. The sensor is comparatively easy to set up. It is battery operated for reduced sensitivity of electromagnetic interference. The design of the fiber probe facilitates access in narrow and hostile environments.

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“…The range of velocities required for this discipline often exceeds 1000 m/s. The standard diagnostics for kilometer-per-second velocities include the VISAR 1, 2, 3 system and the Fabry-Perot-based 4,5 system. Both of these systems use some form of interferometry to convert such high velocities into a more manageable parameter to measure.…”

Section: Introductionmentioning

confidence: 99%

Velocimetry using heterodyne techniques

et al. 2005

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At LLNL, we have been using heterodyne techniques for the past year and a half to measure velocities up to several kilometers-per-second on different types of experiments. We assembled this diagnostic, which we call the Heterodyne Velocimeter (HetV), using commercially available products developed for the communications industry. We use a 1550 nm fiber laser and single mode fibers to deliver light to and from the target. The return Doppler-shifted light is mixed with the original laser light to generate a beat frequency proportional to the velocity. At a velocity of 1000 m/s, the beat signal has a frequency of 1.29 GHz. We record the beat signals directly onto fast digitizers. The maximum velocity is limited by the bandwidth of the electronics and the sampling rate of the digitizers. The record length is limited by the amount of memory contained in the digitizers. This paper describes our approach to measuring velocities with this technique and presents recent data obtained with the HetV.

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Interferometric laser technique for accurate velocity measurement in shock wave physics

Abstract: Articles you may be interested inUltrafast interferometric microscopy for laser-driven shock wave characterization An improved laserschlieren system for the measurement of shockwave velocity Rev. Sci. Instrum. 45, 949 (1974);

Cited by 48 publications

References 3 publications

Méthodes expérimentales de détermination du comportement sous choc et en détente du polystyrène et du lithium à l'aide d'un canon à gaz léger

Méthodes expérimentales de détermination du comportement sous choc et en détente du polystyrène et du lithium à l'aide d'un canon à gaz léger

Fast low-cost fiber-optic displacement sensor

Velocimetry using heterodyne techniques

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