| Autor: |
Andriyash, A. V., Kondratev, A. N., Kuratov, S. E., Rogozkin, D. B., Astashkin, M. V., Baranov, V. K., Golubinskii, A. G., Irinichev, D. A., Khatunkin, V. Yu., Mazanov, V. A., Stepushkin, S. N. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 2018, Vol. 123 Issue 24, pN.PAG-N.PAG, 11p, 1 Diagram, 1 Chart, 10 Graphs |
| Abstrakt: |
We consider the problem of recovering the physical parameters of ejecta from data of photon Doppler velocimetry (PDV). The results of PDV measurements of ejecta production from shock-loaded Pb samples are presented. Shockwaves in the samples were generated by an accelerated flyer-plate. Depending on the sample thickness, the shock-breakout pressure varied from 27.5 to 43 GPa. The ejecta transport occurred in the air. The spectral profile J ( ω ) of heterodyne beats underlies our analysis of the experiments. The noise-free component of | J ( ω ) | 2 is shown to obey the transport equation which accounts for multiple scattering and absorption of the probing beam in the cloud of moving particles. This provides a means for theoretical modeling of PDV data. Varying the values of the free-surface velocity and the parameters of the velocity distribution of ejecta, we fit the calculated spectrum to the PDV-measured one. We apply this method to time-resolved PDV spectra and, based on the ejecta optical model, recover the values of the free-surface velocity, the areal density, and the density-velocity distribution of ejecta. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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