RECOVERING A SHORT TIMESCALE SIGNAL FROM A PAIR OF LONG-DELAY VISARS

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We introduce the benefits of analyzing VISAR data in the Fourier domain, particularly for recovering the short time scale signal component. In particular, by combining data from two VISARS having different long delays, we effectively reproduce the short time resolution ability of a short delay while retaining the superior sensitivity to absolute velocity of a long delay. Two different delays are generally desired, not only to untangle integer fringe skips, but to circumvent the fact that a single VISAR cannot record signal components of frequencies periodic with its reciprocal delay. Combining two different delays solves this. We treat the VISARs ... continued below

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6 p. (0.3 MB)

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Erskine, D J February 20, 2011.

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We introduce the benefits of analyzing VISAR data in the Fourier domain, particularly for recovering the short time scale signal component. In particular, by combining data from two VISARS having different long delays, we effectively reproduce the short time resolution ability of a short delay while retaining the superior sensitivity to absolute velocity of a long delay. Two different delays are generally desired, not only to untangle integer fringe skips, but to circumvent the fact that a single VISAR cannot record signal components of frequencies periodic with its reciprocal delay. Combining two different delays solves this. We treat the VISARs as linear filters and process and combine the signals in the Fourier domain with a direct equation, without any iteration of time-retarded equations. The technique is demonstrated with a numerical simulation.

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6 p. (0.3 MB)

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PDF-file: 6 pages; size: 0.3 Mbytes

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  • Presented at: APS Shock Cmprssn. Cndsnd. Matter, Chicago, IL, United States, Jun 26 - Jul 01, 2011

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  • Report No.: LLNL-PROC-486471
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1022909
  • Archival Resource Key: ark:/67531/metadc831833

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  • February 20, 2011

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  • May 19, 2016, 3:16 p.m.

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  • April 13, 2017, 6:23 p.m.

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Erskine, D J. RECOVERING A SHORT TIMESCALE SIGNAL FROM A PAIR OF LONG-DELAY VISARS, article, February 20, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc831833/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.