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Proceedings Paper

Velocimetry using heterodyne techniques
Author(s): Oliver Ted Strand; Leon Val Berzins; David R. Goosman; William W. Kuhlow; Paul D. Sargis; Tony L. Whitworth
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Paper Abstract

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.

Paper Details

Date Published: 17 March 2005
PDF: 7 pages
Proc. SPIE 5580, 26th International Congress on High-Speed Photography and Photonics, (17 March 2005); doi: 10.1117/12.567579
Show Author Affiliations
Oliver Ted Strand, Lawrence Livermore National Lab. (United States)
Leon Val Berzins, Lawrence Livermore National Lab. (United States)
David R. Goosman, Lawrence Livermore National Lab. (United States)
William W. Kuhlow, Bechtel Nevada (United States)
Paul D. Sargis, Lawrence Livermore National Lab. (United States)
Tony L. Whitworth, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 5580:
26th International Congress on High-Speed Photography and Photonics
Dennis L. Paisley; Stuart Kleinfelder; Donald R. Snyder; Brian J. Thompson, Editor(s)

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