Compact system for high-speed velocimetry using heterodyne techniques

DOI PDF 2 Citations
  • O. T. Strand
    Lawrence Livermore National Laboratory , Livermore, California 94550
  • D. R. Goosman
    Lawrence Livermore National Laboratory , Livermore, California 94550
  • C. Martinez
    Lawrence Livermore National Laboratory , Livermore, California 94550
  • T. L. Whitworth
    Lawrence Livermore National Laboratory , Livermore, California 94550
  • W. W. Kuhlow
    Bechtel Nevada , 2621 Losee Road, North Las Vegas, Nevada 89030

Bibliographic Information

Published
2006-08-01
DOI
  • 10.1063/1.2336749
Publisher
AIP Publishing

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<jats:p>We have built a high-speed velocimeter that has proven to be compact, simple to operate, and fairly inexpensive. This diagnostic is assembled using off-the-shelf components developed for the telecommunications industry. The main components are fiber lasers, high-bandwidth high-sample-rate digitizers, and fiber optic circulators. The laser is a 2W cw fiber laser operating at 1550nm. The digitizers have 8GHz bandwidth and can digitize four channels simultaneously at 20GS∕s. The maximum velocity of this system is ∼5000m∕s and is limited by the bandwidth of the electrical components. For most applications, the recorded beat frequency is analyzed using Fourier transform methods, which determine the time response of the final velocity time history. Using the Fourier transform method of analysis allows multiple velocities to be observed simultaneously. We have obtained high-quality data on many experiments such as explosively driven surfaces and gas gun assemblies.</jats:p>

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