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Title: Velocimetry Using Heterodyne Techniques

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.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15014556
Report Number(s):
UCRL-CONF-206034
Journal ID: ISSN 0277-786X; TRN: US200802%%1300
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 5580; Conference: Presented at: Velocimetry Using Heterodyne Techniques, Alexandria, VA, United States, Sep 20 - Sep 23, 2004
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; COMMUNICATIONS; DIGITIZERS; FIBERS; LASERS; LAWRENCE LIVERMORE NATIONAL LABORATORY; SAMPLING; VELOCIMETERS; VELOCITY

Citation Formats

Strand, O T, Berzins, L V, Goosman, D R, Kuhlow, W W, Sargis, P D, and Whitworth, T L. Velocimetry Using Heterodyne Techniques. United States: N. p., 2004. Web. doi:10.1117/12.567579.
Strand, O T, Berzins, L V, Goosman, D R, Kuhlow, W W, Sargis, P D, & Whitworth, T L. Velocimetry Using Heterodyne Techniques. United States. doi:10.1117/12.567579.
Strand, O T, Berzins, L V, Goosman, D R, Kuhlow, W W, Sargis, P D, and Whitworth, T L. Tue . "Velocimetry Using Heterodyne Techniques". United States. doi:10.1117/12.567579. https://www.osti.gov/servlets/purl/15014556.
@article{osti_15014556,
title = {Velocimetry Using Heterodyne Techniques},
author = {Strand, O T and Berzins, L V and Goosman, D R and Kuhlow, W W and Sargis, P D and Whitworth, T L},
abstractNote = {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.},
doi = {10.1117/12.567579},
journal = {},
issn = {0277-786X},
number = ,
volume = 5580,
place = {United States},
year = {2004},
month = {8}
}

Conference:
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