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Title: Fabry-Perot / PDV Comparison


No abstract prepared.

; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
TRN: US200822%%455
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Presented at: 51st Annual Fuze Conference, Nashville, TN, United States, May 22 - May 24, 2007
Country of Publication:
United States

Citation Formats

Hodgin, R, May, C, Hanks, R, Hansen, D, Whitworth, T, and Strand, T. Fabry-Perot / PDV Comparison. United States: N. p., 2007. Web.
Hodgin, R, May, C, Hanks, R, Hansen, D, Whitworth, T, & Strand, T. Fabry-Perot / PDV Comparison. United States.
Hodgin, R, May, C, Hanks, R, Hansen, D, Whitworth, T, and Strand, T. Wed . "Fabry-Perot / PDV Comparison". United States. doi:.
title = {Fabry-Perot / PDV Comparison},
author = {Hodgin, R and May, C and Hanks, R and Hansen, D and Whitworth, T and Strand, T},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 02 00:00:00 EDT 2007},
month = {Wed May 02 00:00:00 EDT 2007}

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  • Two types of superconducting electromagnetic actuators--linear and angular--for precise control of Fabry-Perot spectrometer etalons at liquid helium temperature were manufactured and tested successfully. The linear displacement unit (45 Newtons/Amp) has maximum travel of + or - 44 um with offaxis deviation of less than 1.5 arcseconds for 15 um path. The angular unit has maximum tilt of + or - 8 arcminutes and can maintain parallelism of two etalons to better than 0.3 arcsecond of angle by compensating the differential contraction upon cooling and off-axis deviation of the linear displacement unit. These actuators are proving especially useful in low temperaturemore » infrared instrumentation where other choices, such as piezoelectric crystals, fail and where essentially zero power dissipation permits low infrared backgrounds to be maintained along with long cryogenic lifetimes.« less
  • The Fabry Perot has become an important and valuable tool by which explosive performance information can be obtained relatively easily and inexpensively. Principle uses of the Fabry Perot have been free surface, and particle velocity measurements in one dimensional studies of explosive performance. In the cylinder test, it has been very useful to resolve early wall motions. We have refined methods of characterizing new explosives i.e. equation of state, C-J pressure, via the cylinder shot, flat plate, and particle velocity techniques. All of these use Fabry Perot as one of the principle diagnostics. Each of these experimental techniques are discussedmore » briefly and some of the results obtained. Modeling developed to fit Fabry-Perot results are described along with future testing.« less
  • The Fabry-Perot (F-P) velocimeter is our main diagnostic tool for hypervelocity impact experiments with the electric gun. Because of its immunity to electromagnetic interference, F-P velocimetry is well suited to studying the performance of flyers, providing data on velocity calibration, acceleration characteristics, and material erosion as well as spallation of various materials under high-velocity impact, measurement of impact pressure pulses, and Hugoniot measurements of composite materials. We present results and data from selected experiments and compare them with code predictions. 9 refs., 10 figs.
  • The Fabry--Perot (F--P) velocimeter is a useful instrument for measuring the velocity of objects at speeds ranging from fractions of a kilometer per second to a few tens of kilometers per second and up. Because of its immunity to electromagnetic interference and its velocity resolution, it has become the prime diagnostic tool in our electric-gun facility. Examples of its application to high-speed experiments include the following areas: Electric-gun flyer studies; Spallation of materials under high-speed impact; Momentum-transfer studies; Pressure pulse created by high-velocity impact; Detonation-wave studies in high-explosive experiments. The F--P velocimeter at Lawrence Livermore National Laboratory (LLNL) includes amore » long-pulse laser amplifier, two-channel recording capability, air or fiber-optic transport of laser light, light enhancement through the F--P proper, and an electronic streaking camera with microchannel-plate intensifier. Data reduction includes a digitizing system that employs a video camera and a personal computer for manipulating fringe curves and calculating velocities. Software corrects distortions from the streak camera used to generate the record. Our system yields a velocity measurement with an accuracy of 1 to 2%. 11 refs., 7 figs.« less