Application of Fabry--Perot velocimeter to high-speed experiments

Conference · Mon Aug 01 00:00:00 EDT 1988

OSTI ID:6775240

Chau, H H; McMillan, C F; Osher, J E

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 a 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.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6775240
• Report Number(s): UCRL-98483; CONF-8808103-3; ON: DE88016269
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450100 -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
47 OTHER INSTRUMENTATION
CAMERAS
DATA
DIAGRAMS
ELECTRON GUNS
EXPLOSIONS
FABRY-PEROT INTERFEROMETER
FIBERS
FLOWSHEETS
IMPACT SHOCK
IMPACT TESTS
INFORMATION
INTERFEROMETERS
MATERIALS TESTING
MEASURING INSTRUMENTS
MECHANICAL TESTS
MOMENTUM TRANSFER
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUMERICAL DATA
OPTICAL FIBERS
RADIATION DETECTORS
SPALLATION
SPALLATION FRAGMENTS
STREAK CAMERAS
TESTING
VELOCIMETERS