Embedded Fiber Optic Probes to Measure Detonation Velocities Using the Photonic Doppler Velocimeter

Conference · Tue Mar 02 04:00:00 EST 2010

OSTI ID:978410

Hare, D E; Holtkamp, D B; Strand, O T

Detonation velocities for high explosives can be in the 7 to 8 km/s range. Previous work has shown that these velocities may be measured by inserting an optical fiber probe into the explosive assembly and recording the velocity time history using a Fabry-Perot velocimeter. The measured velocity using this method, however, is the actual velocity multiplied times the refractive index of the fiber core, which is on the order of 1.5. This means that the velocimeter diagnostic must be capable of measuring velocities as high as 12 km/s. Until recently, a velocity of 12 km/s was beyond the maximum velocity limit of a homodyne-based velocimeter. The limiting component in a homodyne system is usually the digitizer. Recently, however, digitizers have come on the market with 20 GHz bandwidth and 50 GS/s sample rate. Such a digitizer coupled with high bandwidth detectors now have the total bandwidth required to make velocity measurements in the 12 km/s range. This paper describes measurements made of detonation velocities using a high bandwidth homodyne system.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 978410
• Report Number(s): LLNL-PROC-425117
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
42 ENGINEERING
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMICAL EXPLOSIVES
DIGITIZERS
EXPLOSIONS
EXPLOSIVES
FIBER OPTICS
FIBERS
MARKET
OPTICAL FIBERS
PROBES
REFRACTIVE INDEX
VELOCIMETERS
VELOCITY