Design, Construction, Alignment, and Calibration of a Compact Velocimetry Experiment
A velocimetry experiment has been designed to measure shock properties for small cylindrical metal targets (8-mm-diameter by 2-mm thick). A target is accelerated by high explosives, caught, and retrieved for later inspection. The target is expected to move at a velocity of 0.1 to 3 km/sec. The complete experiment canister is approximately 105 mm in diameter and 380 mm long. Optical velocimetry diagnostics include the Velocity Interferometer System for Any Reflector (VISAR) and Photon Doppler Velocimetry (PDV). The packaging of the velocity diagnostics is not allowed to interfere with the catchment or an X-ray imaging diagnostic. A single optical relay, using commercial lenses, collects Doppler-shifted light for both VISAR and PDV. The use of fiber optics allows measurement of point velocities on the target surface during accelerations occurring over 15 mm of travel. The VISAR operates at 532 nm and has separate illumination fibers requiring alignment. The PDV diagnostic operates at 1550 nm, but is aligned and focused at 670 nm. The VISAR and PDV diagnostics are complementary measurements and they image spots in close proximity on the target surface. Because the optical relay uses commercial glass, the axial positions of the optical fibers for PDV and VISAR are offset to compensate for chromatic aberrations. The optomechanical design requires careful attention to fiber management, mechanical assembly and disassembly, positioning of the foam catchment, and X-ray diagnostic field-of-view. Calibration and alignment data are archived at each stage of the assembly sequence.
- Research Organization:
- National Security Technologies, LLC (NSTec), Mercury, NV (United States)
- Sponsoring Organization:
- USDOE - National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- DE-AC52-06NA25946
- OSTI ID:
- 926623
- Report Number(s):
- DOE/NV/25946-250; TRN: US0804186
- Journal Information:
- Proceedings of SPIE, Vol. 6676; Conference: 2007 SPIE Optics and Photonics Conference; San Diego, CA; August 26-30, 2007; ISSN 0277-786X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALIGNMENT
CALIBRATION
CHEMICAL EXPLOSIVES
CHROMATIC ABERRATIONS
CONSTRUCTION
CONTAINERS
DESIGN
FIBER OPTICS
FIBERS
ILLUMINANCE
INTERFEROMETERS
LENSES
OPTICAL FIBERS
OPTICS
PACKAGING
PHOTONS
POSITIONING
TARGETS
VELOCITY
velocimetry
VISAR
PDV
calibration
alignment
photon budget
fiber optics