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Guided Acoustic Wave Inspection System
Diane J. Chinn
U.S. Patent 6,799,466 B2
October 5, 2004
A system for inspecting a conduit for undesirable characteristics has a transducer system that induces guided acoustic waves onto said conduit. The conduit has at least two sides, and the transducer system uses flexural modes of propagation to provide inspection using access from only the one side of the conduit. Cracking is detected with pulse-echo testing using one transducer to both send and receive the guided acoustic waves. Thinning is detected in through-transmission testing where one transducer sends and another transducer receives the guided acoustic waves.

High Power Density Solid Oxide Fuel Cells
Ai Quoc Pham, Robert S. Glass
U.S. Patent 6,803,141 B2
October 12, 2004
A method for producing ultrahigh-power-density solid oxide fuel cells (SOFCs) involves the formation of a multilayer structure. A buffer layer of doped ceria is deposited between a zirconia electrolyte and a cobalt iron–based electrode using a colloidal spray deposition (CSD) technique. For example, a cobalt iron–based cathode may be deposited on a zirconia electrolyte via a buffer layer of doped ceria deposited by the CSD technique. These SOFCs have a power density of 1,400 megawatts per square centimeter (MW/cm2) at 600°C and 900 MW/cm2 at 700°C, which constitutes a power density two to three times greater than that produced by conventional SOFCs.

Wollaston Prism Phase-Stepping Point Diffraction Interferometer and Method
Michael C. Rushford
U.S. Patent 6,804,009 B2
October 12, 2004
This Wollaston prism phase-stepping point diffraction interferometer can be used as a test optic. The Wollaston prism shears light into reference and signal beams and provides phase stepping at increased accuracy by translating the Wollaston prism in a lateral direction with respect to the optical path. The reference beam produced by the Wollaston prism is directed through the pinhole of a diaphragm to produce a perfect spherical reference wave. The reference wave is then recombined with the signal beam to produce an interference fringe pattern of greater accuracy.

Optical Chirped Beam Amplification and Propagation
Christopher P. J. Barty
U.S. Patent 6,804,045 B2
October 12, 2004
This short-pulse laser system uses dispersive optics in a chirped-beam amplification architecture to produce high peak power pulses and high peak intensities. It also eliminates the potential for intensity-dependent damage to downstream optical components after amplification.


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Lawrence Livermore National Laboratory
Operated by the University of California for the U.S. Department of Energy

UCRL-52000-04-12 | December 7, 2004