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Patents

Optically Initiated Silicon Carbide High Voltage Switch
George J. Caporaso, Stephen E. Sampayan, James S. Sullivan,
David M. Sanders
U.S. Patent 7,893,541 B2
February 22, 2011
An improved photoconductive switch has a substrate made of silicon carbide or another wide-bandgap material, such as gallium arsenide, and field-grading liners. The liners are composed preferably of silicon nitride formed on the substrate adjacent to the electrode or substrate perimeters for grading the electric fields.

Gain Media Edge Treatment to Suppress Amplified Spontaneous Emission in a High Power Laser
Lloyd A. Hackel, Thomas F. Soules, Scott N. Fochs, Mark D. Rotter, Stephan A. Letts
U.S. Patent 7,894,496 B2
February 22, 2011
In this method for suppressing amplified spontaneous emission or parasitic oscillation modes in a laser, one or more peripheral edges of a solid-state crystal or ceramic laser gain media are roughened and then bonded to an electromagnetic absorbing material adjacent to the entire outer surface of the roughened laser gain media. The apparatus can thus effectively suppress amplified spontaneous emission, parasitic oscillation modes, and residual pump energy.

Lateral Flow Strip Assay
Robin R. Miles, William J. Benett, Matthew A. Coleman,
Francesca S. Pearson, Shanavaz L. Nasarabadi
U.S. Patent 7,901,623 B2
March 8, 2011
This apparatus has a lateral flow strip with a receiving portion, a sample collection unit, and a reagent reservoir. Saliva or buccal cells from an individual are placed in the sample collection unit, which is then immersed in the reagent reservoir. When the tip of the lateral flow strip is immersed in the reservoir, the reagent–sample mixture wicks up into the strip to perform the assay.

Slit Disk for Modified Faraday Cup Diagnostic for Determining Power Density of Electron and Ion Beams
Alan T. Teruya, John W. Elmer, Todd A. Palmer
U.S. Patent 7,902,503 B2
March 8, 2011
A diagnostic system for characterizing an electron or ion beam includes an electrical conducting disk made of refractory material and a Faraday cup positioned to receive the beam. The disk has at least one slit between its circumference and center. One portion of the disk is in radial alignment with the center, and another portion deviates from this alignment. When an electron or ion beam is directed onto the disk, it is translated so that it enters the slit where it can be diagnostically characterized.

Portable Convertible Blast Effects Shield
John W. Pastrnak, Rocky Hollaway, Carl D. Henning, Steve Deteresa, Walter Grundler, Lisle B. Hagler, Edwin Kokko, Vernon A. Switzer
U.S. Patent 7,905,168 B2
March 15, 2011
A rapidly deployable, portable, convertible blast effects and ballistics shield includes a set of two or more tapered telescoping rings connected to each other so that the shield can be collapsed for storage and transport or extended to form an expanded inner volume. One upright configuration provides blast effects shielding, for example, against blast pressures, shrapnel, or fireballs. A second configuration shields against ballistics such as incoming weapons fire or shrapnel. The telescoping rings are made of a high-strength material such as a composite fiber and matrix material that can substantially inhibit blast effects and prevent projectiles from passing through the shield. When telescopically extended, the rings are secured to each other by the friction fit of adjacent pairs in the set.

Optical Fiber Having Wave-Guiding Rings
Michael J. Messerly, Jay W. Dawson, Raymond J. Beach,
Christopher P. J. Barty
U.S. Patent 7,907,810 B2
March 15, 2011
In this waveguide, a cladding region with a substantially uniform refractive index surrounds a waveguiding region that has an average index close to the index of the cladding. The waveguiding region also contains a thin ring or series of rings whose index or indices differ significantly from the index of the cladding, thus enabling the structure to guide light.

False Alarm Recognition in Hyperspectral Gas Plume Identification
James L. Conger, Janice K. Lawson, William D. Aimonetti
U.S. Patent 7,916,947 B2
March 29, 2011
In this method for analyzing hyperspectral data, a hyperspectral imager collects a first set of data from a scene during a no-gas period and analyzes the data using one or more gas-plume detection logics. The gas-plume detection logic is executed using a low detection threshold so that each occurrence of an observed hyperspectral signature is recorded. The method generates a histogram for all occurrences of observed signatures and uses it to determine a probability of false alarm for these occurrences. At some other time, the method collects a second set of hyperspectral data. This second data set is then analyzed using one or more of the gas-plume detection logics, which generates a probability of false alarm and determines if any gas is present.


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