Northrop Grumman Systems Corporation

Donald DiMarzio

John Douglas Weir

Ronald Gary Pirich

Steven Chu

Dennis John Leyble

John Frederick Klein

Nils J Fonneland

Andre E Berghmans

Theodore W Hilgeman

Mary Colby

Stephane Larouche

Vesna Radisic

Robert Silberstein

Thomas J Hunt

Roy A Charletta

Michael Melnyk

Alice DiBiasio

Douglas R Frei

A non-reciprocal band pass filter including a transmission line having a plurality of repeating finite size unit cells, where each unit cell has a predetermined length and includes an inductor and a varactor. The filter also includes a signal source providing a transmission signal that propagates on the transmission line, and a modulation source providing a modulation signal that modulates the varactor. A ratio between the predetermined length of the unit cells and a frequency of the modulation signal is selected to provide propagation modes that allow the transmission signal to propagate along the transmission line in one direction in a controlled pass band, but prevent the transmission signal from propagating along the transmission line in the opposite direction in the controlled pass band.

Non-reciprocal band pass filter

An apparatus includes a lighter than air platform, a reversible propulsive/wind turbine, a deployable anchor to constrain movement of the lighter than air platform with respect to an anchor point allowing wind to drive the turbine, and a generator/motor coupled to the turbine to produce electrical power when movement of the lighter than air platform is constrained. A method performed by the apparatus is also provided.

Wind power generation system for lighter than air (LTA) platforms

UV resistant inorganic coatings which exhibit photochemical activity that destroys toxic biological and chemical agents are disclosed. The inorganic coatings include semiconductor metal oxide nanoparticles that are photo-chemically active dispersed in an inorganic binder. In one embodiment, anatase titanium dioxide nanoparticles are dispersed in a silicon dioxide or silicate binder. Applications may include spacecraft, aircraft, ships, military vehicles, high value equipment and buildings such as subway stations, hospitals, railroad stations and stadiums.

Self-decontaminating inorganic coatings containing semiconductor metal oxide nanoparticles

An improved system for visual inspection of substrates coated with paints and polymers is disclosed. Painted substrates can be inspected for environmental and physical damage such as corrosion and cracks without removing the paint. The present invention provides the ability to maximize paint thickness penetration. This is accomplished with a spectral bandpass filter that rejects reflected light from the coating opaque bands, while allowing light in the paint window to pass to an IR detector such as an IR camera focal plane. The narrow bandpass range enhances the ability for IR imaging to see through thicker paint layers and improves the contrast over standard commercial IR mid-wave cameras. The bandpass may be adjusted to coincide with the full spectral window of the paint, consistent with the ability of the imaging focal plane to detect light in the spectral region.

Spectral filter system for infrared imaging of substrates through coatings

A system is disclosed which utilizes the substantially steady-state temperature of a coated object, in conjunction with an optical detection system, to selectively view defects and features of the object below the coating without the necessity of transient heating or IR illumination and reflectance imaging. The optical detector, such as an IR camera, may be tailored for the wavelengths at which the coating material is substantially transparent, thereby maximizing the viewing clarity of the defects and features under the coating, and distinguishing them from any spurious features on the top surface of the coating. The present system enables the inspection of small or large areas in real time, without requiring complex image acquisition, storage and image processing equipment and software.

System for detecting structural defects and features utilizing blackbody self-illumination

A microbicidal filter system having superior drop pressure and low complexity is provided, as well as a method for producing the same. The system comprises a plurality of glass beads having pores formed therebetween for the flow of air therethrough. The sintered glass beads are coated in a transition metal oxide and water. An ultraviolet light source is used to cause a photocatalytic reaction between the transition metal oxide and water. Free hydroxyl radicals with microbicidal properties are produced. Urethane foam may be inserted between the glass beads before sintering in order to cause a bimodal pore size distribution, and particulates disposed on the glass beads may be added to alter surface activity.

Sintered glass bead filter with active microbial destruction

A method for producing a self decontaminating surface to decontaminate chemical and biological contaminants that are deposited on the surface and decontaminatable through reaction with free hydroxyl radicals. The method first includes determination of a surface to be treated and which is exposable to ultraviolet light. Second, a coating of nanoparticles of a transition metal oxide, non-limitedly exemplified by anatase titanium dioxide, is applied to the chosen surface. Application of the coating is accomplished by spraying heated nanoparticles or clusters thereof from a feed stock onto the surface to form a nanoparticle coating, with the nanoparticles being at a temperature of at least about 750&deg; C. upon exit from a spray apparatus and of a size between about 5 nm and 100 nm. Finally, the treated surface is exposed to ultraviolet light and water moisture, either naturally from the environment or artifically, to thereby catalytically form free hydroxyl radicals that thereafter react with the contaminants to render them generally harmless.

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Northport, NY, United States of America

Donald DiMarzio