General Electric Company

Momentive Performance Materials Gmbh

Nicole Andrea Evers

Mark Philip D'Evelyn

Janos Gyorgy Sarkozi

Kanin Chu

An-Ping Zhang

Steven Francis LeBoeuf

Jesse Berkley Tucker

Jeffrey Bernard Fedison

Xian-an Cao

Mark Phillip D'Evelyn

There is provided an electronic device. The electronic device includes at least one epitaxial semiconductor layer disposed on a single crystal substrate comprised of gallium nitride having a dislocation density less than about 10per cm. A method of forming an electronic device is also provided. The method includes providing a single crystal substrate comprised of gallium nitride having a dislocation density less than about 10per cm, and homoepitaxially forming at least one semiconductor layer on the substrate.

Homoepitaxial gallium-nitride-based electronic devices and method for producing same

A photodetector () comprising a gallium nitride substrate, at least one active layer () disposed on the substrate (), and a conductive contact structure () affixed to the active layer () and, in some embodiments, the substrate (). The invention includes photodetectors () having metal-semiconductor-metal structures, P-i-N structures, and Schottky-barrier structures. The active layers () may comprise GaAlInNPAs, or, preferably, GaAlN. The gallium nitride substrate comprises a single crystal gallium nitride wafer and has a dislocation density of less than about 10cm. A method of making the photodetector () is also disclosed.

Homoepitaxial gallium nitride based photodetector and method of producing

A technique for detecting defects in aircraft wiring, such as for detecting partial discharges or arcing in wiring or cables is disclosed. A high frequency current transformer (HFCT) is fixingly positioned in contact with a wire so that the wire is encircled by the HFCT. Partial discharges from a damaged wire so encircled will induce a current in the HFCT proportional to the current of the discharge. The HFCT includes a conductive coil-like pattern formed onto a flexible insulating material. The insulating material has slits between each coil-turn. The HFCT also includes a core of flexible material fitted between the coil-turns through the slits.

Current transformers for partial discharge detection on aircraft cables and wires

A cable, system and method for detecting partial discharges or arcing in wiring or cables via fiber optics are provided. The cable for detecting partial discharges includes a conductor for carrying electrical signals; at least one fluorescent optical fiber for detecting light generated by a partial discharge; and a first transparent layer surrounding the conductor for supporting the at least one fluorescent optical fiber generally parallel to the conductor. By employing a fluorescent optical fiber, incident light generated by a partial discharge along a length of the optical fiber will be transmitted via the optical fiber to an optical receiver for determining a partial discharge has occurred.

Detection of partial discharge or arcing in wiring via fiber optics

A light emitting device, such as a light emitting diode or a laser diode. The light emitting device comprises a light emitting semiconductor active region disposed on a substrate. The substrate comprises an optical absorption coefficient below about 100 cmat wavelengths between 700 and 465 nm a GaN single crystal having a dislocation density of less than 10per cmand an optical absorption coefficient below about 100 cmat wavelengths between 700 and 465 nm. A method of making such a light emitting device is also provided.

Homoepitaxial gallium-nitride-based light emitting device and method for producing

A system and method for detecting partial discharges or arcing in wiring or cables is disclosed. The system employs a high-voltage AC power source to generate a high-voltage low-current AC waveform, which is propagated through a selected wire, which in turn, produces the return signal. The return signal is processed using a signal processor and the analyzed for indications of the occurrence of a partial discharge. The method detects damage to a selected wire by utilizing high voltage, low current AC waveforms to induce partial discharges in a controlled manner and detecting a return signal resulting from the discharge.

Low current AC partial discharge diagnostic system for wiring diagnostics

A light emitting device comprised of a light emitting semiconductor active region disposed on a substrate comprised of GaN having a dislocation density less than 10per cmis provided.

A photodetector comprising a gallium nitride substrate, at least one active layer disposed on the substrate, and a conductive contact structure affixed to the active layer and, in some embodiments, the substrate. The invention includes photodetectors having metal-semiconductor-metal structures, P-i-N structures, and Schottky-barrier structures. The active layers may comprise Ga Al In N P As , or, preferably, Ga Al N. The gallium nitride substrate comprises a single crystal gallium nitride wafer and has a dislocation density of less than about 10 cm . A method of making the photodetector is also disclosed.

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Niskayuna, NY, United States of America

Nicole Andrea Evers