摘要:
A process for producing a pattern in the surface coating of an electrode used in an electrochemical machining process comprises the steps of providing a cylinder having a body composed of an electrically conductive material and a surface coating of an electrically insulating material and exposing the surface coating of the cylinder to a source of light in accordance with the pattern. Locators(s) may optionally be formed on the surface of the cylinder to assist in positioning the electrode in a predrilled hole.
摘要:
Disclosed is an optical device structure comprising a low shrinkage mixture wherein the shrinkage of the mixture is limited after the curing of the mixture during optical device formation. Disclosed also are methods for forming optical devices which comprise the low shrinkage mixture.
摘要:
A protective cap is deposited over the top and sides of an air bridge structure located on an integrated circuit chip. The protective cap provides mechanical strength during the application of a high density interconnect structure over the chips, to prevent deformation of the sensitive (air bridge) structure, and also to prevent any contamination from intruding under the air bridge. More importantly, the protective cap does not impede the performance of the air bridge and therefore does not need to be removed, thereby eliminating the necessity of ablating the HDI structure. Furthermore, the protective cap allows additional area for metallization to provide alternate circuits for coupling, power or ground planes, etc.
摘要:
In one aspect, the present invention provides a hermetically sealed fiber sensing cable comprising: a core fiber comprising at least one Bragg grating region, an outer surface and a length; a fiber cladding in contact with the core fiber along the entire length of the core fiber, the fiber cladding having an outer surface and a length; a carbon layer disposed upon the outer surface of the fiber cladding along the entire length of the fiber cladding, the carbon layer comprising diamond-like carbon; a hydrogen ion absorption layer in contact with the carbon layer, the hydrogen ion absorption layer being disposed on the outer surface of the carbon layer; and an outer sleeve. Also provided in another aspect of the present invention, is a component for a hermetically sealed fiber sensing cable.
摘要:
In one aspect, the present invention provides a hermetically sealed fiber sensing cable comprising: a core fiber comprising at least one Bragg grating region, an outer surface and a length; a fiber cladding in contact with the core fiber along the entire length of the core fiber, the fiber cladding having an outer surface and a length; a carbon layer disposed upon the outer surface of the fiber cladding along the entire length of the fiber cladding, the carbon layer comprising diamond-like carbon; a hydrogen ion absorption layer in contact with the carbon layer, the hydrogen ion absorption layer being disposed on the outer surface of the carbon layer; and an outer sleeve. Also provided in another aspect of the present invention, is a component for a hermetically sealed fiber sensing cable.
摘要:
A gas detection system is provided for identifying a gas. The gas detection system includes a sensing module with a hollow chamber enclosed by a chamber housing. Additionally, the sensing module includes an optical sensing fiber positioned within the hollow chamber. The optical sensing fiber includes a gas sensor including a fiber Bragg grating positioned at a grating location along the optical sensing fiber, and a sensing layer affixed to an exterior surface of the optical sensing fiber at the grating location. After the gas is directed into the hollow chamber, the sensing layer and the gas exchange heat energy, based in part on a heat transfer coefficient of the gas. The exchange of the heat energy induces a shift in a Bragg resonant wavelength of the fiber Bragg grating which exceeds a threshold shift required for detection, where the shift is used to identify the gas.
摘要:
A system is provided for monitoring a relative displacement of a pair of end-winding components. The system includes a structure mounted to the end-winding components at an angle with respect to the end-winding components for monitoring the relative displacement. The system further includes an optical fiber with a first portion including a fiber Bragg grating mounted to a surface of the structure to experience a strain resulting from a strain of the structure due to the relative displacement. The optical fiber includes a second portion internally routed through in the structure to the first portion mounted to the surface. The structure is configured so that the strain produced by the structure limits a magnitude of the strain of the fiber Bragg grating within a predetermined range over a span of the relative displacement of the end-winding components.
摘要:
A carbon dioxide (CO2) purity sensor package includes a fiber core, a periodic refractive index modulated fiber grating structure within the fiber core and a fiber cladding. A thermally conductive sensing layer is positioned about a portion of the fiber cladding surrounding the periodic refractive index modulated fiber grating structure. A gas chamber encloses the fiber cladding with the thermally conductive sensing layer.
摘要:
A system is provided for monitoring a relative displacement of a pair of end-winding components. The system includes a structure mounted to the end-winding components at an angle with respect to the end-winding components for monitoring the relative displacement. The system further includes an optical fiber with a first portion including a fiber Bragg grating mounted to a surface of the structure to experience a strain resulting from a strain of the structure due to the relative displacement. The optical fiber includes a second portion internally routed through in the structure to the first portion mounted to the surface. The structure is configured so that the strain produced by the structure limits a magnitude of the strain of the fiber Bragg grating within a predetermined range over a span of the relative displacement of the end-winding components.
摘要:
A wind anemometer comprises a light source for transmitting pulsed light signals, a receiver for receiving backscattered signals from airborne particles for each pulse of the transmitted pulsed light signals, a detector for detecting the received backscattered signals, and a processor to determine location of the airborne particles with respect to the anemometer based on the detected backscattered signals. The processor estimates wind velocity using changes in location of the airborne particles over at least one time interval.