Abstract:
A multiple sensor fiber optic sensing system includes an optical fiber having at least first fiber optic sensors and second fiber optic sensors deployed along its length. In response to an interrogating pulse, the first fiber optic sensors generate responses in a first optical spectrum window, and the second fiber optic sensors generate responses in a second, different optical spectrum window. The responses in the first optical spectrum window are measured in a first optical spectrum channel, and the responses in the second optical spectrum window are measure in a second, different optical spectrum channel and provide simultaneous indications of one or more parameters, such as temperature and pressure, in the environment in which the sensors are deployed.
Abstract:
Systems and methods for optically determining casing collar and/or corrosion locations within boreholes, using the diffraction effect of Faraday crystals through which depolarized continuous light is transmitted within optical fibers.
Abstract:
Configurations for stationary imaging systems are provided. The configurations may include combinations of various types of distributed sources of X-ray radiation, which generally include addressable emitter elements which may be triggered for emission in desired sequences and combinations. The sources may be ring-like, partial ring-like, or line-like (typically along a Z-axis), and so forth. Combinations of these are envisaged. Corresponding detectors may also be full ring detectors or partial ring detectors associated with the sources to provide sufficient coverage of imaging volumes and to provide the desired mathematical completeness of the collected data.
Abstract:
There is provided a field emitter device formed over a semiconductor substrate. The field emitter device includes at least one field emitter tip disposed over the substrate, and a conducting gate electrode layer disposed over the substrate. The field emitter device also includes a protective electronic component disposed over and integral to the substrate and electrically connecting the conducting gate electrode layer to the substrate such that if the conducting gate electrode layer experiences a voltage greater than a breakdown voltage of the field emitter device, the protective electronic component conducts current between the conducting gate electrode layer and the substrate.
Abstract:
Methods and apparatus for creating a velocity profile of a formation surrounding a borehole by checkshot measurements while moving the tool along the borehole. A conveyance and a sensor section are configured to move the sensor section in the borehole. At least one receiver is configured to detect signals generated at or near the surface while the sensor section is moving in the borehole.
Abstract:
A focal track region of an x-ray anode in an example is electrochemically etched. In a further example, an x-ray anode comprises a thermally-compliant focal track region for impingement of electrons from an x-ray cathode to create an x-ray source. The thermally-compliant focal track region comprises a pattern of discrete relative expanses and gaps.
Abstract:
A system and method for forming x-rays. One exemplary system includes a target and electron emission subsystem with a plurality of electron sources. Each of the plurality of electron sources is configured to generate a plurality of discrete spots on the target from which x-rays are emitted. Another exemplary system includes a target, an electron emission subsystem with a plurality of electron sources, each of which generates at least one of the plurality of spots on the target, and a transient beam protection subsystem for protecting the electron emission subsystem from transient beam currents, material emissions from the target, and electric field transients.
Abstract:
A surface vessel capable of lowering a sealed passenger hull into the water and moving the passenger hull through the water for the purpose of conducting an underwater tour. The vessel is equipped with the means to lower and raise the passenger hull vertically such that the center of buoyancy of the vessel and the center of gravity of the vessel remain aligned relative to the force of gravity. The passenger hull is supplied with fresh air from the surface and expels spent air back to the surface thereby maintaining normal atmospheric pressure within the passenger hull. The vessel contains ballast tanks capable of taking on seawater, when the passenger hull is in a raised position. The water ballast being used to offset the buoyancy of the passenger hull as well as increasing the stability of the vessel, when the passenger hull is in its lowered position. Before resuming normal surface operation seawater is discharged from the ballast tanks, utilizing the buoyancy of the passenger hull, while the passenger hull is still below the water surface and not yet in the fully raised position.
Abstract:
A method and apparatus for deploying seismic detectors and monitoring seismic activity associated with a production well from a down hole location within a well.
Abstract:
A sonde and an apparatus for the deployment thereof against a well casing is described, the sonde comprising a resilient C-shaped member and at least one sensor.