1639 results about "Single-core" patented technology

The present invention is directed toward a fiber optic position and shape sensing device and the method of use. The device comprises an optical fiber means. The optical fiber means comprises either at least two single core optical fibers or a multicore optical fiber having at least two fiber cores. In either case, the fiber cores are spaced apart such that mode coupling between the fiber cores is minimized. An array of fiber Bragg gratings are disposed within each fiber core. A broadband reference reflector is positioned in an operable relationship to each fiber Bragg grating wherein an optical path length is established for each reflector/grating relationship. A frequency domain reflectometer is positioned in an operable relationship to the optical fiber means. In use, the device is affixed to an object. Strain on the optical fiber is measured and the strain measurements correlated to local bend measurements. Local bend measurements are integrated to determine position or shape of the object.

A method of providing multicast routing for use in ad hoc broadcast networks, such as wireless and mobile networks. The method is described within a protocol referred to as core-assisted mesh protocol, or CAMP. The method departs from traditional tree-structured multicast protocols and utilizes multicast meshes in which the network need not be flooded with control or data packets to establish routing paths. Each router configured for CAMP is capable of accepting unique packets arriving from any neighbor in the mesh, wherein packets are forwarded along reverse shortest paths to the receiver. Multiple cores may be defined for a group wherein the loss of a single core does not prevent packet flow. Routers for sender-only hosts are allowed to join the multicast mesh in simplex mode, and in certain cases may join without the sending of a join request.

The present invention is directed toward a fiber optic position and shape sensing device and the method of use. The device comprises an optical fiber means. The optical fiber means comprises either at least two single core optical fibers or a multicore optical fiber having at least two fiber cores. In either case, the fiber cores are spaced apart such that mode coupling between the fiber cores is minimized. An array of fiber Bragg gratings are disposed within each fiber core and a frequency domain reflectometer is positioned in an operable relationship to the optical fiber means. In use, the device is affixed to an object. Strain on the optical fiber is measured and the strain measurements correlated to local bend measurements. Local bend measurements are integrated to determine position and/or shape of the object.

A non-invasive near infrared spectrophotometric monitoring transducer assembly includes a housing member, which is adhered directly on a patient's skin. The housing member contains a prism coupled to a flexible and lightweight single core optical light guide, which provides a means of transferring narrow spectral bandwidth light from multiple distant laser diodes of different wavelengths by use of a multi-fiber optic light combining assembly. Different wavelengths are needed to monitor the level of blood oxygenation in the patient. The assembly also contains a planar light guide mounted on the prism located in the housing member, which light guide contacts the patient's skin when the housing member is adhered to the patient's skin. The light guide controls the spacing between the prism and the patient's skin, and therefore controls the intensity of the area on the patient's skin which is illuminated by the laser light. The housing member contains a photodiode assembly, which detects the infrared light at a second location on the skin to determine light absorption. The photodiode assembly is preferably shielded from ambient electromagnetic interference (EMI) by an optically transparent EMI attenuating window. This rigid window placed over the photodiode also provides a planar interface between the assembly and the skin, improving optical coupling and stability as well as reducing the capacitive coupling between skin and the photodiode resulting in further EMI attenuation. The housing may be associated with a disposable sterile hydrogel coated adhesive envelope, or pad, which when applied to the patient's skin will adhere the housing to the patient's skin. The transducer assembly will thus be reusable, and skin-contacting part of the device, i.e., the envelope or pad can be discarded after a single use. The assembly also includes a laser safety interlock means, which is operable to turn off the laser light output in the event that the assembly accidentally becomes detached from the patient's skin.

Memory architecture provides capabilities for high performance content search. The architecture creates an innovative memory that can be programmed with content search rules which are used by the memory to evaluate presented content for matching with the programmed rules. When the content being searched matches any of the rules programmed in the Programmable intelligent Search Memory (PRISM) action(s) associated with the matched rule(s) are taken The PRISM content search memory is embedded in a single core or multi-core processors or in multi-processor systems to perform content search. PRISM accelerates content search by offloading the content search tasks from the processors. Content search rules comprise of regular expressions which are converted to finite state automata and then programmed in PRISM for evaluating content with the search rules.

Provided is a method for preparing uniformly sized and shaped, mono-dispersed microcapsules using miniemulsion polymerization. In microcapsules prepared by the method, a liquid or solid core encapsulated by a polymer shell has 10 to 80% by volume of the microcapsules. Since miniemulsion particles produced at an early stage of the method are stable, an organic material which is well dissolved in monomer particles and has a higher interfacial tension with water, relative to the polymer shell, can be uniformly positioned in polymer particles. Furthermore, when a crosslinking agent is added during the polymerization, single-core microcapsules can be obtained. In addition, use of an oil-soluble initiator can prevent formation of secondary particles and addition of a secondary initiator during the polymerization can increase the yield of the uniformly sized and shaped microcapsules.

The invention relates to the field of detection on an earth fault of a sheath of a single-core power cable, in particular to a system and a method for detecting the earth fault of the sheath of the single-core power cable on the basis of circulation measurement. Circulation detection is carried out on the sheath of the cable in three earthing modes of single-end earthing, double-end earthing and cross interconnection earthing. Firstly, transformation of additionally arranged switching elements for various earthing boxes of the cable is carried out, so that each earthing mode can be conveniently and safely converted into the single-end earthing mode in the measuring process; then in the state, a circulation value of the sheath is measured; and according to a circuit theory model of a fault sheath circulation loop and experimental data in the single-end earthing mode, circulation characteristics at different fault earthing points are obtained so as to carry out fault judgment and positioning. In the whole process, the detection is simple, the calculated amount is small, and online detection can be realized.

The invention discloses a single-core and multi-core fiber coupler and fiber access into rafah cone coupling method. It peels the ending coating layer of a single-core optical fibers and a multi-core fiber, direct financial with the fiber welding machine in stripping department, received and in the implementation of solder joint heating department fused biconical taper, monitoring optical power, when cone waist rafah small cone of light power distribution to the target, spectrophotometer stopping widening cone. The method is the technical characteristics of single-core fiber and multi-core fiber fusion welding, the solder joint implemented fused biconical taper, thus forming a cone of light energy distribution, optical power of distribution. The method can be single-core optical fiber distribution of power coupled multi-core optical fiber to each core, or multi-core fiber coupling of light waves to single-core fiber, to achieve optical spectrophotometer and cooperation functions.

The invention relates to the communication technology field, especially relates to two-core control mirror backup method. The method adopts the mechanism of the mirror heat backup, the core service allocates two independent mirror services, and it stores the control data for the core service and provides the data analysis and data acquisition for the core service, and at the same time, it shares the data service of core service to reduce the work of core service. In the system without adopting two-core backup system, when the single core control sever happens fault and refresh resetting, it can obtain the running information from the mirror service to keep the system running cautiously. For the non-core control module, if it needs heating backup or sharing load, the main core service coordinate and control it. The invention adopts the mirror service to help the core service to finish the data backup and data analysis to improve the reliability and the flexibility of whole system.

The invention provides a JTAG (joint test action group) debug method of a multi-core processor. A multichannel test interface controller is connected between a standard test access port controller and a simulator JTAG debug interface of every processor core. The debug method comprises the following steps that: firstly, a system is electrified, and the functional state machine of the multichannel test access port controller enters the state of test logic reset; secondly, a debug command is sent, and specific TCK (testing clock), TDI (testing data input) and TMS (testing method select) signals are output through the simulator JTAG debug interface, so that state control modules enter states in sequence; thirdly, selective signals are sent, and a control register is configured; fourthly, after one-clock cycle of delay, the information in the control register is loaded to a state register; and fifthly, after finishing the selection of the processor cores, the debug command is sent, and the debug procedure of a single-core processor is carried out. The invention effectively completes the selection and the control of every processor core and the storage and the feedback of debug information, so that the reliability is promoted.

The present invention discloses a DC curren sensor. In said sensor a detection coil is added, said sensor adopts single-core three-winding structure, when a DC bias magnet is existed in the magnetic core, the induced potential obtained by detection coil can produce positive-negative half-wave unsmmetrical waveforms, said waveforms can be converted into the voltage signal of difference of positive-negative half-wave effective values, after voltage/current conversio, said signal can be fed into feedback winding, said feedback winding cap produce the DC magnetic potential whose direction is opposite to that of magnetic patential produced by detected direct current to balance the bias magnetic potential produced by detected direct current to form 'null-flux' state, so that it can obtain the detected direct current intensity so as to implement the detection of direct current.

The invention provides an optical micro-hand based on a three-core fiber and a method for preparing the same. The fiber comprises a three-core fiber and a single-core fiber which is in coupled connection with the rear of the three-core fiber and the connection between the three-core fiber and the single-core fiber is realized by applying heating, fusing and tapering the welding point after welding. The other end of the three-core fiber is made into a cone by sintering at the sharp end after grinding or heating the ends of the fiber and applying fusing and tapering. Aiming at the defect and deficiency in the prior art, the optical micro-hand discloses an optical micro-hand based on a three-core fiber which can form a cross combination light field by grinding or tapering the ends of the fiber based on the three-core fiber by making use of the joint action among external refraction, internal reflection and external refraction as well as a cone gradual wave guide and further form a three dimensional gradient force potential trough at the convergence point of combination light fields so as to realize three dimensional trapping of tiny particles.

The invention pertains to the pipeline monitoring technology, particularly a fiber pipeline monitoring system. The system is composed of an optical transmitter module, an optical interferometer module, a monitoring line, a modulator module, an optical receiver module and a signal processing module. The system can get two signals corresponding to different optical path positions of the same vibration though multiplexing a fiber interference system, compare the spectrum characteristics of the two signals, and eliminate the interference of the position information caused by the vibration information so as to obtain the accurate vibration position information under the condition that the system adds no photoelectric detector. The position information is obtained through the medium value of the spectrum amplitude ratio of the two signals, and the difference caused by the instability of the detection signal is eliminated, thus the accuracy of the location is greatly improved. The location function is realized with single-core fiber under the condition of not constituting a loop, thus the location monitoring can be realized by paving equal-distance main line along the petroleum pipe line, which has strong environmental applicability.

In a state in which a front end of a single-core fiber is passed through an end surface portion of a reinforcing pipe, an inner surface of the reinforcing pipe and an outer peripheral surface of the single-core fiber are glued together by means of adhesive. By using the same adhesive, an adhesive portion is formed by curing it so as to protrude and taper from the end surface portion of the reinforcing pipe toward the front end of the single-core fiber. Thereafter, a coated optical fiber formed with the adhesive portion is inserted in a ferrule until an end surface portion of the coating of the single-core fiber abuts against the first tapered hole and until the end surface portion of the reinforcing pipe abuts against the second tapered hole. Then, the optical fiber is glued in the ferrule by means of adhesive.

The invention relates to a real-time on-line monitoring apparatus of blade vibration of a flue gas turbine. The monitoring apparatus comprises blade tip timing sensors, an angle reference sensor, a rotating speed synchronization sensor, a preprocessing system, a data integrated processing card, and a computer. The blade tip timing sensors, the angle reference sensor, and the rotating speed synchronization sensor are connected with the preprocessing system that is connected with the data integrated processing card; and the data integrated processing card is connected with the computer. According to the invention, the sensors employ double-shielded capacitance impulsers; single-core double-shielded wires are utilized as transmission lines of output signals; and a driving cable technology is utilized to effectively reduce a random error introduced by an environmental interference; and a charge amplification circuit is used to extract a capacitance pulse signal, thereby eliminating the system error basically and improving the measurement accuracy of the system.

Magnetic components that can be used to provide normal mode and common mode inductance in a power system, such as a wind-driven doubly fed induction generator system, are provided. The magnetic components can include a structure that combines both normal mode inductors and common mode inductors on a common core. In particular, the magnetic components can include specific winding and core arrangements which couple a common mode inductor and a normal mode inductor onto a single core with at least three legs. The structure of the magnetic components can be smaller in size, can have lower weight, and can have a lower cost than typical solutions to providing common mode and normal mode inductance in a power system.