195 results about "Length variation" patented technology

A Synchronous DRAM memory test assembly that converts a normal PC or Workstation with a synchronous bus into a memory tester. The test assembly may be split into two segments: a diagnostic card and an adapter card to limit mechanical load on the system socket as well as permit varying form factors. This test assembly architecture supports memory bus speeds of 66 MHz and above, and provides easy access for a logic analyzer. The test assembly supports Registered and Unbuffered Synchronous DRAM products. The test assembly permits good and questionable synchronous modules to be compared using an external logic analyzer. It permits resolution of in-system fails that occur uniquely in system environments and may be otherwise difficult or impossible to replicate. The test assembly re-drives the system clocks with a phase lock loop (PLL) buffer to a memory module socket on the test assembly to permit timing adjustments to minimize the degradation to the system's memory bus timings due to the additional wire length and loading. The test assembly is programmable to adjust to varying bus timings such as: CAS (column address strobe) Latencies and Burst Length variations. It is designed with Field Programmable Gate Arrays (FPGAs) to allow for changes internally without modifying the test assembly.

The invention discloses a fiber bragg grating array-based phase-sensitive optical time domain reflection device and method. The device includes a light source, a laser frequency adjustment module, a modulator, an optical fiber amplifier, a circulator, a sensing optical fiber, a light detector, a data acquisition module and a data processing module; the sensing optical fiber is provided with an optical fiber array formed by a plurality of FBGs (fiber bragg grating) which are arranged equidistantly; the laser frequency adjustment module is used for frequency adjustment of continuous light emitted by the light source; the continuous light is modulated by the modulator so as to form pulsed light; the optical fiber amplifier performs power amplification on the pulsed light; the sensing optical fiber is used for receiving and transmitting the pulsed light which has been subjected to power amplification; the light detector receives scattered light and reflected light; the scattered light and reflected light are acquired by the data acquisition module; and the data processing module generates interference signal frequency response spectrum and obtains the length variation quantity of the sensing optical fiber between two adjacent FBGs through processing. With the fiber bragg grating array-based phase-sensitive optical time domain reflection device and method of the invention adopted, strain quantitative detection can be realized, and high-spatial resolution measurement can be realized based on quantitative analysis.

The invention discloses a novel Fabry-Perot interference MEMS (Micro Electro Mechanical System) sound wave sensor, which comprises a collimator, an SOI (Silicon on Insulator) wafer and a bushing, wherein the bushing is arranged below the SOI wafer and is used for supporting the SOI wafer and fixing the collimator; the SOI wafer is provided with a sound-sensitive film; the central axis of the bushing is coincided with the central normal of a circular silicon film on the SOI wafer; the end face of the optical fiber collimator inserted into the bushing is 100-300 microns away from the sound-sensitive film. According to the novel Fabry-Perot interference MEMS sound wave sensor, the end face of the optical fiber collimator provided with a tail fiber and the inner surface of a silicon micro film construct two parallel surfaces of a Fabry-Perot interferometer, and the film is deformed when pressure generated by external sound waves is applied to the film, so that the cavity length of an Fabry-Perot interference cavity is changed. The detection of sound wave signals is realized by modulating the length variation of the F-P cavity, so that a micro microphone with high interference resistance and high sensitivity is provided for use in an environment with strong electromagnetic interference.

A clipping cover for the assembling of a bicycle handle accessories that is disposed on the front stem of a bicycle, wherein the clamp mount crown has a clamp ring at both the left and right sides of its lower extremity and an elongate tab at both the left and right sides of its upper extremity. Thus, when the stem clamp mount and clamp mount crown are utilized to secure various shaped handlebars into position, the two elongate tabs and clamp rings of the clamp mount crown respectively enable the installation of two forearm support base connecting bar assemblies and two accessory handlebars such that the connecting bars below the accessory handlebars and forearm support base are movable forward and backward to effect adjustment. As such, the clamp mount crown provides for accessory installation as well as direction and length variations according to rider requirements to achieve the best grasping posture.

The invention relates to a magnetic induction intensity sensing head and a magnetic induction intensity measurement method and a device thereof; and the invention is characterized in that a magnetic field sensing head is placed in a magnetic field to be measured, and a fiber bragg grating FPI adhered on magnetostrictive materials senses ambient temperature, offset magnetic field, modulated magnetic field and the magnetic field to be measured. A light signal emitted by a monochromatic light source enters fiber bragg grating F-P cavity and forms a similar two beam interference signal after interference to be output. Cavity length variation amount of the fiber bragg grating F-P cavity is obtained according to the two beam interference signal, and measurement value is obtained according to linear relation of the cavity length variation amount and magnetic field intensity. And finally, compensation relation between the magnetic field intensity measurement value and actual value to be measured on temperature and relation of the magnetic filed intensity and the magnetic induction intensity are utilized to obtain actual value of the magnetic induction intensity. The invention can measure both direct current magnetic field and alternate current magnetic field and has higher sensibility of measurement towards a weaker magnetic field.

A method of creating ultra tin body fully-depleted SOI MOSFETs in which the SOI thickness changes with gate-length variations thereby minimizing the threshold voltage variations that are typically caused by SOI thickness and gate-length variations is provided. The method of present invention uses a replacement gate process in which nitrogen is implanted to selectively retard oxidation during formation of a recessed channel. A self-limited chemical oxide removal (COR) processing step can be used to improve the control in the recessed channel step. If the channel is doped, the inventive method is designed such that the thickness of the SOI layer is increased with shorter channel length. If the channel is undoped or counter-doped, the inventive method is designed such that the thickness of the SOI layer is decreased with shorter channel length.

An optical imaging device includes a reference scanning unit offering a high signal-to-noise ratio and capable of scanning an object rapidly. An interference optical system can be realized inexpensively. In the optical imaging device, low coherent light passed through an optical coupler and another optical coupler, irradiated from an optical scanner probe, reflected from an observed point in a living tissue, returned to the optical coupler, propagated over a fourth SM optical fiber, and routed to another optical coupler shall be referred to as sample light. Light passed through an optical length variation optical system via the optical coupler and routed to the optical coupler shall be referred to as reference light. At this time, a difference between a delay time undergone by the sample light and a delay time undergone by the reference light is proportional to a difference between an optical length for the sample light and an optical length for the reference light. When the optical length difference falls within a coherence length, the sample light and reference light interfere with each other. An interfering signal is acquired into a computer through detectors, a differential amplifier, a demodulator, and an A / D converter.

The invention discloses an anti-shaking control method for a container shore bridge hanger. When the hanger is lifted, an anti-shaking controller acquires parameters of trolley speed, trolley position, hanger lifting speed, hanger swing length and hanger swing angle acquired by corresponding sensors and converted in real time, and the anti-shaking controller compares the swing angle of the hanger with a preset value and performs the following anti-shaking control when the swing angle is greater than the preset value: the anti-shaking controller selects a control model and a swing length representative value corresponding to a judgment interval according to the judgment interval of the hanger swing length or the swing length variation, and the anti-shaking controller calculates the trolley speed regulating parameter according to the swing length representative value and the real-time acquired hanger swing angle parameter under the selected control model and then provides a speed regulating signal for a trolley travelling controller to perform trolley acceleration so as to inhibit the swing angle of the hanger to realize anti-shaking control.

Two-layered or three-layered polymer tubing for use as a pressurized fluid conduit in automobiles can be either walled or have walls continuously or partially corrugated. The tubing has an outer layer of a hard polymer molding material and an inner layer of a soft rubber-like polymer or a polymer mixture. The inner layer can be provided on the innerside with a layer of a thermoplastic adhesion-modified elastomer composition. The a materials are selected for the layers to provide a so-called “hard-soft-combination”. The rubber-like polymer composition has a hardness in the range of 30 Shore A to 60 Shore D, especially of about 30 Shore A to 90 Shore A, the compositions being selected so that they are processable by coextrusion or the so-called conex method and adhere directly to each other non-positively or positively fitted, i. e. without additional bonding agent, without delaminating.

The invention discloses an umbrella type wind power device which comprises an acting rope, a control cabinet, a sliding drum, an acting umbrella, a balancing device, a plurality of thin ropes and an umbrella control rope, wherein the acting rope forms a certain angle with the ground surface; the control cabinet, the sliding drum, the acting umbrella and the balancing device are connected on the acting rope in sequence from bottom to up, and the control cabinet is fixed on the acting rope and is wirelessly connected with a central controlling device; the plurality of thin ropes are connected between the umbrella type edge of the acting umbrella and the sliding drum; and the umbrella controlling rope is connected between the control cabinet and the sliding drum, and the extending length variation of the umbrella controlling rope is controlled by the control cabinet. The invention also discloses a wind power system which is realized by the umbrella type wind power device. In the invention, as the umbrella controlling rope and the acting rope are controlled separately, the control on the umbrella type wind power device is more easier, the folding and unfolding of the acting umbrella can not influence the stability of an aerial balancing system, the aerial part of the wind power system disclosed by the invention has good stability and control performance, and the stability of acting mechanical transferring power of a ground part is improved greatly.

A device structure with multiple layers of low temperature epitaxy is disclosed that eliminates source and drain and extension implants, providing a planar interface with abrupt junctions between epitaxial extensions and substrate, mitigating electrostatic coupling between transistor drain and transistor channel and reducing short channel effects. The reduction of channel doping results in improved device performance from reduced impurity scattering and reduction of random dopant induced threshold voltage variations (sigma-Vt). Avoiding implants further reduces device sigma-Vt due to random dopants' diffusion from source and drain extensions, which creates device channel length variations during thermal activation anneal of implanted dopants. The defined transistor structure employs at least two levels of low-temperature epitaxy, and creates a planar interface with various types of transistor substrates resulting in performance improvement. Mixed epitaxial layer growth materials inducing tensile or compressive gate stresses can be advantageously used with the invention to further improve device characteristics.

A deployable reflector of the invention includes connection members that bridge plural extendable structures constituting a deployable truss structure and connect portions corresponding to nodes of a buckling mode occurring in the extendable structures when a surface cable system is given tension, with portions corresponding to antinodes thereof. The surface cable system includes an internal surface cable system and a circumferential surface cable system connected to the outer circumference thereof. A cable used for the internal surface cable system is high in stiffness and small in ratio of length variation to tension variation. A cable used for the circumferential surface cable system is lower in stiffness and smaller in ratio of the tension variation to the length variation than that used for the internal surface cable system. Given tension by the deployable truss structure via the circumferential surface cable system, the internal surface cable system forms predetermined surface shape.

The invention relates to a fiber bragg grating strain sensitivity calibration device and a method. The device comprises two sensor clamping device, a gas floating guide rail, a laser interferometry system, a fiber bragg grating demodulator and the like. The fiber bragg grating sensor is fixed through the two sensor clamping devices, and is driven by a micrometric displacement drive device to be installed on the sensor clamping devices on the gas floating guide rail to enable the sensor to generate tensile or compressive strain. Sensor length variation is measured through the laser interferometry system, fiber bragg grating sensor wavelength variation read by the fiber bragg grating demodulator is compared with the compressive strain, and fiber bragg grating strain sensitivity calibration is achieved. The fiber bragg grating strain sensitivity calibration device and the method uses the gas floating guide rail to guide the stretching and compression process of the fiber bragg grating, uses the laser interferometry system to measure the length variation of the fiber bragg grating sensor, and the fiber bragg grating sensor can be calibrated accurately without damage.

A system for providing signal trigger pulses comprises an equivalent time sampling unit providing transmit and receive trigger pairs, and a control unit controlling the equivalent time sampling unit to provide pseudorandom delay length variations between the trigger pairs.

A pipe lay vessel with a reel for carrying a length of pipe and first drive part for controlling rotation of the reel. A substantially vertical guide structure includes at its upper end a deflection member for deflecting the pipe from a first trajectory extending between the reel and the guide structure to a second, substantially vertical trajectory. A clamping member carries the vertical pipe section and has second drive for feeding the pipe along the vertical trajectory. A movable tension compensator (7) is provided at the first pipe trajectory for lengthening or shortening the first pipe trajectory to maintain a substantially constant tension of the pipe along the first trajectory during unwinding of the reel. By displacing the tension compensator, the first pipe trajectory can be lengthened or shortened to compensate for variations in speed due to non-uniform winding of the pipe and varying diameter of the spooled pipe and to compensate for sagging of the pipe due to its own weight and length variations upon unspooling in view of occuring plasticity and partial straightening of the pipe.

The invention relates to a high-speed demodulation device and method based on fiber fabry-perot cavity and fiber grating combined measurement. The high-speed demodulation device comprises a power supply module, a 3dB coupler, a circulator, a sensing unit and a demodulation unit. The high-speed demodulation method comprises that the relation among the demodulation error amount, the temperature variation and the pressure / strain variation of a fiber grating is obtained via calibration, and relation among the length variation of a fiber fabry-perot cavity, the temperature variation and the pressure / strain variation is obtained via calibration; the length variation of the fiber fabry-perot cavity and the drift amount of the wavelength of a reflection center of the fiber grating are modulated; and the temperature variation and the pressure / strain variation are solved. Compared with the prior art, double parameters can be measured via rapid demodulation on the basis of fiber fabry-perot cavity and fiber grating sensing, influence of fiber fabry-perot interference spectrum on temperature measurement caused by fiber grating modulation is compensated, and the cost is low.

A dendrometer comprises a dendrometer band whose length is extendable for encircling a tree trunk. The dendrometer further comprises an elongated electronic component that is closely or contiguously attached to the dendrometer band for moving along with the dendrometer band in order to follow length extension of the dendrometer band. Length variation of the dendrometer band is configured to be converted to electronic signals by the electronic component.

A rubber member conveying device and a rubber member supplying system having the same are provided. The device and the system rapidly promote the shrinkage of the rubber member, thereby avoiding the length variation of the rubber member in the processing step for the rubber member. A rubber member supplying system 10 comprises a belt conveyor 14 which supplies a to-be-cut material 12 having an internal strain, a cutter 16 which cuts the to-be-cut material 12 supplied by the belt conveyor 14 to form a rubber member 20, and a rubber member conveying part 24 which conveys the rubber members 20. The rubber member conveying part 24 comprises an endless belt 26, and rollers 28 supported by supporting parts 30 that are provided at the endless belt 26. The rubber member 20 is conveyed on the rollers 28 while exposed to vibrations. Accordingly, the shrinkage in the rubber member 20 caused by the internal strain thereof is substantially completed in the conveying operation.

A voltage detection terminal mounted to a housing plate body includes a bus bar connecting portion (4a) which is connected to a battery electrode and a bus bar (3) by bolt-nut connection, a detector connecting portion (4b) connected to voltage detector, and an interconnecting portion (4c) interconnecting the bus bar connecting portion and the detector connecting portion. A gap (c) for absorbing a length variation of a battery cell is formed between the plate body and the bus bar connecting portion, and the interconnecting portion (4c) includes a slanting portion (4c) for preventing the interconnecting portion from interference with the bus bar is formed at part of the interconnecting portion.

The invention provides a motion planning and control method of a parallel connection mechanical arm. The method comprises the following steps of 1, planning the expected motion track of a tail end executer of the parallel connection mechanical arm; 2, calculating a corresponding parallel mechanism arm speed layer kinematics relationship expression according to a concrete parallel connection mechanical arm parameter; 3, building an error function on the basis of the first step and the second step, and calculating the corresponding length variation rate of each driving rod through combining the kinematics; 4, transmitting the result solved in the third step to a lower computer to drive the mechanical arm to move. The method has the advantages that the problem that the parameter is difficult to determine in the prior art is solved; in addition, the tracks of the tail end executer can be effectively controlled; the operability is high; good application prospects are realized in the engineering field.

The invention provides a system for controlling the position of a lifting hook of a crane. The control system comprises a length variation detecting unit and a lifting hook lifting control unit, wherein the length variation detecting unit comprises a length judging unit and / or a command judging device; the length judging unit is used for detecting the real-time length of a telescopic arm and judging whether the acquired real-time lengths of the telescopic arm are the same or not, and confirming the length variation of the telescopic arm when the acquired real-time lengths of the telescopic arm are not the same; the command judging device is used for detecting whether the driving device receives a corresponding driving command or not, and confirming the length variation of the telescopic arm when the driving device receives the corresponding driving command; and the lifting hook lifting control unit is used for controlling the lifting of the lifting hook when the length of the telescopic arm changes, so that the lifting hook is in a pre-set safe height range. According to the other side of the invention, the invention further provides a method for controlling the position of the lifting hook of the crane as well as the crane. According to the technical scheme of the invention, the lifting hook can be adjusted intelligently according to the length of the telescopic arm, so as to improve the operation efficiency and reduce potential safety hazard during expansion and contraction processes.

A form, position and dimension measuring method of a blisk blade and a tool thereof are disclosed. The measuring method comprises the following steps: (1) taking an arc circumferential surface of blisk as a measuring reference surface, selecting any point on a blade top type surface as a measuring point, measuring a distance variation of the point relative to a normal direction of the measuring reference surface so as to obtain a position variation of a blade; (2) taking an arc end surface of the blisk as the measuring reference surface, selecting any point on the blade as the measuring point, measuring the distance variation of the point relative to an axial direction of the measuring reference surface so as to obtain a blade length variation. The invention provides the form, position and dimension measuring method of the blisk blade and the tool thereof. Intake and exhaust edge dimension change of the blade and a blade deformation situation can be real-timely monitored. Under the current condition, the real-time monitoring is performed inconveniently; a detection period is long; efficiency is low and cost is high. By using the method and the tool of the invention, the above problems can be solved.

A voltage detection terminal includes a bus bar connecting portion which is connected to a battery electrode and a bus bar by bolt-nut connection, a detector connecting portion connected to voltage detector, and an interconnecting portion interconnecting the bus bar connecting portion and the detector connecting portion. A gap for absorbing a length variation of a battery cell is formed between a plate body and the bus bar connecting portion, and a slanting portion for preventing the interconnecting portion from interference with the bus bar is formed at part of the interconnecting portion.

The invention provides a comprehensive-conventional mechanical mining double-unit face coal mining method under complicated geological conditions. Directed at mining of coal resources in irregular sections under complicated geological conditions, the method includes: arranging an equal length comprehensive mechanical mining face on the upper part of a coal briquette in a section, arranging an unequal length conventional mechanical mining face on the lower part of the coal briquette according to the remaining coal briquette shape in the section, making use of three section drifts to prepare two stope faces so as to form a double unit mining form between the equal length comprehensive mechanical mining face and the unequal length conventional mechanical mining face, advancing the two faces in a coordinated way, and always keeping the conventional mechanical mining face ahead of the comprehensive mechanical mining face by 5m, and when the length of the conventional mechanical mining face varies, increasing or decreasing the number of single hydraulic props and articulated roof beams in the conventional mechanical mining face or properly adjusting the prop space based on required support density so as to adapt to the face length variation. The method provided in the invention achieves arrangement of the equal length comprehensive mechanical mining face during irregular coal briquette mining under complicated geological conditions, simultaneously recovers coal resources to the utmost, and improves the mechanization level of coal mining under complicated geological conditions.

The invention is used in a communication system with at least two layers of retransmission control function. It comprises: deciding the length of PDU generated by an upper retransmission layer is changed; setting a length indication domain in lower retransmission control PDU; transmitting lower layer retransmission control PDU to the sending end. The invention also providing an apparatus thereof comprising: a comparison unit, a setting unit and a sending end.

The invention relates to a thermo-compensation current sensing head as well as an alternate current measurement method and a system thereof. A current sensing head is placed in a magnetic field generated by alternate current to be measured, and a fiber bragg grating FPI adhered on magnetostrictive material senses ambient temperature and magnetic induction. A light signal emitted by a monochromatic light source enters fiber bragg grating F-P cavity of a fiber bragg grating Fabry-Perot interferometer and forms a similar two beam light interference signal after interference to be output. Cavity length variation amount of the fiber bragg grating F-P cavity of the fiber bragg grating Fabry-Perot interferometer is obtained according to the two beam interference signal, and then alternate current measurement value is obtained according to the cavity length variation amount. And finally, compensation relation between current measurement value and actual value to be measured on temperature is utilized to obtain alternate current actual value. The performance of an original current sensor is improved, preparation technology is relatively simple, and simultaneous measurement of temperature and alternate current can be realized.

In sophisticated transistor elements, enhanced profile uniformity along the transistor width direction may be accomplished by using a gate material in an amorphous state, thereby reducing channeling effects and line edge roughness. In sophisticated high-k metal gate approaches, an appropriate sequence may be applied to avoid a change of the amorphous state prior to performing the critical implantation processes for forming drain and source extension regions and halo regions.