242 results about "Displacement error" patented technology

An apparatus and method for EUV light production is disclosed which may comprise a laser produced plasma (“LPP”) extreme ultraviolet (“EUV”) light source control system comprising a target delivery system adapted to deliver moving plasma initiation targets and an EUV light collection optic having a focus defining a desired plasma initiation site, comprising: a target tracking and feedback system comprising: at least one imaging device providing as an output an image of a target stream track, wherein the target stream track results from the imaging speed of the camera being too slow to image individual plasma formation targets forming the target stream imaged as the target stream track; a stream track error detector detecting an error in the position of the target stream track in at least one axis generally perpendicular to the target stream track from a desired stream track intersecting the desired plasma initiation site. At least one target crossing detector may be aimed at the target track and detecting the passage of a plasma formation target through a selected point in the target track. A drive laser triggering mechanism utilizing an output of the target crossing detector to determine the timing of a drive laser trigger in order for a drive laser output pulse to intersect the plasma initiation target at a selected plasma initiation site along the target track at generally its closest approach to the desired plasma initiation site. A plasma initiation detector may be aimed at the target track and detecting the location along the target track of a plasma initiation site for a respective target. An intermediate focus illuminator may illuminate an aperture formed at the intermediate focus to image the aperture in the at least one imaging device. The at least one imaging device may be at least two imaging devices each providing an error signal related to the separation of the target track from the vertical centerline axis of the image of the intermediate focus based upon an analysis of the image in the respective one of the at least two imaging devices. A target delivery feedback and control system may comprise a target delivery unit; a target delivery displacement control mechanism displacing the target delivery mechanism at least in an axis corresponding to a first displacement error signal derived from the analysis of the image in the first imaging device and at least in an axis corresponding to a second displacement error signal derived from the analysis of the image in the second imaging device.

The invention discloses a method for measuring a geometric error parameter value of a rotary oscillation axis of a five-axis linkage numerical control machine tool. The method comprises the following steps of: measuring displacement errors of X, Y and Z directions on at least three positions under different rotating angles of the rotary oscillation axis respectively by using a ballbar, wherein translation axis linkage coordinates provided by a revolving tool central point (RTCP) cutter central point movement control function of a five-axis machine tool serve as measurement datum; and performing data processing according to the displacement errors to identify and calculate the geometric error of each rotating angle of the rotary oscillation axis. The rotary oscillation axis is measured independently by the method, so the geometric error value of the five-axis linkage numerical control machine tools of various structures at each rotary oscillation angles can be obtained. The method is not limited by the structures of the machine tools, is convenient to arrange and has high measuring precision.

The invention belongs to the technical field of navigation, and concretely relates to an inertial navigation/mileometer autonomous integrated navigation method. The method comprises the following steps: 1, initially aligning an inertial navigation system, and initializing parameters of a Kalman filter; 2, carrying out inertial navigation calculation to obtain a discrete state transfer matrix and a measurement matrix; 3, calculating based on the summation measurement of displacement errors to obtain a filtering observation; 4, carrying out mileometer information fault detection; 5, carrying out Kalman filtering; and 6, correcting. The method solves technical problems of too large mileometer quantification noise and reduced combination navigation precision of present inertial navigation/mileometer integrated navigation methods; and the method which adopts a displacement integration coupling based inertial navigation/mileometer integrated navigation strategy abandons a quantization noise introduced in the traditional methods utilizing a speed, which is obtained by performing calculation on a displacement, as an observation, and substantially improves the reliability of an integrated navigation system.

The invention relates to a high-precision moving robot positioning system and method. The system and the method are technically characterized in that a positioning controller of the system comprises a microprocessor, a coder, a gyroscope and a communication interface; the coder, the gyroscope and the communication interface are connected with the microprocessor; the microprocessor respectively reads angle data through the coder and the gyroscope, reads two-dimensional code images through a two-dimensional code reader and performs calculation to realize the positioning function. The method comprises the following steps that (1) the positioning controller integrally calculates the AGV(Automatic guided vehicle) angle change according to the weight of the coder and the gyroscope; (2) the positioning controller obtains the AGV angle and the position through the two-dimensional code reader, corrects the angle deviation of the gyroscope, and corrects the relative displacement errors of the coder. According to the through the method provided by the invention, the two-dimensional code reader, the coder and the gyroscope are organically combined, so that the AGV angle precision reaches +/-0.1 degree; the position precision reaches +/-0.2mm; the navigation precision is greatly improved; the influence of angle drift of the gyroscope and the displacement errors of the coder on the angle change can be avoided.

The invention provides an operation pointer indication control device based on a human eye image and sight tracking. The device can be worn on the head of a human body, and human-computer interaction can be achieved by means of operation control over an operation pointer through actions of eyes. In the interaction control process of the device, interference caused by a dark visible light environment and other situations can be avoided, a displacement error generated due to jittering can be relieved and even shielded, and the human-computer interaction effect that the indication position of the operation pointer and a real scene observed by human eye sight overlap is achieved. Thus, the human-computer interaction ability of a head-worn computer terminal is enhanced, and abundant operability and powerful expandability can be achieved. Consequently, the problem that in the prior art, popularization and application of the head-worn computer terminal in the technical field of industry and commerce are limited because the human-computer interaction ability of the head-worn computer terminal is limited is effectively solved, and the operation pointer indication control device has broad application prospect in the technical field of wearable computer terminals.

The invention relates to an axial circular runout and total runout single displacement error separation device and method, and belongs to the technical field of micro-nanometer ultra-precise measurement. In the method, an axial circular runout and total runout measurement device and an error separation system are organically integrated into a whole, a proper displacement angle alpha is selected in an error separation process, so that a workpiece performs a single small-angle displacement of a corresponding angle relative to a rotary main shaft, total harmonic separation of z(n) and g(n) in a harmonic range of between 1 and 100upr by measuring comprehensive errors A(n) and B(n) including a workpiece axial circular runout error g(n) and a main shaft rotary error z(n) before and after displacement of the workpiece, and utilizing fast Fourier series transform, harmonic analysis and other mathematic processing methods. According to the device and the system, when an existing error separation method is used for circular runout error separation, the defects that an error introduced by a rotary shaft cannot be completely separated, error separation time is long, various larger drifts are easily introduced and the like can be overcome, and the error separation device and the error separation process can be greatly simplified.

The present invention provides a method to calibrate an on-board remote sensing system using a self-locking travel pattern and target remote sensing data. The self-locking travel pattern includes a number of parallel travel lines having overlapping swath widths between adjacent travel lines. The overlapping swath widths are used to determine the boresight angles and range offset of the remote sensor device. In addition, the method can be used to generate estimated horizontal and vertical displacement errors. These estimated errors can be used as correction factors for the range offset and boresight angles.

The invention relates to a vane displacement error detection device of a multi-vane collimator. The vane displacement error detection device of the multi-vane collimator comprises a shell, a plurality of left vanes and right vanes, a lead screw I, a lead screw II, a motor I and a motor II, wherein the left vanes are installed at the left end inside the shell in a sliding mode through a sliding device, the right vanes are installed at the right end inside the shell in a sliding mode through a sliding device, the lead screw I is screwed on the left vanes, the lead screw II is screwed on the right vanes, and the motor I and the motor II are fixed to the left side and the right side of the shell respectively. Encoding signals of an encoder I and an encoder II are read and compared with the interval between an infrared laser sensor emitting end I or an infrared laser sensor emitting end III and an infrared laser sensor emitting end II, so that the differential value between the actual movement displacement amount of the vanes and the theoretical displacement amount output by a control system is obtained, and the vane displacement error detection device of the multi-vane collimator is simple in structure and convenient to operate. The practically obtained differential value is used for compensation accurately and reliably, and the problems that as the lead screws are abraded due to long-time operation, the return difference is too large and the return difference value can not be accurately measured are solved.

A pattern density distribution and a dose distribution calculated using the pattern density distribution are multiplied by each other to calculate an exposure distribution. A fogging electron amount distribution is calculated using the exposure distribution and a function descriptive of a fogging spread distribution. Charge amount distributions in irradiation and non-irradiation regions are calculated using the exposure distribution and the fogging electron amount distribution. A position displacement amount distribution is calculated using the charge amount distributions and a response function for converting a charge amount to a position displacement error.

The invention discloses an electromechanically-integrated cycloidalpin wheel drive device which comprises a cycloidalpin wheel speed reducer assembly, a high-speed cylindrical gear meshing pair, a servo motor, a speed and temperature sensor, a hollow input shaft and an output shaft with a flange. According to the invention, a planetary speed reducer assembly with three eccentric shafts, an external meshing gear pair, the servo motor and the sensor are integrated into a whole, a coupler is omitted, thus the electromechanically-integrated cycloidalpin wheel drive device has the advantages of compact structure, energy consumption reduction and reduced transmission angle and displacement error between the shafts and improved system precision. The sensor detects an operation state online and feeds back the operation state to a signal processing center, therefore accidents are immediately prevented and controlled. Therefore, the electromechanically-integrated cycloidalpin wheel drive device has the advantages of no need of replacement of lubricating agents, compact structure, strong instantaneity, long service life, high transmission efficiency, strong bearing capacity, low vibration, high precision, convenience for maintenance and the like, and can be widely applied to fields of robots, ships, vehicles and the like.

The invention discloses a helicopter rotor blade movement parameter measurement method based on vibration correction and belongs to the technical field of vision measurement. The helicopter rotor blade movement parameter measurement method based on vibration correction comprises the following steps of placing a certain number of coded mark points on a hub and blades of a helicopter rotor; constructing a binocular stereo vision system to obtain helicopter rotor image data; calculating three-dimensional coordinates of the coded mark points and constructing a rotor coordinate system; calculatinga transient vibration displacement vector of the rotor in a high speed rotation state to correct the three-dimensional coordinates of the coded mark points; and on the basis of the corrected three-dimensional information of the coded mark points, calculating movement parameters of the rotor blades in the current transient state according to definitions of the movement parameters of the rotor blades. The helicopter rotor blade movement parameter measurement method based on vibration correction, disclosed by the invention, has the advantages that the movement parameters of the rotor blades can be accurately measured by correcting vibration displacement errors caused by rotor high speed rotation, the operation is simple, the method is in the non-contact form, the accuracy is high, and the safety is good.

The invention relates to a circular grating installation error calibration and correction method based on a single reading head, relating to the precision machinery field and solving the problems that the conventional precision angle measurement cannot achieve low cost, high precision, high reliability, and high temperature adaptability. The method includes that a dial gauge is used to guarantee the circular grating installation displacement error is within 10[mu]m, a metal polyhedron and a high-precision autocollimator are adopted to carry out the multi-area calibration on the circumference angle measurement error caused by the displacement error, and the angle measurement error is corrected in real time by means of least squares polynomial curve fitting in the area. The error caused by the displacement can be directly converted to the circumference angle measurement error through the space coordinate transformation method, the error correction parameters can be fitted by means of a multi-area precision calibration method, the real-time correction can be carried out during the measurement, therefore, the installation requirement of circular gratings can be reduced, and the ideal angle measurement precision can be realized by the single reading head.

The invention discloses a continuous compensating method of the displacement precision of a digital controlled shaft of a digital controlled machine tool. The effective stroke of a digital controlled shaft is divided into a plurality of equal segments with A length by taking a reference point as an original point, the reference point is used as the boundary for dividing the effective stroke into positive sections and negative sections, the point of the positive sections is marked as p, the point of the negative sections is marked as p', the number of the positive sections is marked as n, and the number of the negative sections is marked as n'. The running of the digital controlled shaft along the direction leaving the reference point is defined as consequent running, and the running of the digital controlled shaft along the direction close to the reference point is defined as reversed running. The reference point is used as a starting point, and a laser interferometer is used for measuring the consequent and reversed error values delta p and delta p' of every section point of the digital controlled shaft corresponding to the reference point, and the displacement-error curve of the digital controlled shaft is acquired. The consequent and reversed error linear functions of every section are respectively established according to the measuring result. Unit conversion, data list preparation and compensation are respectively carried out. The continuous compensating method of displacement precision of the digital controlled shaft of the digital controlled machine tool can realize the positioning precision compensation of the digital controlled shaft, the error compensation of the moving track of the digital controlled machine tool and the section gap compensation of the digital controlled shaft.

The invention relates to a method for detecting a ship target position at a submarine cable zone, in particular to a data fusion position detection algorithm based on a radar target recognition technology and a shore-based ship automatic identification system. The method comprises firstly plotting a surrounding geographical situation on a radar chart by using shore-based radar position detection;confirming a dynamic target by filtering; tracking a heading and a polar coordinate position; fusing with target position information by time synchronization; correcting a radar-plotted target position by the ship position information received by a B-type shore-based AIS; predicting the heading and the speed of the ship at the next moment by target position detection; finally obtaining the real geographical position of the target; superposing the radar chart on an electronic chart, and drawing a submarine cable zone by using an electronic auxiliary navigation mark to ensure the safety of the submarine cable zone. The method, by using the instantaneity of the AIS position information and in combination with radar data comparison fusion, reduces the displacement error of a radar-positioned sea surface target, and achieves an accurate position detection result.

The invention discloses a one-freedom-degree flexible micro-positioning platform. The one-freedom-degree flexible micro-positioning platform comprises a motion input device, a flexible motion platform and a platform base used for fixing the flexible motion platform; and the flexible motion platform comprises two half motion mechanisms, and each half motion mechanism comprises a motion platform connected through flexible hinges and multi-stage differential motion levers. According to the design, displacement is amplified and can be accurately amplified on the conditions that the positions and the sizes of the flexible hinges and the levers are accurate; the design structure is simple, the occupied space is relatively small, displacement can be output stably through the symmetric structure, lateral additional displacement can be effectively removed, longitudinal coupling displacement errors of the platform can be reduced, the displacement amplification accuracy is improved, and the flexible hinges can be integrally machined easily due to the design, and assembly errors can be avoided. Displacement amplification is accurately realized in relatively-small space and at low cost, and the problem that large stroke and high accuracy of the flexible micro-positioning platform cannot be balanced is solved.

The invention relates to a tiled grating displacement error monitoring system, which comprises a grating tiling device for mounting a tiled grating, wherein a fine adjuster platform of the grating tiling device is provided with a piezoceramics driver; two polar plates of a first digital capacitance micro-displacement sensor are oppositely arranged on positions in the horizontal direction of a coarse adjuster platform and a lower platform of the fine adjuster respectively; two polar plates of a second digital capacitance micro-displacement sensor are oppositely arranged on positions perpendicular to the lower platform and an upper platform of the fine adjuster respectively; output ends of the first and second digital capacitance micro-displacement sensors are connected with the input end of a signal sample circuit; the output end of the signal sample circuit is connected with the input end of a controller of a singlechip; the output end of the singlechip is connected with a PC through a serial port communication circuit; and the output end of the PC is connected with the control end of the piezoceramics driver through a D/A converter.

The invention relates to a non-invasive tumor locating system and a non-invasive tumor locating method. The time concept is introduced on the basis of a three-dimensional radiotherapy technology; the motion during the treatment process and the displacement error of fractionated treatment of anatomy tissue are fully considered, such as the situations at the aspects of changes of radiotherapy dose distribution and influences to the treatment plan caused by breathing peristalsis motion, daily positioning error, target region contraction and the like; and the tumor and the normal organs are monitored in real time by utilizing various kinds of advanced image devices before and during the treatment of patients, and the treatment conditions can be regulated according to the changes of the organ position, thus the radiation field follows the target region closely, and the accurate treatment is really achieved.

The invention discloses a calculating method for a ball center coordinate of a non-contact R-test measuring instrument using an eddy current displacement sensor. The calculating method includes the steps that a measuring coordinate system of the non-contact R-test measuring instrument is calibrated according to design and measuring characteristics of the non-contact R-test measuring instrument; and a coordinate result of a ball center point in the measuring coordinate system is solved and exacted using a differential evolution algorithm according to an eddy current displacement sensor inducedvoltage characteristic curve equation and a sensor induced plane equation. According to the calculating method for the ball center coordinate of the non-contact R-test measuring instrument using the eddy current displacement sensor, accurate measuring of three-direction displacement errors of five-axis numerically controlled machine tool knife tool cutter location points is realized, and the measuring accuracy, range and stability are better.

The invention discloses a correction device and correction method for the geometric position of a cone beam CT system. The correction device comprises a supporting body, a vertical rod, a horizontal ring and locating balls. The vertical rod, the horizontal ring and the locating balls are all fixed to the supporting body. All points on the horizontal ring are arranged in the same face. The vertical rod is perpendicular to the plane where the horizontal ring is located. The two locating balls are arranged on the two sides of the horizontal ring respectively in the direction parallel to the vertical rod, and the distances between the locating balls and the horizontal ring are equal. The geometric correction device including the vertical rod, the horizontal ring and the locating balls is adopted, the projection characteristics of corresponding points, lines and faces are observed, the size and direction of the displacement errors and the angle errors of a detector are judged, corresponding adjustment is carried out, and therefore the geometric correction of the cone beam CT system is achieved faster and more accurately. After correction is completed, a relatively precise geometric parameter value can be calculated according to imaging of one or more points in the device at different positions.

The embodiment of the invention discloses a parallel-connection translational three-dimensional rapid servo device of a numerical control ultraprecision processing machine tool, and aims to solve the technical problems of a traditional FTS device that machining cost is high; machining efficiency is low; multi-degree of freedom displacement error compensation cannot be realized; and absolute rigidity in other directions cannot be ensured. The parallel-connection translational three-dimensional rapid servo device comprises an X-direction driving platform, a Y-direction driving platform, a Z-direction driving platform, main flexible hinges, a subsidiary flexible hinge and a tool, wherein the X-direction driving platform and the Y-direction driving platform are connected with the tool through the main flexible hinges; and the Z-direction driving platform is connected with the tool through the subsidiary flexible hinge.

The invention discloses a laser interference principle-based precise main shaft rotation precision detecting and analyzing method. A precise main shaft rotation precision detecting light path comprises a box body which is used for mounting required instruments, a laser transmitter which is mounted in the box body, four optical convex lenses, a half transparent and half reflecting mirror, a reference ball and a CCD camera; part laser beams emit out from a circular hole in a square box and are projected on a target ball; the target ball is mounted on a precise main shaft through an extending rod. A laser interference pattern which is acquired by the CCD camera is analyzed through an analysis principle to acquire the rotating speed and a three-directional displacement error of the precise main shaft. The laser interference principle-based precise main shaft rotation precision detecting and analyzing method is conveniently used for engineering detection; error separation is not required; the rotating speed, and the axial and radial displacement errors of the precise main shaft can be detected simultaneously; moreover, the detection precision reaches nano scale.

The invention discloses a method for predicting a material equivalent stress-strain relation based on a sphere and cone integrated pressure head. The method includes the following steps that 1, a tested material is subjected to a quasi-static press-in text through the sphere and cone integrated pressure head, so that a continuous load-depth curve is obtained, wherein the lower portion of the pressure head is a spherical pressure head body, and the upper portion of the pressure head is of a conical structure; 2, a spherical loading curvature Cs (delta) and a spherical loading index m (delta) ofthe load-depth curve at a spherical pressure stage are obtained in consideration of displacement errors; 3, a loading curvature Cc of the load-depth curve at a conical pressure stage is obtained; 4,according to Cs (delta) and m (delta) obtained in the step 2 and Cc obtained in the step 3, constitutive parameters of the material are obtained, and the equivalent stress-strain relation is obtained.The method is simple, has universality, and can be used for performing mechanical effect analysis of equivalent stress-strain and related factors of the material under the loading conditions of creeping, impacting and others.

The invention relates to a method for controlling safety and the smoothness degree of a vehicle. According o the characteristics of a vehicle dynamics model and parameters of the vehicle and uncertainty of road conditions during running of the vehicle, control is implemented according to a separation implementation method controlled by the generalized PID. The method includes the steps of dividing control input into one input portion based on the integral of displacement errors and the other input portion based on the displacement errors, speed errors and acceleration errors, introducing variables to dynamically regulate the form the input portion based on the integral of the displacement errors, eliminating uncertain components and external interference of a vehicle control system, selecting the form of the input portion based on the displacement errors, the speed errors and the acceleration errors according to the controllable ideal mode of the vehicle, determining the coefficients of the displacement errors, the speed errors and the acceleration errors, achieving stable control over an ideal mode composition system at the original point, selecting design parameters, and controlling safety and the smoothness degree of the controlled vehicle. The method can be widely applied to vehicle cruise control and control over unmanned driving and the like.