119results about How to "High angular accuracy" patented technology

The invention relates to an instrument for use in computer guided surgery. The instrument includes a shaft and a reference element adapter, wherein the reference element adapter is directly couplable to the shaft and rotatable about the shaft. A selectively operable mechanical retainer provides retention of the reference element adapter to an instrument shaft adapting interface of the instrument shaft. The instrument also includes a reference element orientating mechanism arranged at an interface between the instrument shaft adapting interface and the reference element adaptor. The reference element orienting mechanism is capable of fixing at least one angular position of the reference element. The instrument also includes a grip piece interface on the instrument shaft, and a grip piece is selectively couplable to the grip piece interface.

An ultra-high resolution radar system and technique for transmit or receive AESAs or that yields performance substantially greater than, that of conventional radar systems and techniques while being simple and inexpensive to manufacture. The device comprises the transmit/receive flat or conformal AESA or AESAs steering beam or beams non-depressively, and creating RF FM modulated pulse signals of identical shape and duration through a resistive multiport voltage divider/dividers electrically connected VCOs, RF mixers and STALO or any other narrow-band or wide-band source of RF signals, and to a plurality of radiating elements in order to generate signals providing simultaneously the required beam or beams azimuth and elevation steering electronically and receiving target-echo return pulse signals.

An angle detecting apparatus includes a rotor fixed to a rotating shaft, a pair of magnetic sensors arranged opposite each other so as to output a first detection signal and a second detection signal, respectively, each of which contains information on the angle of rotation of the rotor, a differential operational circuit performing differential operation on the first detection signal and the second detection signal, and an angle calculating circuit calculating the angle of rotation of the rotating shaft based on the result of the differential operation by the differential operational circuit. Here, the distance between two points where a straight line passing through the center of rotation of the rotor crosses the outer periphery of the rotor is constant.

A sheet (20) for use in microfluidic, microelectronic, micromechanical, and/or microoptical applications requiring through-flow, through-conductivity, through-transmission, and/or other through patterns. The sheet (20) includes micro-sized architecture including at least one via (22) extending through the thickness of the layer of thermoplastic material. The via-defining walls in the thermoplastic layer are formed by the thermoplastic material flowing around a projection and then solidifying around the projection.

The invention discloses a fast reflection mirror, comprising a base, a working mirror body, cross spring bearings and a driver; the working mirror body is assembled on a reflection mirror seat; two cross spring bearings constitute one group, there are totally two groups, wherein the axes of the two cross spring bearings in the first group of cross spring bearings coincide with a first straight line, and the axes of the two cross spring bearings in the second group of cross spring bearings coincide with a second straight line; the first straight line and the second straight line are perpendicular to each other and intersected at an origin; each cross spring bearing is connected to the reflection mirror seat and the base respectively; and the driver is used for driving the reflection mirrorseat to rotate within a preset angle range around the first straight line and/or the second straight line. According to the fast reflection mirror, the cross spring bearings support the reflection mirror seat, the cross spring bearings have the advantages of large deflection range and high rotating precision, and when the cross spring bearings are used with the driver, the deflection angle and therotating precision of the working mirror body can be improved, so that the fast reflection mirror is applicable in the fields of precision machinery, precision measuring instruments, medical equipment and the like.

A slab type solid-state laser medium furnished on side faces thereof with three reflecting surfaces, provided therein with a light path for optical amplification attained by multiple reflection on the reflecting surfaces, wherein the three reflecting surfaces comprises Surface C serving as a surface on which an incident laser beam reflects first in the solid-state laser medium, Surface B serving as a surface on which the beam reflected on Surface C is subsequently reflected and Surface A serving as a remaining surface, and wherein when Surface Ac and Surface Bc respectively denote imaginary surfaces forming reflected images of Surface A and Surface B relative to Surface C and when Angle C denotes an angle of intersection between Surface A and Surface B or extended surfaces thereof, Angle A denotes an angle of intersection between Surface B and Surface C or extended surfaces thereof and Angle B denotes an angle of intersection between Surface C and Surface A or extended surfaces thereof, Angle C is larger than each of Angle A and Angle B and the incident laser beam is injected into the solid-state laser medium so that the light path formed for the optical amplification in the solid-state laser medium is equivalent to a light path in which the injected beam repeating reflection between Surface A and Surface Bc has been folded back at Surface C, whereby the light path is capable of producing unit reflections on Surface C, Surface B, Surface C and Surface A sequentially in the order mentioned and inducing a multiplicity of the unit reflections. Otherwise, for the purpose of inducing a nonlinear optical effect, a slab type nonlinear optical device similar in shape to the solid-state laser medium is used in the place of the solid-state laser medium.

The invention discloses an Abe-Koenig roof prism production technology, and belongs to the technical field of optical part production. According to the Abe-Koenig roof prism production technology, through large-surface processing, second-surface processing, third and fourth-surface processing and other processing, frosting and polishing processing is performed on a large surface of an Abe-Koenig roof prism by use of a square brick body, then other three surfaces are processed after the prism is optically cemented by use of an Abe-Koenig roof prism body and an Abe-Koenig roof prism tool, the three surfaces are continuously overturned for processing, and thus the technology can be completed. According to the invention, the purposes of shortening the processing period, improving the work efficiency, improving angle precision and reducing dimension errors are realized, the problem of consistency of precision and dimension during batch production of Abe-Koenig roofs is also solved, the angular precision of a product is improved, the roofs are not broken, and the qualified rate of the product is improved.

The invention discloses a device for measuring a magnetic field of a cyclotron. The device comprises a rotary driving part, a rotary part and a rotary positioning part, wherein a driving shaft is connected with a swing arm through a key; the rotary positioning part is positioned in the lower part of the rotary part; and the swing arm and a positioning shaft are in a rigid connection. The rotary driving part is separated from the rotary positioning part, so that a positioning component is not influenced by a driving connection gap, thereby reducing the circumference error of the rotary positioning system and improving the measurement accuracy of the magnetic field.

[Problem] In a surveying instrument that automatically tracks or collimates a target, the target that is moved to a measurement point and is placed there can be found in the shortest possible time.

[Solution Means] In a survey system made up of a target (60) and a surveying instrument (50) that automatically tracks or collimates the target, the target is provided with a direction angle sensor (86) that measures a surveying-instrument direction angle (θta, θtb) obtained when the target is directed toward the surveying instrument, whereas the surveying instrument is provided with a horizontal angle measuring portion that measures a target direction angle (θsa, θsb, θsc) indicating the direction of the target. An estimated target direction angle (θsb) is calculated from an angular difference (θ_o0) between the surveying-instrument direction angle (θta) and the target direction angle (θsa) obtained at the last measurement and from the surveying-instrument direction angle (θtb) obtained at the present measurement. The instrument body (52) is directed in the direction of the estimated target direction angle.

A rack bar (10) includes a first bar member (11) having a first toothed portion (20), a second bar member (12) having a second toothed portion (21), and a joint member coaxially coupling the first and second bar members. The joint member (13) has a first joining portion (23) and a second joining portion (25) that are provided coaxially with each other. Each of the first and second joining portions has a hollow cylindrical shape. An inner peripheral surface of the first joining portion and an outer peripheral surface of an end portion (22) of the first bar member are joined to each other with an adhesive. An inner peripheral surface of the second joining portion and an outer peripheral surface of an end portion (24) of the second bar member are joined to each other with an adhesive.

The invention discloses a system for detecting phase centers of GPS (global positioning system) antennas by the aid of continuous rotation processes. The system comprises a base, a rotary table and a control unit. The rotary table comprises a support rod, a cantilever support plate, a rotary support bearing, a driven gear and a GPS antenna connecting rod; a stepper motor is fixed to a cantilever end of the cantilever support plate, a driving gear which meshes with the driven gear is arranged on an output shaft of the stepper motor, the stepper motor is connected with an encoder, and the encoder is used for feeding back rotation angles of the stepper motor; the control unit comprises a man-machine interaction module, a GPS time service module and a motor driver which are connected with a single chip microcomputer controller. The single chip microcomputer controller is connected with the encoder and is used for receiving rotation angle information of the motor, and the rotation angle information of the motor is fed by the encoder, so that closed-loop control can be carried out on the GPS antenna connecting rod. The system has the advantages that pointing directions of the antennas can be accurately changed by the system, and accordingly influence of observation errors such as multi-path effects can be effectively reduced; detection results are accurate, data are real, and the system is high in practicality.

The invention relates to the technical field of machining, and discloses a crank shaft grinding method. The crank shaft grinding method comprises the following steps that: a crank shaft rotates around the rotation centre of the crank shaft; and the rotation centre of a grinding wheel moves according to a predetermined movement track curve, so that the high point of the grinding wheel grinds the high point of a connecting rod journal all the time. Only by making the rotation centre of the grinding wheel move according to the predetermined movement track curve, the crank shaft grinding method can ensure that the high point of the grinding wheel tracks and grinds the high point of the connecting rod journal all the time so as to grind the connecting rod journal and ensure high grinding accuracy of the connecting rod journal. The invention also discloses a crank shaft grinding machine.

The invention relates to an H-shaped ultraprecise worktable structure, belonging to the fields of precise measurement, ultraprecise machining, minitype machines, nanometer, and the like. An X-axis slide block is encircled on an X-axis guide rail, the two ends of the X-axis guide rail are fixed on two Y-axis slide blocks which are encircled on a Y-axis guide rail, and the Y-axis guide rail is fixed on a base through a guide rail pad. The H-shaped ultraprecise worktable structure is characterized in that the X-axis slide block and the Y-axis slide blocks are designed as symmetrical and closed structures, and fixed compressed gas film clearances are retained among the slide blocks and the upper surface of the base, a clearance between the upper surface of the X-axis guide rail and the upper surface in the X-axis slide block is no less than the deformation of the X-axis guide rail caused by the weight of the X-axis guide rail, a clearance between the lower surface of the X-axis guide rail and the lower surface in the X-axis slide block is no less than the deformation of the X-axis guide rail caused by the weight of the X-axis guide rail, and the design of the Y-axis guide rail is the same as that of the X-axis guide rail. By adopting the structure, the guiding precise of the guide rails and the stability of the worktable structure are improved, and the positioning precision of the X-axis and the Y-axis are not influenced by each other, thereby the effect of error superposition is avoided. In addition, the system has high rigidity and good precision retaining ability.

A method for determining a location of remotely emplaced objects. The method including: (a) scanning a field for one or more remotely emplaced objects with a reference source signal from a reference source; (b) detecting the signal at one or more orientation sensors associated with each of the one or more remotely emplaced objects; (c) determining an angular direction of each of the one or more remotely emplaced objects relative to the reference source based on the signal received at the one or more orientation sensors associated with each of the one or more remotely emplaced objects; (d) directing a range signal from the reference source towards each of the remotely emplaced objects at a corresponding determined angular direction; (e) in response to the range signal, transmitting a response signal from each of the remotely emplaced objects to the reference source; and (f) determining a range for each of the one or more remotely emplaced objects relative to the reference source at the determined angular direction based at least partially on the range and response signals.

The invention discloses a modularized underwater robot vector propulsion mechanism. The mechanism is structurally composed of a propeller propulsion motor, a circumferential rotation module and a swing module which are arranged on the same axis. Vectorization of the propulsion mechanism is achieved. Compared with a vector propulsion mechanism of a traditional spherical parallel mechanism, the modularized underwater robot vector propulsion mechanism has the advantages of being modularized, low in fault rate and high in control accuracy.

The invention relates to a method for preparing high-accuracy prism, comprising preparing large-scale base plate (1) and small-scale base plate, said large-scale base plate is platform, and the width and thickness of small-scale one is the same to that of large-scale, but the depth is smaller; forming dielectric multiple layer membrane (3) on one side of each base plate, laminating alternatively large-scale and small-scale base plate to form step in width direction according to thickness amount, shoeing out the two end of large-scale base plate in depth direction as base plate surface B; laminated vitreum (4) is cut along direction parallel to step, grinding cut surface of cut multigang vitreum (5); then, cutting multigang vitreum in vertical direction and getting rectangular vitreum (6); cutting it; grinding it taking showed base face B as guideline to form 45 degree grinding surface.

The invention is a gamma ray detector that locates a source, both horizontally and vertically. The detector comprises a tubular shield surrounded by scintillator panels. Gammas incident from one side can fully strike the scintillator facing the source, but are blocked from reaching the scintillators on the opposite side of the shield. The scintillator counting rates thus indicate the lateral direction of the source. By iteratively rotating toward the highest-counting scintillator, the detector converges to the source. An additional, central detector can be mounted within the tubular shield. When analyzed with the outer scintillators, the central detector determines the overall angular separation between the source and the detector axis, thereby locating the source in two dimensions automatically. The invention enables rapid detection and precise localization of clandestine nuclear and radiological weapons, despite shielding and clutter obfuscation, while quickly passing clean loads.

An angular velocity measuring device (1) includes a first sensor (2) (vibratory gyroscope) and a second sensor (3) (gas rate gyroscope). A detected output of the first sensor (2) is input to a highpass filter (4) and an output of this filter (4) is stored in the time series into a memory (10). Subtraction means (11) sequentially performs operations of subtracting an output ωv′(t−tsd) of the filter (4) at a time a predetermined time period tsd earlier from an output ωv′(t) of the filter (4), and addition means (12) sequentially adds the value obtained by the above to an output ωg(t) of the second sensor (3), whereby an angular velocity measurement is obtained. Thereby, it is possible to provide an angular velocity measuring device whose angular velocity measurements are high in response and stability at a low price.

The invention provides an angle positioning device for a distance-variable pull rod and the angle positioning device comprises an angle adjusting rod (3), a locking mechanism and a clamp (1), whereinthe angle adjusting rod comprises a first rod (31) and a second rod (32) that are coaxial; and the end parts of the first rod (31) and the second rod (32) are rotationally connected; the locking mechanism is arranged at the joint of the first rod (31) and the second rod (32) and is used for fixing the first rod (31) and the second rod (32) after the first rod (31) and the second rod (32) rotate toa certain angle; The clamp (1) is arranged at the other ends of the first rod (31) and the second rod (32), and ear pieces at the two ends of the distance-variable pull rod are clamped by clamping part (11). According to the invention, joint bearings with handles at two ends of the distance-variable pull rod are clamped by the clamps at two ends, the relative angles of the joint bearings with handles at two ends of the distance-variable pull rod are directly ensured, so the angle positioning device has advantages of high angle precision, easy operation, suitability for different helicopters and like.