115results about How to "High position resolution" patented technology

A nuclear medical diagnostic equipment wherein radiation which is emitted by a nuclide administered into the body of a patient is detected as projection data by a gamma camera, and an image which indicates the distribution of the nuclide within the body of the patient is obtained on the basis of the projection data. The equipment comprises a rotation unit which rotates the radiation detector round the patient, a respiration identification unit which identifies breathing of the patient and non-breathing thereof based on breath holding, a data storage unit in which the radiation detection data acquired by the radiation detector are stored in an identifiable manner on the basis of a result of the identification by the respiration identification unit, and an image generation unit which generates the image from the radiation detection data stored in the data storage unit on the basis of the result of the identification by the respiration identification unit.

The invention relates to a scintillation crystal array detecting device, which comprises a crystal array, M*N light guides, an optical fiber splitter unit, an optical fiber merging unit and an opticalfiber signal reading unit, wherein the crystal array comprises M*N crystals for generating fluorescence photons, M represents the number of rows, and N represents the number of columns; each light guide is connected with the surface of a crystal to collect and transmit the fluorescence photons generated by the crystal; the optical fiber splitter unit is used for splitting fluorescence photons transmitted by each light guide into two paths of optical fibers which are a row transmission optical fiber and a column transmission optical fiber to transmit the fluorescence photons; the optical fibermerging unit is used for fusing row transmission optical fibers corresponding to light guides connected with the same row of crystals into a row optical fiber and fusing column transmission optical fibers corresponding to light guides connected with the same column of crystals into a column optical fiber; and the optical fiber signal reading unit is connected with the row optical fibers and the column optical fibers to recognize the numbers of the rows in which the row optical fibers transmitting the fluorescence photons are and the numbers of the columns in which the column optical fibers transmitting the fluorescence photons are to further determine the position of scintillation crystals and detect the total quantity and energy of received fluorescence photons. The device is reduced incost, volume and weight and has high position resolution and fluorescence collection efficiency.

Disclosed herein are a method of producing microstructure and a method of producing mold, the methods permitting production of much smaller pores than before in an atmosphere where impurities are negligible and also permitting production of microstructures having a smaller size and a higher crystallinity than before with the help of the pores. The method of producing microstructure comprises a step of making pores (4) in a substrate (1) to become a mold (5) by irradiation with a focused energy beam (3) and a step of growing a microstructure (8) in the thus made pores (4). The method of producing a mold includes a step of making pores (4) by irradiating a substrate (1) to become a mold (5) with a focused energy beam (3).

The invention belongs to the technical field of precision measurement and the field of optical engineering and specifically relates to a combination zeroing laser large working distance auto-collimation device and method. The device consists of a light source, a collimating mirror, a reflecting mirror and a feedback imaging system; according to the method, via adjustment of the reflecting mirror, a reflected light beam is enabled to return to a center of an image plane of the feedback imaging system; an angular deflection measurement device on the reflecting mirror is used for obtaining angular variation of a surface of an object being tested. Because the reflecting mirror is added in a traditional auto-collimation angle measurement system, a problem that measurement cannot be realized when light reflected by the object being tested is deviated from a measurement system can be prevented; an auto-collimation working scope can be expanded while working distance remains the same or working distance is increased while the auto-collimation working scope remains the same; via specific design of the collimating mirror, the feedback imaging system, the reflecting mirror and the like, the combination zeroing laser large working distance auto-collimation device is enabled to be simple in structure and low in manufacture cost; measurement operation can be conducted even in unstable measurement environments, and a technical advantage of rapid measurement can be gained.

Some embodiments may include a capacitive rotary position encoder for the absolute determination of a rotary position about a rotary spindle. The rotary position encoder may include a transceiver unit, comprising a first arrangement of N electrically conductive, capacitive sensitivity areas which are embodied as angle segments over a defined angle range, which are distributed uniformly over the circumference, an electrically conductive reference area and an evaluation circuit, by means of which an electrical capacitance value between the reference area and one of the sensitivity areas is determinable. In some embodiments the sensitivity areas and the reference area are embodied as conductor track structures on a first electronics printed circuit board. A counterpart may be situated opposite the transceiver unit and rotatable relative thereto about the rotary spindle and may include a reference coupling area arranged opposite the reference area, and an arrangement of electrically conductive code areas connected thereto.

The invention provides an optical identification and range-finding device. The device comprises a laser transmitting unit used to transmit two bundles of combination rays formed by laser with different wavelengths to an object to be measured, a laser receiving unit used to receive optical signals reflected by the object to be measured and performing photoelectric conversion to the received optical signals and outputting electric signals, a demodulation unit used to demodulate the electric signals output by the laser receiving unit into electric signals produced by the two bundles of the laser with the different wavelengths, an analog/digital (A/D) conversion unit used to perform analog/digital (A/D) conversion to the electric signals output by the demodulation unit and output digital signals, a direction adjustment unit used to adjust the propagation direction of the combination rays emitted by the laser transmitting unit and a control unit used for the control of the whole device. The device has high detection accuracy, quick speed, and good real-time performance.

The invention provides a microchannel plate type fast neutron position gas detector and a detection method thereof, and relates to the field of nuclear technology applications. The detector comprises a gas chamber with an intake hole and an exhaust hole, a drift cathode, a microchannel structure plate, a gas electron multiplier, a high voltage dividing circuit, a read out PCB and a working gas. The drift cathode is arranged in the gas chamber with the intake hole and the exhaust hole. The microchannel structure plate is arranged below the drift cathode. The gas electron multiplier is arranged below the microchannel structure plate. The read out PCB is arranged below the gas electron multiplier. The working gas fills the whole chamber and a microchannel in the microchannel structure plate. The microchannel plate type fast neutron position gas detector provided by the invention can normally work at a high counting rate, and can be used for large part non-destructive detection and container scanning security check.

A medium area (S) filled with liquid xenon (2) is formed between an external cylindrical body (1a) and internal cylindrical body (1b), and a pair of anode pads (11, 12) are disposed in two-dimensional form in opposite end portions of the medium area (S) in the intersection direction with respect to the gamma-ray incident direction. An intermediate electrode (10) is disposed between a pair of anode pads (11, 12), and a plurality of photomultiplier tubes (5) is installed in two-dimensional form in the external cylindrical body (1a). Then, the gamma-ray reaction point within the liquid area (S) is identified from signals output from the anode pads (11, 12) and photomultiplier tubes (5).

The invention discloses a high-thrust piezoelectric linear motor driven by three-phase longitudinal vibration modality, which comprises a stator component, a rotor component, and a pedestal component. The high-thrust piezoelectric linear motor driven by three-phase longitudinal vibration modality is characterized in that: the stator component is connected with the pedestal component through a bolt; the rotor component is connected with the pedestal component through a rolling rail pair; and the stator component is connected with the rotor component through a friction pair. The high-thrust piezoelectric linear motor driven by three-phase longitudinal vibration modality has the technical effects that: (1) d33 effect of a piezoelectric lamination is used to excite the longitudinal vibration of cross rods and longitudinal rods to push, which can drive a motor to output a larger power; (2) two longitudinal rods in the stator component alternatively drive the rotor component in the same vibration period, which can drive the motor to output a larger speed and increase the thrust of the motor; high stator vibration frequency, small drive step pitch and high position distinguishability can drive the motor to realize submicron-grade and even higher-grade locating precision; the stator component is of a plane H structure, which is beneficial for realizing the thinning and lightening of the motor; the rotor component is designed into a structure with proper flexibility, which can guarantee an ideal contact state between the stator component and the rotor component, and is beneficial for improving the stability of the motor and reducing the heating of the motor; moreover, a rolling rail is adopted between the rotor component and the pedestal component, which can greatly reduce the running resistance of the motor, and is beneficial for improving the efficiency and response speed of the motor.

The invention relates to a threaded hollow revolution type travelling wave ultrasound motor used for adjusting a diaphragm. The diaphragm comprises a diaphragm fixing ring and a diaphragm moving ring provided with a connecting rod, and the threaded hollow revolution type travelling wave ultrasound motor provided by the invention comprises a base, a piezoelectric ceramic piece, a friction material layer, a damping material layer as well as a stator shaft and a rotor shaft which are arranged in a hollow manner along an axis. The threaded hollow revolution type travelling wave ultrasound motor provided by the invention has the advantages that the infliction preliminary pressure is large, the regulation precision is high, the installation is convenient, the structure is simple, the torque output is large, and meanwhile, the threaded hollow revolution type travelling wave ultrasound motor is used for a diaphragm adjusting system. The threaded hollow revolution type travelling wave ultrasound motor provided by the invention is also suitable for a precision optical system which needs high diaphragm adjusting precision.

The invention belongs to the technical field of precision measurement and the field of optical engineering and specifically relates to a high precision, wide range and large working distance laser auto-collimation device and method. The device consists of a light source, a collimating mirror, a reflecting mirror and a feedback imaging system; according to the method, via adjustment of the reflecting mirror, a reflected light beam is enabled to return to a center of an image plane of the feedback imaging system; an angular deflection measurement device on the reflecting mirror is used for obtaining angular variation of a surface of an object being tested. Because the reflecting mirror is added in a traditional auto-collimation angle measurement system, a problem that measurement cannot be realized when light reflected by the object being tested is deviated from a measurement system can be prevented; an auto-collimation working scope can be markedly expanded while working distance remains the same or working distance is markedly increased while the auto-collimation working scope remains the same; via specific design of the collimating mirror, the feedback imaging system, the reflecting mirror and the like, the high precision, wide range and large working distance laser auto-collimation device is enabled to be characterized by simple structure and low manufacture cost; rapid measurement can be realized.

The invention relates to the field of precision measurement technology and the field of optical engineering and in particular relates to a portable combined zero setting high precision laser large working distance auto-collimation device and method. The device comprises a light source, a collimating mirror, a reflector, and a feedback imaging system. The method makes reflected light beams return to the image plane center of the feedback imaging system by adjusting the reflector and obtains the angle change of the surface of a measured object by means of an angle deflection measuring device on the reflector. The reflector is added to a conventional auto-collimation angle measuring system, so that the problem that measurement is impossible because reflected light of a measured object deviates from the measuring system is solved and the auto-collimation working range is increased on the condition of the same working distance or the working distance is increased on the condition of the same working range. Owing to the specific design of the collimating mirror, the feedback imaging system and the reflector, the device is small, portable, and high in measurement precision, can monitor the stability of measurement environments, and can perform measurement rapidly.

The invention belongs to the precision measurement technology field and the optical engineering field and especially relates to a high-precision, wide-range and large-work-distance auto-collimation device and a method thereof. The device is formed by a light source, a collimating mirror, a reflecting mirror and a feedback imaging system. In the method, through adjusting the reflecting mirror, a reflected light beam is returned to a feedback imaging system image plane center; and through using an angle deflection measurement apparatus on the reflecting mirror, an angle change of a measured object surface is acquired. Because the reflecting mirror is added on a traditional auto-collimation angle measurement system, a problem that measured object reflection light deviates the measurement system so that measurement can not be performed can be avoided. Under a same work distance, an auto-collimation work range is increased, or under the same work range, the work distance is increased. Besides, because of specific designs of the collimating mirror, the feedback imaging system, the reflecting mirror and the like, the structure is simple and manufacturing cost is low; under a low sampling frequency, measured precision is high and rapid measurement can be reached.

The invention belongs to the field of precision measurement technology and optical engineering, and specifically relates to an array zero-setting laser large working distance auto-collimation device and method. The device is composed of a light source, a collimating mirror, a reflector and a feedback imaging system. In the method, by adjusting the reflector, a reflected beam is returned to the center of an image plane of the feedback imaging system, and then an angular deflection measuring device on the reflector is used to obtain angle changes of the surface of a measured object. In the invention, since the reflector is added to the conventional auto-collimating angle measuring system, it is possible to avoid the problem that measuring can not be carried out since reflected light of the measured object deviates from the measuring system, so that the advantage of increasing the auto-collimation range at the same working distance or increasing the working distance in same auto-collimation range are realized. In addition, the specific design of the collimating mirror, the feedback imaging system, the reflector and the like make the device of the invention simple in structure, low in production cost, and capable of performing measurement in an unstable measurement environment; and a technical advantage of rapid measurement is realized.

A method for suppressing electromagnetic background radiation in the image according to a precharacterization, a device for carrying out the method according to a precharacterization, a measuring instrument, and a use of the device for identifying a laser signal as a mark for subsequent measuring processes as well as for identifying a source of a laser signal.

The invention relates to a three-legged platform driven by a piezoelectric ceramic actuator. The three-legged platform comprises: an upper plate; a lower plate positioned below the upper plate; and three piezoelectric actuators, wherein the two ends of each piezoelectric actuator are respectively connected with the upper plate and the lower plate, and the piezoelectric actuators control the inclined angle of the upper plate relative to the lower plate through stretching. The control method of the three-legged platform driven by a piezoelectric ceramic actuator comprises the following steps of:establishing an equilateral triangle on a rectangular coordinate system, setting the three vertexes of the equilateral triangle to be A, B and C, determining the value of the height h required by a gravity center to lift and an orientation angle [alpha] of the gravity center, determining the size of the [alpha], and calculating the elongation Ha of an A-point actuator, the elongation Hb of a B-point actuator and the elongation Hc of a C-point actuator. The three-legged platform driven by the piezoelectric ceramic actuator is high in use precision, low in cost, small in size and easy and convenient to control, and the control method is high in universality and low in use technical threshold.

A piezoelectric motor has a stator module 1, comprising two pairs of piezoelectric actuators Ia, Ib and 2a, 2b inside this stator module. The stator module is fixed by a central fixing point (A). The piezoelectric actuators 1a, 1b, 2a, 2b are connected to the stator module via flexible or biasing elements 3, such as for instance hinges, for instance elastic hinges. The stator module 1 comprises a tuning mechanism 4, comprising at least one mass 4a, 4b and at least one flexible or biasing element 5a, 5b, 5c, 5d, for instance leaf springs. The stator module 1 is contacted to a driven part 6, for instance a slider, at the contact point (A). The piezoelectric motor is designed such that contact point (B) is able to produce a closed trajectory, thereby inducing a relative motion of the driven part 6. The contact point (B) is moved by applying an electric field to actuators Ia and Ib and/or by applying an electric field to actuators 2a and 2b.