18 results about "Conical beam" patented technology

The invention discloses an information encryption and reconstruction method based on a spiral cone light beam orbital angular momentum multi-dimensional holographic technology, and relates to the technical field of optical information processing and information encryption. The method comprises the following steps: discretizing a target image, generating an initial hologram through phase recovery, embedding a spiral cone phase represented by a topological charge l and a radial factor r0 in the hologram, and multiplexing different channels in an orbital angular momentum dimension and / or a spatial azimuth angle dimension, and finally, decryption and reconstruction are completed on the Fourier plane by using a spiral cone light beam conjugated with the encrypted phase. Due to the fact that spiral cone light beams corresponding to different channels are different in l, r0 and azimuth angles, more multiplexing channels with higher distinction degree can be constructed in the same optical aperture, and the problems that in the prior art, the information multiplexing dimension and capacity are limited, coupling interference exists between the channels, the system is complex, and confidentiality is insufficient are solved on the whole.

The embodiment of the invention provides a beam decomposition method for electromagnetic acceleration calculation of an electrically large-sized target, and the method comprises the steps: 1, obtaining a sampling data file, and converting the related parameter information when a read antenna pattern is represented by a uniform sampling grid into a data organization form capable of carrying out query processing; 2, performing uniform sampling on a spherical surface through a gold spiral method, and determining a sub-beam center; 3, limiting a Gaussian beam edge amplitude attenuation threshold value, calculating a beam variance as a limiting condition, and controlling the shape width of the Gaussian beam to be used; and 4, completing high-fidelity beam decomposition of the directional diagram by adopting local convolution, amplitude alignment and phase cloning operation, and ensuring that each sub-beam strictly inherits original field characteristics. According to the method, distributed parallel computing of a complex scattering problem is realized through a conical beam decomposition and region mapping mechanism, and the computing efficiency is remarkably improved while the computing precision is ensured.

The invention discloses a pulse neutron generation device for cutting steady-state neutron radiation and a pulse time measurement method. Comprising a steady-state neutron radiation source device, a shielding structure, a supporting frame, a collimator provided with a conical beam limiting diaphragm, a cutting sliding block made of neutron absorbing materials and internally provided with a penetrating beam limiting hole, a sliding block falling stabilizing device, a sliding block height adjusting device, a sliding block releasing device and a detector located on the emergent side. The cutting sliding block freely falls down along a vertical track limited by the falling stabilizing device after being released at a preset height, time cutting is carried out on a steady-state neutron beam passing through the collimator, a reference point is arranged on the supporting frame according to the pulse time measuring method, and a photoelectric probe A, a photoelectric probe B and a timer are arranged near a falling path; in the falling process of the cutting sliding block, the two photoelectric probes are sequentially shielded to trigger the timer to start / stop timing, and the time interval recorded by the timer is determined as the actual pulse width of pulsed neutron radiation.

This invention provides a Ka / V band dual-frequency conical beam antenna for millimeter-wave detection, comprising an upper square metal structure, a lower square metal structure, a coaxial waveguide, an open circular waveguide, and a feed network. The open circular waveguide is the main radiating part, transitioning from the coaxial waveguide to the open circular waveguide, allowing the open circular waveguide to operate in TM mode to generate a radially symmetrical electric field distribution. By adjusting the size of the open circular waveguide, TM01 and TM02 modes exist within it, respectively generating Ka / V band electromagnetic waves. This invention utilizes a shielded microstrip line to excite the fundamental TEM mode of the coaxial waveguide before transitioning to the TM mode of the circular waveguide, which can suppress other unwanted modes, thereby making the omnidirectional radiation of the antenna more uniform. The coaxial waveguide is a stepped coaxial waveguide with varying radius. The stepped structure of the waveguide inner diameter can achieve good impedance matching. The structure is simple, easy to implement, and has dual-frequency, dual-tilt radiation characteristics.

The invention relates to a single-layer wide-beam patch antenna unit and a wide-angle scanning phased array thereof, the patch antenna unit comprises a single-layer dielectric substrate, a radiator and the ground, the radiator is formed by symmetrically loading two pairs of L-shaped branches with grounding via holes in the center, a plurality of grounding via holes with top loading U-shaped strips and a pair of no-load U-shaped strips on the periphery of an E surface of a U-shaped groove patch. The L-shaped branch widens the E-plane wave beam by prolonging the current path, reducing the patch size and coupling and exciting the center grounding through hole; ten grounding via holes of the top loading U-shaped strip adopt a parallel equivalent inverted F structure, a complementary conical wave beam is introduced through resonance under the height of a single-layer substrate, and an E-plane wave beam is broadened; the no-load U-shaped strip enhances the vertical current of the ten grounding through holes and guides the surface wave, so that the half-power beam width of the E surface reaches 182 degrees. According to the 1 * n phased array composed of the units, decoupling rectangular ring grooves are etched in a printing place, mutual coupling lower than-16dB and 3dB wave beam scanning with the width of + / -76 degrees are achieved, and the 1 * n phased array has the remarkable advantages of being easy to machine, low in profile, low in mutual coupling and wide in scanning range.

The invention discloses a PGAI-NT analysis device and method based on an accelerator conical thermal neutron beam, and the device comprises an accelerator D-Be double-target graphite moderated body neutron source which employs a semicircular Be target design, a D ion beam generated by the accelerator bombards two semicircular Be targets to form two wide energy spectrum neutron sources, and parallel beam thermal neutrons are formed through a graphite moderated body; the neutron beam focusing equipment is used for converging the parallel beam thermal neutrons into conical beam thermal neutrons; the sample table is used for placing a tested sample, so that the conical beam thermal neutrons irradiate the sample; the line collimator is used for collimating gamma rays generated after the sample is irradiated by the conical beam thermal neutrons; the LaBr3 array detector is used for detecting the aligned gamma signal; and the imaging equipment is used for detecting and imaging the conical beam thermal neutrons penetrating through the sample.

The application discloses a Ka-band conical beam antenna, which is composed of a single-layer metal floor, a coaxial probe, a single-layer dielectric substrate and an antenna patch array. The single-layer metal floor is rectangular, a metal through hole is arranged at the center of the floor, an SMA joint is arranged at the bottom of the floor, the SMA joint is in contact with the floor and is connected with the coaxial probe. The upper layer of the dielectric substrate is the antenna patch array. The whole antenna is composed of eight impedance-matched antenna patch units on the dielectric substrate to form a Chinese character-shaped pattern. Each patch unit is composed of a rectangular microstrip antenna, a parasitic capacitance ring, a transmission microstrip line and an impedance-matching microstrip line. The antenna is connected with a signal from the SMA joint through the coaxial probe penetrating through the single-layer dielectric substrate and the single-layer metal floor. The application can realize the design requirements of a wide beam, high gain and low side lobe.

The present application relates to the technical field of micro computer tomography, and discloses a large-aperture parabolic single glass tube micro-CT system and a reconstruction method thereof, the system comprising an X-ray source, a straight-through X-ray shutter, a first lens supported by a lens support to move, a sample supported by a sample stage and an X-ray flat panel detector arranged in sequence along an optical axis; the first lens is a large-aperture parabolic glass tube lens of millimeter level, and the lens support is used for adjusting the angle, pitch and optical axis coaxiality of the first lens; an electric control platform controller is electrically connected with the lens support and the sample stage respectively, and a main control computer controls the sample stage to perform angle scanning, sub-pixel angle jitter sampling and multi-view field splicing scanning through the electric control platform controller. The present application adopts a large-aperture parabolic glass tube lens of millimeter level, and the quasi-parallel beam geometry after system regulation and control enables the micro-CT system to be compatible with parallel beam algorithm, and the image reconstruction quality of the original cone beam algorithm is retained and improved.

The invention relates to the technical field of CT image reconstruction, and discloses a cone beam CT scanning image rapid reconstruction system and method based on deep learning, and the system comprises a dual-ray generation module, a scanning module, a deep learning reconstruction module, and a result output module. The dual-ray generation module comprises two ray generators, a beam outlet of one ray generator is provided with a 0.1 mm low atomic number material aluminum to filter an X-ray ultra-low energy part, and the other beam outlet is provided with a 0.1 mm high atomic number material copper to attenuate the X-ray low energy part. According to the method, the dual-energy-spectrum projection data is obtained through the dual-ray generator, the tissue linear attenuation coefficient is solved through fitting by taking PMMA and aluminum as base materials, background interference is corrected in combination with air reference data, the error of the reconstructed CT value in the soft tissue area is smaller than or equal to + / -10 HU, the error of the reconstructed CT value in the cortical bone area is smaller than or equal to + / -30 HU, and compared with traditional CBCT, the method is more accurate, and a reliable foundation is laid for preventing power ratio calculation.

A four-frequency-band directional vehicle-mounted antenna comprises a metal floor, a dielectric substrate, a slotted radiation patch unit, a coaxial feeding structure and two T-shaped monopole branches. The slotted radiation patch unit is a circular patch, four L-shaped slots are formed on the circumferential edge of the circular patch, the L-shaped slots can change the current distribution of the high-order mode of the circular patch, reshape the irregular conical beam, and form a directional inclined double beam; meanwhile, the introduction of the L-shaped slots can increase the current path and thus reduce the resonance frequency of high frequency. The two T-shaped monopole branches are oppositely and equally spaced on the two sides of the slotted radiation patch unit, used to excite the equivalent magnetic current on the two end edges of the circular patch, and the equivalent magnetic current is symmetric about the center, thus forming a directional inclined double beam with higher gain value.

The invention relates to the field of ultra-precision optical manufacturing, and provides an electromagnetic and permanent magnet combined gradient magnetic field regulated magnetorheological jet polishing head which comprises a supporting assembly, a servo motor, a sliding ring assembly, a permanent magnet assembly and a polishing assembly. The servo motor is arranged on the supporting assembly through a motor support, and the output end of the servo motor is connected with an input port of the rotating end of the hollow servo platform. The slip ring assembly comprises an electro-hydraulic slip ring, a hydro-electric slip ring supporting plate, a hollow servo platform connecting plate and a hollow servo platform. An electric slip ring of the electro-hydraulic slip ring is connected with the supporting assembly through the hydro-electric slip ring supporting plate, the hollow servo platform connecting plate and the center control servo platform. Through compact integration of the hollow servo platform and the electro-hydraulic slip ring, stable positioning of the tweezers-shaped magnet yoke structure, independent cooling layout of double coils, multi-layer isolation sealing and optimal design of a conical beam, the compactness, stability and liquid recovery efficiency of the device are remarkably improved, and modular disassembly and assembly are achieved through a quick connector.

The invention relates to a satellite signal cone beam drawing method and system, electronic equipment and a storage medium. The method comprises the following steps: dynamically acquiring satellite original data, and encapsulating the satellite original data into dynamic scene marking data; the satellite original data at least comprises a real-time first position coordinate of a satellite and a second position coordinate of a satellite signal coverage target; according to the first position coordinate and the second position coordinate, calculating the length and direction of a conical beam from the satellite to the coverage target, and determining the bottom surface of the conical beam according to the first position coordinate; and drawing the conical wave beam of the satellite signal from the satellite to the coverage target based on the length, direction, position and bottom surface of the conical wave beam. According to the method, the conical wave beam coverage range of the satellite signal can be calculated in real time according to the position of the satellite, the satellite signal coverage range and the signal coverage change in the satellite motion state can be presented more visually, and the visual effect and the performance experience are improved.

The application provides a medical particle accelerator scanning type continuous irradiation beam distribution system, which comprises a mounting frame and a double scanning magnet, a scattering device, an energy continuous modulator and a switchable swingable collimator device arranged in sequence from far to near along a straight line from a point light source to an isocenter, wherein the double scanning magnet is responsible for deflecting and scanning a speed, the scattering device is responsible for changing a cylindrical scanning speed into a conical beam with a certain divergence angle, the switchable swingable collimator device is responsible for restricting the conical beam into a trapezoidal beam, and the energy continuous modulator is responsible for longitudinally pulling a Bragg peak to perform continuous irradiation of each irradiation unit.

Method for dual-energy imaging of an imaging area (5) with an X-ray device (1) comprising an imaging arrangement with an X-ray source (3) and an X-ray detector (4) for receiving X-rays from an X-ray field (9) emitted by the X-ray source (3) in conical beam geometry, which has a central beam (10), wherein the imaging arrangement is rotated around the imaging area (5) to acquire projection data of different projection directions for two different X-ray spectra and a three-dimensional image data set of the imaging area (5) is reconstructed from the respective projection data for each X-ray spectrum. wherein projection data of both X-ray spectra are recorded during the rotation covering at least 360°, wherein for each X-ray spectrum an assigned, in particular at least substantially half of the X-ray field (9), fixed portion (24, 25) of the X-ray field (9) and a corresponding, assigned, fixed portion (28, 29) of the X-ray detector (4) is used, wherein the X-ray source (3) has two foci (43, 44) spatially separated by a focus distance (45), assigned to different X-ray spectra, which follow each other in the plane of rotation (27), characterized by that the foci (43, 44) are operated with different tube voltages and the partial beam fields (50, 51) emitted by the foci (43, 44) are separated by a shading element (52) arranged in the beam path between the foci (43, 44), in particular such that each half of the X-ray detector (4) is assigned to a partial beam field (50, 51) for illumination, that the foci (43, 44) are generated in the same X-ray tube (46) of the X-ray source (3), switching sequentially between the different tube voltages, and that the sequentially illuminated components (28, 29) of the X-ray detector (4) are read out in a common readout cycle.

The invention relates to the technical field of antennas, in particular to a conical beam antenna based on a tight coupling theory. The antenna comprises a radiation plate, a power dividing plate, a feeder plate and a short circuit column, the radiation plate and the power dividing plate are arranged in parallel at intervals, multiple groups of parallel patches and multiple groups of dipole arms are arranged on the front face and the back face of the radiation plate, the multiple groups of dipole arms are radially distributed outwards from the center of the radiation plate, and the parallel patches and the dipole arms arranged on different faces are overlapped. The radiation plate is provided with a first feed line position in the middle of each group of dipole arms, the power dividing plate is provided with a second feed line position, the plurality of feed line plates are vertically connected between the radiation plate and the power dividing plate, two ends of each feed line plate are respectively connected with the first feed line position and the second feed line position, and the short circuit column is connected with the radiation plate and the power dividing plate. The center of the power dividing plate is provided with a coaxial feed port, and the radiation plate, the power dividing plate, the feed line plate and the short circuit column are arranged in an integral symmetrical structure. According to the antenna, the bandwidth is expanded to more than three times of frequency, and better out-of-roundness can still be obtained on the premise of not using a balun.

The invention relates to the technical field of microscopic computed tomography, and discloses a large-caliber paraboloid type single glass tube microscopic CT system and a reconstruction method thereof. The system comprises an X-ray source, a straight-through X-ray shielding device, a first lens, a sample and an X-ray flat panel detector which are sequentially arranged along an optical axis, wherein the first lens is supported by a lens bracket to move; the sample is supported by a sample table; the first lens is a millimeter-level large-aperture paraboloid type glass tube lens, and the lens support is used for adjusting the angle, pitching and optical axis coaxiality of the first lens; the electric control platform controller is electrically connected with the lens support and the sample table, and the main control computer controls the sample table to conduct angle scanning, sub-pixel angle jitter sampling and multi-view-field splicing scanning through the electric control platform controller. The millimeter-grade large-caliber paraboloid type glass tube lens is adopted, and quasi-parallel beam geometry is regulated and controlled by the system, so that the microscopic CT system can be compatible with a parallel beam algorithm, and the image reconstruction quality of an original cone beam algorithm is reserved and improved.

The invention discloses a phased array X-ray source, a phased array plane CT scanning system and a phased array plane CT scanning method. The phased array X-ray source comprises a cathode assembly, an anode target assembly distributed around a first axis and a control unit. And the control unit controls the cathode assembly to sequentially bombard the anode target units at different positions on the annular target in a time-sharing manner to generate X-rays, so that multi-angle emission without mechanical motion is realized, and the axes of conical beams of the X-rays emitted by the target units accurately intersect at the same intersection point. The CT scanning system comprises an objective table, a detector array and an image processing unit. During scanning, the detection point of the detected object is located at the intersection point, the radiation source and the detector are kept fixed, multi-angle projection acquisition is completed through electronic scanning, and a three-dimensional image is reconstructed. A mechanical rotating mechanism is thoroughly eliminated, the scanning efficiency and the system reliability are remarkably improved, meanwhile, the useless radiation dosage is greatly reduced through ray precise convergence, and the system is particularly suitable for local high-precision nondestructive testing of radiation sensitive devices.

The invention provides a dual-band omnidirectional antenna with a multiplexing structure, which belongs to the technical field of communication antennae, comprises a multilayer dielectric substrate, a conductive film structure and a cured sheet lamination, and adopts a micro-strip circular patch antenna in a microwave frequency band to realize conical wave beam omnidirectional coverage. 360-degree beam scanning in an azimuth plane is realized in a millimeter wave frequency band through the magnetoelectric monopole ring array. The millimeter wave antenna structure multiplexes the microwave circular patch, the short circuit column and the metal ground plane, and common-caliber integration of the dual-band radiation unit, structure sharing of low-frequency and high-frequency channels and high isolation are achieved. The scheme has the capabilities of miniaturization, millimeter wave frequency band high gain, broadband and beam regulation and control, and is suitable for the application requirement of microwave and millimeter wave double-frequency omnidirectional coverage in a future wireless communication system.