97results about How to "Large scanning angle" patented technology

The invention provides an electric control scanning waveguide leaky-wave antenna based on liquid crystal, belongs to the technical field of microwave antenna engineering, and aims at solving problems that a conventional electric control scanning leaky-wave antenna based on a varactor and other conventional electrically controlled elements is difficult to work at a microwave high-frequency band, and existing liquid crystal electric control scanning leaky-wave antennas require the special design of a bias circuit. The electric control scanning waveguide leaky-wave antenna comprises a top part dielectric plate layer, a metal layer, an insulation paste layer, a liquid crystal layer and a bottom part waveguide slot. The metal layer is arranged at the lower surface of the top part dielectric plate layer. The metal layer has a leaky-wave structure with etching of periodic transverse seams. Equivalent series inductance of electromagnetic wave is enabled to be increased by the periodic transverse seams when electromagnetic wave is transmitted between the bottom part waveguide slot and the metal layer. The metal layer is provided with N periodic seam units. Seam unit spacing distance p is from lambdag / 2 to lambdag. The seams of the middle part are main radiation units. Seam length l of the main radiation unit is from lambdag / 4 to lambdag / 2. The former four and the latter four seams are auxiliary radiation units.

An optical scanning device is disclosed that is manufactured through a simple mounting process and is provided with a hermetically sealed oscillation space for an oscillation mirror. The optical scanning device includes plural drive electrodes for driving the oscillation mirror and plural external electrodes of the drive electrodes that are formed at the same height.

The invention discloses an optical phased array two-dimensional laser radar scanning chip based on polarization multiplexing. The signal light is input into a connecting waveguide through a tunable laser; a TE mode or a TM mode is selected through a polarization selection switch, and then a cascaded optical splitter is input through the connecting waveguide to enable optical power to be divided equally; then the light is input to a phase modulation array through the connecting waveguide; phase modulation can be carried out on a waveguide array element by adopting an external circuit application voltage; an optical field with different phases is input into an output coupling grating array of one-dimensional arrangement through an output connecting waveguide to be transmitted, and the two-dimensional scanning of the emergent wave beam is realized; the light field with an inclined near field phase surface is subjected to beam deflection in a far field coherent superposition mode in one dimensionality, so that the dynamic scanning of the light beam can be controlled through external voltage regulation; and the light beam scanning of the other dimensionality is realized by changing thewavelength of the input light through the tunable laser. The laser radar scanning chip has the advantages of low cost, high stability, easiness in single-chip photoelectric integration and the like, and is beneficial to realizing the laser radar controlled by all-solid-state light beams.

A biaxial micro-electromechanical (MEMS) device is disclosed. The device includes a gimbal rotatable about a gimbal axis of rotation. A pair of gimbal torsion bars connects the gimbal to a support along the gimbal rotation axis. A mirror plate is rotatable about a mirror axis of rotation, the mirror plate rotation axis being substantially perpendicular to the gimbal rotation axis. A pair of mirror plate torsion bars connects the mirror plate to the gimbal along the mirror plate axis of rotation. One or more gimbal moment-of-inertia-altering blocks are positioned on a surface of the mirror plate away from the gimbal axis of rotation. Additionally, one or more mirror plate moment-of-inertia-altering blocks are positioned on a surface of the mirror plate away from the mirror plate rotation axis such that the distance from the mirror plate axis determines a resonant frequency of the biaxial MEMS device.

The invention relates to a resonant scanning mirror, a scanning method, a scanning angle measurement method and a resonant scanning mirror processing method. The resonant scanning mirror comprises a steel sheet, a magnet, a driving coil and an angle measurement coil, wherein the steel sheet comprises a first torsion shaft and an inner frame connected with the first torsion shaft, the inner frame is provided with a smooth surface suitable for beam reflection, the magnet is suitable for generating the single-directed magnetic field at the level of the steel sheet, the driving coil is arranged inthe inner frame of the steel sheet and is suitable for bearing the force in the magnetic field generated by the magnet to drive the inner frame to rotate when a driving current is inputted, and the angle measurement coil is arranged in the inner frame of the steel sheet and is suitable for measuring a scanning angle of the inner frame. The resonant scanning mirror is advantaged in that on one hand, large-aperture and large-angle scanning can be realized with relatively low cost, on the other hand, a piezoresistive or capacitance measurement angle measurement realization method in the MEMS process is simplified, the process is simple, and cost is low.

The invention discloses a double-scanning view filed shared window laser radar system based on a micromirror, the laser beam generated by a laser is divided into two paths through a laser beam splitter, one path of laser light beams is emitted to the micro-mirror through a first through hole, and is emitted to a detection target through the micro-mirror; and the other path of laser light beam is reflected by a reflector and then is emitted to the micromirror through a second through hole, and is emitted to the detection target through the micro-mirror; the laser beams emitted to the micromirror through the first through hole and the second through hole have a first included angle theta; the echo light beams reflected from the detection target are reflected to the first single-side reflector and the second single-side reflector through the micromirror, and are received by the corresponding light detectors. According to the invention, the laser beam splitter is used for doubly scanning the view field, and the laser radar system can achieve a large enough scanning angle, and is particularly suitable for being applied to full-automatic driving with high requirement on a scanning view field.

One embodiment of the invention discloses a laser radar and a laser radar control method. The laser radar comprises 2N+1 laser emitters for emitting laser; a vibrating mirror for changing the opticalpath direction of the emitted laser; N is an integer and N is no less than zero. According to the embodiment, since the laser emitters are added, the scanning scope of laser radar is enlarged and therefore the scanning angle of the laser radar is increased.

A two-dimensional scanning and reflecting device includes a vibration component and a scanning component. The vibration component has a free end. The scanning component includes a frame body, a mass block, and a mirror. The frame body is connected to the free end of the vibration component. A natural frequency of the mirror corresponds to a second frequency. The mass block is disposed on the frame body in an eccentric manner, and the mass block and the natural frequency of the mirror correspond to a first frequency. When the vibration component receives a multi-frequency signal having the first frequency and the second frequency, the mirror vibrates in an axial direction with the first frequency, and vibrates in another axial direction with the second frequency.

The invention relates to a low-cost millimeter wave beam scanning antenna applied to a 5G mobile terminal, which is suitable for the field of mobile communication. The low-cost millimeter wave beam scanning antenna comprises a patch array, a floor provided with a coupling groove and a feed microstrip line provided with a 2-bit phase shifter; the patch array is formed by ten equally spaced rectangular patch units; the lower portion of each patch unit is provided with a pair of coupling grooves, the lower portion of each pair of coupling grooves is provided with one 2-bit phase shifter, each phase shifter leads out four branch microstrip lines from the center feed microstrip line, and the length of each branch line is controlled by a binary switch to provide a phase change of 0 degree, 90 degrees, 180 degrees and 270 degrees. The traveling wave feature of the leaky wave antenna is employed to construct the phase shifter to reduce the antenna cost, and the radiation antenna and the feed network are respectively put at two sides of the floor to increase the degree-of-freedom of design.

The invention discloses a liquid crystal optical waveguide and laser radar. The liquid crystal optical waveguide comprises a liquid crystal assembly, a waveguide core, a cladding layer and a first conductive film. When the first conductive film is not connected with a first electrode, the waveguide core is in a mode guiding mode, and therefore, when the laser beams enter the waveguide core, the laser beams can carry out total reflection propagation in the waveguide core. Due to the fact that the first conductive film is arranged on one side of the liquid crystal assembly, when the first conductive film is connected with the first electrode, the liquid crystal assembly is in an electric field, so that the liquid crystal molecules can be re-ordered under the action of the electric field, andthe refractive index of the liquid crystal assembly is changed, and at the moment, the waveguide core is in a radiation mode state. When the laser beams are emitted into the waveguide core, the laserbeams can be refracted into the liquid crystal assembly, and the original laser beams can be deflected under the action of the liquid crystal molecules, so that the laser beams can be emitted at different angles, and therefore, the laser beams can complete scanning of the plane direction of the vertical waveguide core.

The invention relates to a laser projection system which comprises a projection screen and a laser projector, wherein the projection screen comprises at least one light emitting layer, and the light emitting layer comprises at least one light emitting substance which can be excited to generate excited light in another wavelength range when irradiated by exciting light in a wavelength range; the transverse distances between the light emitting substances parallel to the plane of the projection screen are far shorter than the cross section diameter of a laser beam; and the laser projector comprises a laser light source module, a laser signal modulation module, a light combining module, a rotary plane mirror module, a rotary plane mirror control module and a signal conversion module. In the invention, exciting laser is generated according to an image signal of a single picture or a dynamic picture and projected to the matched projection screen to generate an image so as to ensure that a high-recognition projection picture can be presented on the projection screen under natural light environment through a nearly transparent effect, and a user can see the projected picture and an objectbehind the projection screen at the same time so as to promote the use efficiency and the application range of the laser projection system.

The invention discloses a band-pass wide-stopband reconfigurable frequency selective surface (FSS). The FSS comprises a diode switch structure, and a mixed cycle surface structure (4), wherein the diode switch structure comprises a first dielectric layer (2); a first metal strip array (1) is arranged on the upper surface of the first dielectric layer (2); and a second metal strip array (3) is arranged on the lower surface of the first dielectric layer (2), and is fixed with the upper surface of the mixed cycle surface structure (4). The band-pass wide-stopband reconfigurable FSS has the advantages that through on / off control on PIN diodes in the first metal strip array (1) and the second metal strip array (3), switching between a transmission status and a cutoff status of the FSS can be achieved; when an antenna works, energy radiated by the antenna can pass through the FSS with lower loss; when the antenna does not work, the FSS totally reflects external electromagnetic waves; and therefore, compared with the traditional band-pass FSS, the band-pass wide-stopband reconfigurable FSS is more practical and controllable.

The invention discloses a terahertz rapid two-dimensional scanning system and method. The scanning system is composed of a transmitting antenna, a receiving antenna, a planar reflection mirror, a first scanning motor, and a second scanning motor. The receiving direction of the receiving antenna is parallel to the transmitting direction of the transmitting antenna. A transmitting antenna wave beam of the transmitting antenna is reflected to a scanning area by the planar reflection mirror and a receiving antenna wave beam formed at the scanning area is reflected to the receiving antenna by the planar reflection mirror, so that the transmitting antenna wave beam and the receiving antenna wave beam moves synchronously. A rotating shaft of the first scanning motor is connected to the planar reflection mirror, so that the planar reflection mirror rotates around a horizontal plane. A rotating shaft of the second scanning motor is perpendicular to the horizontal plane to control the first scanning motor and the planar reflection mirror to rotate around a plumb line. The scanning angle is large and the imaging speed is fast.

The invention discloses intraoperative three-dimensional CT equipment based on a mobile convolutional C-shaped arm and belongs to the technical field of medical equipment. The equipment mainly comprises a C-shaped mother arm, a C-shaped sub arm, a C arm rotation shaft, a C arm base, an X-ray transmission device, an X-ray receiving device, an X-ray bulb tube and an X-ray detection array tube. The convex side surface of the C-shaped mother arm is connected with the C arm rotation shaft through a C-shaped sliding rail, the C arm base is connected to the lower portion of the C arm rotation shaft,and an arc groove is formed in the middle line of the concave surface side of the C-shaped mother arm; a pusher is arranged at one end of the C-shaped sub arm, the C-shaped sub arm slides along the arc groove under pushing of the pusher, and finally the C-shaped sub arm and the C-shaped mother arm form an O-shaped arm; the X-ray transmission device and the X-ray receiving device are arranged at the two ends of the C-shaped mother arm respectively, the X-ray bulb tube is arranged on the concave side surface of the C-shaped sub arm, and the X-ray detection array tube is arranged on the inner bottom of the arc groove. In a word, the intraoperative three-dimensional CT equipment is reasonable in design, few in scanning blind area and diverse in function.

The invention discloses a control system and method for a laser radar galvanometer servo motor. The system comprises an upper computer, a drive control digital module, a three-loop control analog module, a high-frequency pulse laser front end and a scanning galvanometer, and the drive control digital module comprises a main control ARM unit and an FPGA unit, which are connected with each other. The method comprises the following steps: after the galvanometer servo motor starts to work smoothly, judging whether the system performs scanning in a working mode with the highest performance, judgingthe mode according to a set threshold, and adopting two index improvement methods: in a smooth speed running mode, importing an interpolation module to improve the resolution of a control signal so as to achieve the purpose of high-precision scanning; and in a high-speed scanning mode, importing a repeated tracking accumulated error control unit to perform error collection and correction for multiple cycles so as to achieve the purpose of improving the precision. The control system disclosed by the invention ensures stable and efficient operation of a high-precision three-dimensional imagingscanning system in a high speed state.

The invention provides a high density photon integrated waveguide grating array which is used for the device transmitting multipath optical signals. The high density photon integrated waveguide grating array comprises three or more parallel arranged waveguide gratings. The propagation constant of each waveguide grating is different from that of other adjacent waveguide gratings. The period of eachgrating is related to the propagation constant of the waveguide. The optical signals pass through different waveguide gratings and can be emergent at the same angle. The interval between the waveguide gratings is small so that the array is suitable for the optical phased array antenna. Large-angle transverse scanning is realized by changing the relative phase difference among all the waveguide gratings so as to have quite wide application prospect in the field of laser radar, medical imaging and wireless communication.

The invention relates to an antenna, and in particular relates to a one-dimensional circularly polarized antenna for realizing beam scanning in an electric control mode and a control method thereof. The invention discloses the one-dimensional circularly polarized antenna for realizing beam scanning in an electric control mode. The one-dimensional circularly polarized antenna comprises a circularlypolarized radiation unit array, a first dielectric substrate, a prepreg and a traveling wave feed structure. The prepreg is arranged on the traveling wave feed structure. The first dielectric substrate is arranged on the prepreg, and the circularly polarized radiation unit array is arranged on the first dielectric substrate. The circularly polarized radiation unit array comprises two rows of circularly polarized units. The traveling wave feed structure comprises a traveling wave waveguide structure. The traveling wave waveguide structure is provided with a slot array, and the traveling wave waveguide structure is further provided with a diode array. The antenna provided by the invention has the characteristics of low cost, high gain, wide-angle scanning and circular polarization.

The invention provides a lidar scanning device based on multi-spatial light modulator splicing, and the device comprises a light source component, a beam splitting prism, a detection target and a spatial light modulator, wherein the light beam emitted by the light source component reaches the detection target through the spatial light modulator and the beam splitting prism in order, or the light beam emitted by the light source component reaches the detection target through the beam splitting prism and the spatial light modulator in order. The lidar scanning device provided by the invention utilizes the phase modulation capability of the spatial light modulator to control the shape and deflection direction of the light beam, generates a multi-point laser dot matrix at one time, and then quickly generates a laser scanning dot matrix by combining the timing refresh capability of the spatial light modulator to complete the scanning and detection of the target space, thereby improving theworking efficiency of the lidar system.

The invention discloses a dual-frequency common-caliber VICTS phased-array antenna. The antenna comprises a radiation layer, a parallel plate waveguide layer and a feed network layer which are sequentially arranged from top to bottom, the feed network layer is used for accessing external TE mode electromagnetic waves, converting the accessed TE mode electromagnetic waves into TEM mode electromagnetic waves and outputting the electromagnetic waves to the parallel plate waveguide layer, the parallel plate waveguide layer is used for transmitting the TEM mode electromagnetic waves input into the parallel plate waveguide layer to the radiation layer in an air medium conduction mode, and the radiation layer is used for transmitting the TEM mode electromagnetic waves transmitted to the radiation layer to a free space. The antenna has the advantages that: two frequency bands of a mobile satellite communication system can be covered at the same time, and the area, cost and power consumption of the mobile satellite communication system can be reduced when the antenna is used for the mobile satellite communication system.

The invention discloses a CTS frequency sweep antenna with a large frequency sweep ratio. The CTS frequency sweep antenna comprises a radiation layer and a broadband line source layer which are sequentially arranged from the top down, the broadband line source layer is used for converting electromagnetic waves which are input into the broadband line source layer and at different frequencies into plane waves at different frequencies and transmitting the plane waves to the radiation layer, the radiation layer is used for radiating the plane waves which are transmitted into the radiation layer and at different frequencies to a free space in different beam angles, and the radiation layer is realized by adopting a nonuniform zigzag slow-wave structure. The CTS frequency sweep antenna disclosedby the invention has the advantages that a beam scanning angle in a frequency band range is relatively large and the frequency sweep ratio is relatively high.

The invention provides an intelligent fire fighting system used for an offshore wind generating set, which is used for carrying out remote intelligent control and fire fighting on the offshore wind generating set to better protect the safety of the offshore wind generating set. The intelligent fire fighting system comprises an MPU (Micro Processor Unit) controller, a control center, an alarm, a detection module and a fire extinguisher, wherein the MPU controller and the control center are mutually connected; the alarm, the detection module and the fire extinguisher are respectively connected with the MPU controller; and the MPU controller is used for processing detection information of the detection module, transmitting processed information to the control center and controlling the opening of the fire extinguisher according to a control command returned by the control center.

The invention provides a curved-surface special-shaped MEMS two-dimensional scanning micro-mirror which comprises an outer frame, an inner frame, a coil, a curved-surface mirror surface, a fast axis and a slow axis. The curved-surface mirror surface is located in the center of the overall structure and connected with the inner frame through the fast axis, and the inner frame is connected with the outer frame through the slow axis. The curved-surface mirror surface adopts a spherical crown surface and is a curved surface left after a spherical surface is cut by a plane. The coil is built-in, an external permanent magnet provides a magnetic field forming a 45-degree angle with the micro-mirror, torsion of torsion arm beams of the fast axis and the slow axis is controlled through the Lorentz force in the Z direction, and scanning of the slow axis and the fast axis, namely the Y axis and the X axis, is realized. Under the control of electromagnetic force, the curved-surface special-shaped two-dimensional scanning micro-mirror realizes periodical and high-frequency swing on the X axis and the Y axis. According to the MEMS two-dimensional scanning micro-mirror, a curved-surface special-shaped structure is adopted, a plane mirror is replaced by a curved-surface mirror, the scanning view field of the MEMS two-dimensional scanning micro-mirror is greatly increased, and the scanning angle of a laser radar is increased.

The invention discloses a piezoelectric integrated MOEMS scanning raster micromirror and relates to the field of spectrum analysis and micro optical electro mechanical systems. The piezoelectric integrated MOEMS scanning raster micromirror consists of an integrated scanning raster micromirror, a torsion beam, a connecting beam, an angle sensor, a piezoelectric micro driver and a fixing frame. The integrated scanning raster micromirror is based on monotectic orientation (111) silicon substrate, a blazed grating is integrated on the front side, a groove is sapped in the back side, and the diffraction efficiency and device robustness are improved. For achieving large-angle scanning under low-drive voltage, the piezoelectric micro driver and the connecting beam are adopted to amplify drive displacement. For monitoring the motion state of the integrated scanning raster micromirror in real time, the piezoelectric angle sensor is integrally integrated on the connecting beam. The piezoelectric integrated MOEMS scanning raster micromirror is novel and simple in structure and compatible with an integration process, the diffraction efficiency, resolution ratio, robustness and integration level of the scanning raster micromirror can be remarkably improved, and the driving and angle sensing properties of the scanning raster micromirror are improved.

The invention discloses an abnormal broadband acousto-optic deflection device. An acousto-optic medium is arranged inside a base; a lower electrode layer, a bonding layer and an upper electrode layer are arranged on the sound transmission surface of the acousto-optic medium; an energy converter is arranged on the upper electrode layer; the energy converter is provided with a first surface electrode and a second surface electrode. The acousto-optic medium is a gallium phoshpide crystal, an included angle beta between the direction of the sound transmission surface of the acousto-optic medium and the axis of the gallium phoshpide crystal [001] is smaller than 5 degree, and the optical axis is vertical to the light incoming surface; the energy converter is made of X cutting type lithium niobate crystal for stimulating transverse waves, and the thickness of the energy converter is 1.4-1.6 microns; a correction included angel theta is formed between the light incoming surface and the light outgoing surface of the acousto-optic medium, and the correction included angel theta enables diffracted light to be symmetrical about the optical axis in a working frequency range. According to the abnormal broadband acousto-optic defection device, the scanning angle of the diffracted light is increased, the diffraction efficiency is improved, and the volume of a signal processing system is greatly reduced.

The invention relates to a frequency scanning reflecting grating antenna. The frequency scanning reflecting grating antenna comprises a plurality of reflecting units, wherein the reflecting units are arrayed periodically in a two-dimensional manner; each reflecting unit comprises metal grid bars, a top layer, a bottom layer and a metal bottom plate; each metal bottom plate is arranged on the bottom of the corresponding reflecting unit; the top of each reflecting unit is provided with the corresponding metal grid bars; each top layer and the corresponding bottom layer are fixedly connected between the corresponding metal grid bars and the corresponding metal bottom plate; the bottoms of the metal grid bars of each reflecting unit are fixedly connected to the top of the corresponding top layer; each bottom layer is fixedly connected between the bottom of the corresponding top layer and the top of the corresponding metal bottom plate; each top layer and the corresponding bottom layer are multi-media layers with different dielectric constants; and the multi-media layers restrain mirror reflecting waves. The antenna can be used for scanning in a large-angle range of a frequency band nearby 0.2THz, and has properties of high gain and low mirror reflecting minor lobe. The invention also provides a mirror reflecting wave restraining method.

The invention discloses a scanning mirror which comprises a laser reflection module and a laser feedback module. The laser reflection module is used for reflecting laser. The laser feedback module enables the scanning mirror to operate at a fixed scanning amplitude and a fixed frequency through feedback compensation of the amplitude and frequency of the scanning mirror. The invention further discloses a scanning method of the scanning mirror. According to the invention, the scanning mirror has a large scanning angle, and can realize optical scanning of plus or minus 15 degrees; the scanning frequency is greater than 300 Hz; the mirror size of the scanning mirror is equal to or greater than 10mm*10mm; and the scanning mirror can operate at the fixed scanning amplitude and the fixed frequency.

The invention, which belongs to the technical field of optical displaying, provides a high-speed optical scanning display device. The structure of the device is characterized in that the device comprises a light source (1) a micro drift angle generation module (2), a local ellipsoidal reflector (3) and a receiving screen (4), wherein the micro drift angle generation module (2), the local ellipsoidal reflector (3) and the receiving screen (4) are successively arranged along an optical path. The micro drift angle generation module (2) enables a micro drift angle of light to occur; the local ellipsoidal reflector (3) is used for amplifying the drift angle; and then a light spot for scanning with a control signal is formed at the receiving screen (4) so that image displaying is realized. According to the invention, problems of poor precision and difficult stability control of optical machine scanning as well as a small scanning angle of acousto-optic scanning can be solved. The display device has the characteristics of high scanning precision and high stability; and the micro angle change of the light can be amplified to 1 to 4 magnitude orders.