77results about How to "Small divergence" patented technology

The invention discloses a large building deformation monitoring device and a monitoring method through the large building deformation monitoring device. A laser transmitter of the large building deformation monitoring device is composed of a laser controller, a laser power supply and a laser collimator, wherein the laser controller is connected with the laser power supply, and the laser power supply is connected with the laser collimator. A laser receiver is composed of a semi-permeable laser target, a light shield, an image sensor, and an attitude sensor, wherein the semi-permeable laser target is connected with the light shield, the light shield is connected with the image sensor, and the image sensor, the attitude sensor and a wireless transmitter are respectively connected with a microprocessor, and therefore the large building deformation monitoring device is formed. The method monitoring method through the large building deformation monitoring device includes that the laser transmitter is mounted at a reference position which is close to an object to be tested and is relatively fixed; the laser receiver is mounted at a point to be tested on a deformation surface; and the linear displacement, perpendicular to the deformation surface, of the laser receiver is the deformation value of the point. According to the large building deformation monitoring device, laser is utilized for testing deformation, and therefore the large building deformation monitoring device is convenient to install and test, high in accuracy, and suitable for long-time on-line monitoring of the deformation of large buildings.

Disclosed is a geodetic target object comprising at least one reflector surface, a receive channel with a detector (18) for receiving electromagnetic radiation (ES) transmitted by a measuring unit (2''), and a transmit channel with a radiation source (13'). The associated transmission port and/or reception port is/are integrated into the reflector surface or is/are embodied so as to adjoin the reflector surface such that radiation (RS) that is modulated for transmitting data can be transmitted in the direction of the measuring unit (2'') within the cross section (5'') of the radiation (ES) generated by the measuring unit (2'').

The invention discloses a fingerprint locating method and server. An establishing stage and an updating stage of a fingerprint database are carried out simultaneously, and the problem that a traditional fingerprint locating method firstly and manually establishes a fingerprint database to consume a lot of labor and materials and be small in coverage density and unchanged in fingerprint database is solved. In actual engineering application, the fingerprint database is automatically established and continuously updated automatically to keep pace with the environmental change, so that resources are saved, and the locating accuracy is improved. The fingerprint database is in a steady state finally and can further slowly adapt to the environmental change. In statistical time, the locating accuracy of the fingerprint locating method and server is stable, the fingerprint locating method and server is better than a traditional locating algorithm, and the divergence of the locating accuracy of the traditional locating algorithm on the same point in different moments is reduced.

The invention discloses a multi-mode fiber LIBS detector based on a composite constraint enhanced spectrum. The multi-mode fiber LIBS detector comprises a LIBS probe, a coupling collection system, anda control detection system, wherein the LIBS probe is composed of a fiber coupling head and a focusing chamber; the coupling collection system comprises a dichroscope, a fiber focusing device, and afiber collector; and the control detection system comprises a nanosecond laser, a spectrometer, a programmable pulse delay generator, an ICCD, and a computer. The multi-mode fiber is taken as a transmission medium, laser is focused to the surface of a to-be-measured sample to break induced plasma according to a convex lens imaging rule, and the element spectrum intensity is increased by a composite constraint enhanced plasma radiation method. The detector can realize simultaneous analysis of a plurality of elements, has the advantages of safe and reliable operation, high sensitivity, high measurement precision, high spectral signal-to-noise ratio, low element detecting limit, fast analysis speed, and high efficiency, realizes remote on-line monitoring, and can effectively satisfy the disadvantages of the traditional fiber LIBS detectors.

A surface emitting laser diode comprises a substrate, a lower reflector formed over the substrate, an active layer formed over the lower reflector, an upper reflector formed over the active layer, a current restrict structure including a current confinement region surrounded by insulation region. The current restrict structure is disposed in an upper reflector or between an active layer and the upper reflector, and an upper electrode formed over the upper reflector includes an aperture which corresponds to an emission region from which light is emitted in a first direction perpendicular to a surface of a substrate. The emission region and the current restrict structure including the current confinement region are selectively configured to obtain high single transverse mode, stabilized polarization direction, isotropic beam cross section and small divergence angle, while allowing the device to he manufactured with high yield rate.

Optical semiconductor light guide device having a low divergence emergent beam, application to Fabry-P+E,acu e+EE rot and distributed feedback lasers. According to the invention, the core of the guide of the device comprises at least one semiconductor layer (8), whose refractive index is higher than that of each of the confinement or cladding layers (4, 6) of the guide and at least one second semiconductor layer (10), whose refractive index is lower than that of each of the confinement or cladding layers or close thereto. Application to optical telecommunications.

The invention discloses a device for measuring the shade number of an automatic darkening welding filter, comprising a laser, a photoelectric detector and a signal processing unit, wherein laser light emitted by the laser is received by the photoelectric detector after passing through the filter and then converted into an electric signal; and the electric signal is processed by the signal processing unit to obtain the shade number of the tested filter, wherein the wavelength of the laser light is 532 nm; and the computational formula of the signal processing unit is N=B+klog10I, wherein N is the shade number, I is a current or a voltage, and B and k are the parameters of the test system. The invention also discloses a method for measuring the shade number of an automatic darkening welding filter.

The invention discloses a variational Bayesian parameter learning method based harmonic current detection algorithm for an electric vehicle charging station. The algorithm includes establishing a charger equivalent circuit model, and judging whether a charging pile can be randomly accessed into a power distribution network system by utilizing a random number algorithm and a comparison module; performing ideal superposition calculation on the harmonic current meeting gaussian normal distribution so that an ideal harmonic superposition coefficient calculation method can be obtained; and performing sampling on harmonic phase to form two sets of random set of state space and measurement space, obtaining model parameters through the lower bound of a logarithmic edge likelihood function by usinga variational Bayesian parameter learning method, continuously maximizing the lower bound of the likelihood function, and iteratively updating variational phase parameters until approximate distribution approaches the true posterior distribution of the parameters so that harmonic phase superposition detection can be realized. Actual harmonic superposition coefficients can be obtained by substituting harmonic phase distribution into the harmonic superposition coefficient calculation method, so that accurate detection of multi-harmonic current superposition at same time in a charging station can be realized.

A method and system for producing an ion beam from an ion guide. In the method, ions are introduced into the ion guide, a radio frequency trapping field is generated in the ion guide to confine ions in a direction transverse to a longitudinal axis of the ion guide, a DC potential is generated along the longitudinal axis to direct ion motion along the longitudinal axis, a strength of the radio frequency trapping field is reduced toward an ion guide exit of the ion guide, and the ions are transmitted from the ion guide exit to form the ion beam. In the system, an ion guide is configured to transmit ions in a longitudinal axis of the ion guide and configured to trap ions in a direction transverse to the longitudinal axis via a radio frequency trapping field. The ion guide includes a segmented set of electrodes spaced along the longitudinal axis and an ion guide exit at the last of the segmented set of electrodes. A radio frequency device is configured to supply the radio frequency trapping field such that a strength of the radio frequency trapping field is reduced toward the ion guide exit.

The invention belongs to the field of high-energy physical technologies, and particularly relates to a de-dispersion deflection device for a high-energy electron beam. The technical scheme includes that the de-dispersion deflection device for the high-energy electron beam comprises a vacuum box, a magnetic component, a coil, an input flange, a straight beam output window, a bending beam output window and a magnetic block blocking component. An electron beam enters to the inner portion of the vacuum box in the 20-degree horizontal included angle direction from left to right and the electron beam after being dispersed by the magnet A enters a magnet B, second-time deflection and dispersion are carried out under the action of magnetic fields, the direction of a magnetic field of the magnet B is just opposite to the direction of a magnetic field of a magnet A14, and therefore the electron beam after being diffused by the magnet A begins to gather in the magnet B and then enters a magnet C, under the action of a magnetic field of the magnet C, the electron beam deflects and gathers and then shoots out downwards, and 110-degree deflection is achieved. The de-dispersion deflection device for the high-energy electron beam enables the electron after being deflected to be less in divergence degree, using requirement of an electron acceleration scheduler is satisfied, meanwhile, total height of the electron acceleration scheduler is satisfied, and therefore effective using and operating space is effectively increased.

The embodiment of the invention discloses a millimeter wave wireless charging device which comprises a millimeter wave generator used for generating and emitting millimeter waves, wherein the millimeter waves are used for charging to-be-charged equipment. The device further comprises a laser sight and a rotating platform, wherein the laser sight is fixedly mounted on the millimeter wave generator and used for emitting and receiving laser beams; the laser beams and the millimeter waves are the same in emission direction; the millimeter wave generator is fixedly connected to the outer surface of the rotating platform; the rotating platform is used for adjusting the direction of the millimeter waves emitted by the millimeter wave generator through rotation. The laser sight is further used for calculating the corresponding reflectivity of the received laser beams and generating a first control signal used for controlling the rotating platform to pause rotating and a second control signal used for controlling the rotating platform to rotate according to the reflectivity. After the adoption of the millimeter wave wireless charging device provided by the invention, the wireless charging efficiency can be improved.

The invention discloses an optical film of a multilayer structure. The optical film comprises a first surface, a second surface arranged in parallel in the opposite side of the first surface, and a stack of N positive-refractive-index micro layers, the stack of N positive-refractive-index micro layers is arranged between the first and second surface and are set as adjacent micro layers, the refractive indexes of the N-1 positive-refractive-index micro layers are decreased successively from the first surface to the second surface, the refractive index of the N th positive-refractive-index microlayers is greater than that of the (N-1)th positive-refractive-index micro layer, at least one negative-refractive-index micro layer is arranged among the Nth positive-refractive-index micro layer from the first surface to the second surface, so that the optical film of the multilayer structure has a high reflectivity for incident light from the first surface to the second surface and high transmittance for incident light from the second surface to the first surface.

The present invention discloses a structured light projector, an optoelectronic device and an electronic device. The structured light projector comprises a laser emitter, a collimation element, a first diffraction element and a condensation element. The laser emitter is configured to emit laser. The collimation element is configured to perform collimation of laser emitted by the laser emitter. Thefirst diffraction element is configured to perform diffraction of laser after collimation by the collimation element. The condensation element is configured to collect laser after diffraction by thefirst diffraction element to reduce the laser divergence. The structured light projector, the optoelectronic device and the electronic device provided by the embodiment of the invention provide a condensation element to reduce the divergence of the whole light beam, in the axis Z direction, corresponding to an emitting laser pattern, and the energy of the laser cannot be attenuated too fast. Eventhough, a distance between a user and a structured light projector is large, an image collector can receive reflected laser with large energy so as to further generate a laser pattern with enough brightness after modulation by users and facilitate obtaining of a depth image.

The invention relates to a car body deformation detector based on laser transmission. The car body deformation detector comprises a front axle of a car and a rear axle as well as a first lateral axle and a second lateral axle located at two sides; a laser unit and a first metal reflecting plate are arranged on the front axle; a second metal reflecting plate is arranged on the first lateral axle; a third metal reflecting plate and a fourth metal reflecting plate are arranged on the rear axle; a receiving plate capable of detecting laser positions is arranged on the second lateral axle; the first metal reflecting plate, the second metal reflecting plate, the third metal reflecting plate, the fourth metal reflecting plate and the receiving plate are arranged vertically; laser emitted by the laser unit arrives at the receiving plate via the first metal reflecting plate, the second metal reflecting plate, the third metal reflecting plate and the fourth metal reflecting plate; the deformation position and the deformation degree of the car body are judged by the laser position on the receiving plate. The car body deformation detector based on laser transmission is quick and convenient to detect the deformation position and the deformation degree of the car body, is capable of positioning the whole deformation of the car body and has low detection cost.

The invention discloses a preparation method for a magnesium-aluminum alloy. The method comprises the following steps that (1) activating treatment and melting treatment are conducted, specifically, magnesium powder, aluminum powder, zinc powder, manganese powder, copper powder, silica powder, iron powder, nickel powder, beryllium powder and a rare earth compound and calcium silicate composition are placed into smelting equipment to be heated to 500-550 DEG C, subjected to activating treatment for 10-12 h under 3-10 MPa pressure conditions, then heated to 730-750 DEG C, and subjected to melting treatment for 8-10 h to obtain molten materials; and (2) die-casting forming is conducted, specifically, a secondary injection mode is adopted, the molten materials are compression-injected into a die with the surface coated with a release agent in a die-casting machine, and the finished magnesium-aluminum alloy is obtained. According to the preparation method for the magnesium-aluminum alloy, the material sources are wide, the cost is low, and the machining cost can be greatly lowered; and the prepared magnesium-aluminum alloy further has excellent mechanical performance, the application market for the magnesium-aluminum alloy is greatly expanded, and the alloy has wide popularization prospects.

The invention discloses an installation platform for a sheet light source emitter in a small wind tunnel PIV measurement system and a using method of the installation platform. The installation platform comprises a bottom installation platform, a leading screw motion system, a telescopic bending type support system and a hollow rotating installation system; the laser sheet light source emitter isfixedly mounted on a hollow rotation platform, and moves in a 3D space via the hollow rotation platform, the telescopic bending type support system and the bottom leading screw motion system. Thus, the laser sheet light source emitter is fixedly mounted, rotates and moves during a PIV experiment so that the sheet light source is arranged at any angle vertical to the bottom surface and two side surfaces of a wind tunnel, a developing paper arrangement platform is arranged to obtain an optimal irradiation distance of the sheet light source in a to-be-measured object, and thus, flow field data indifferent measurement planes can be collected accurately during small wind tunnel PIV test. The device can be suitable for PIV measurement experiments with different measurement plane requirements.

The invention discloses a pole piece coating drying device. The device comprises a pole piece conveying mechanism, an isolation hood and a laser light source system, wherein the pole piece conveying mechanism is used for enabling a pole piece material roll subjected to coating to continuously pass through a laser drying area, the isolation hood is used for relatively isolating the laser drying area from an external environment, the laser light source system is arranged in the isolation hood, is used for outputting laser to dry the pole piece material roll and comprises a plurality of laser modules, each laser module comprises a plurality of laser units arranged in a width direction of the pole piece material roll, each laser module generates small-area light spots, widths of which are not less than a width of the pole piece material roll, and the plurality of laser modules are arranged in a length direction of the pole piece material roll, so that the small-area light spots generated by the plurality of laser modules are spliced into large-area light spots in the length direction of the pole piece material roll. The invention further discloses a pole piece coating drying method. According to the device and the method, uniform drying can be achieved on the whole assembly line, the drying forming efficiency of a pole piece coating is high, and the quality is good.