138 results about "Beam diameter" patented technology

The invention relates to the technical field of optical particulate matter sensing, in particular to a particulate matter particle size recognition and concentration detection method. The method comprises the following steps: laser emitted by a laser forms a laser beam which is focused and then diverged through a lens; with a laser focus as a reference, at least two photosensitive devices are distributed in the light beam propagation direction and comprise a perifocus device and a far focus device, and receiving surfaces of the near focus device and the far focus device face laser beams to collect scattered light; scattered light signals of each device are collected, and are input into a processing unit after independent current / voltage conversion, signal amplification and analog-to-digital conversion; based on the characteristics that small-particle-size scattered light is preferentially captured by perifocus high irradiance and large-particle-size scattered light is preferentially captured by far focus large beam diameter, a mapping relation between particle sizes and channels is established; the number concentration and mass concentration coefficient of each channel is calibrated through standard particles, and synchronous detection of PM1.0, PM2.5 and PM10 is realized in combination with linear processing, so that the particle size recognition precision and the concentration measurement reliability are effectively improved.

The invention discloses an intelligent sensing system for monitoring the quality of a cold end of a float glass production line, and relates to the technical field of glass production. The device comprises a top displacement beam and a bottom displacement beam which are respectively provided with an image sensor and a reflective mirror assembly, and synchronous detection of glass thickness and internal stress is realized in cooperation with a monitoring medium generation unit capable of adjusting the beam diameter. The thickness is calculated by using the refraction offset after the light beam passes through the glass, stress fringes are generated through the double-polaroid structure, and stress monitoring is realized in combination with an image sensor. The screw rod and the transmission belt driving device realize synchronous closed-loop control under the feedback of the grating ruler, so that the light path and the sensor reciprocate in the width direction of the glass, and real-time scanning of the whole glass is completed. The diameter of the light beam can be adjusted to consider accurate thickness measurement and stress fringe imaging, and the system has the advantages of high precision, full coverage, real-time performance and high automation degree, and is suitable for intelligent detection of the quality of the cold end of the float glass.

The invention belongs to the field of optics, and particularly discloses a light spot shrinking device for an angle resolution scatterometer. Through the first lens, the beam shaping element and the second lens which are sequentially arranged along the light path, beam focusing, beam shaping and collimation are carried out in sequence, the collimated beam with the diameter smaller than that of the beam of the light source is formed, the collimated beam is combined with the subsequent light path, and the light spot shrinking function can be achieved at the detection end of the objective lens.

The invention provides a planar distribution multi-beam electron gun, and relates to the technical field of microwave electric vacuum, and the planar distribution multi-beam electron gun comprises a housing; the cathode assembly is arranged in the shell, the cathode assembly comprises a cathode head, the surface of the cathode head is provided with a plurality of emitting surfaces which are arranged in a common plane in parallel at intervals, and the emitting surfaces are configured to escape electrons after being heated; the anode is arranged in the shell, and an electric field is formed between the anode and the emitting surfaces so as to accelerate escaped electrons, so that a plurality of electron beams are formed; the focusing electrode is arranged between the cathode head and the anode, an opening is formed in the focusing electrode, a plurality of grid wires are arranged on the opening, a grid gap between every two adjacent grid wires is aligned with the multiple emission surfaces in the emission direction of the electron beams, and the multiple grid wires are constructed to control beam diameters and divergence angles of the multiple electron beams; each electron beam passes through the gate slot aligned with the emission surface on which the electron beam is formed and enters the anode.

The invention discloses a non-full-length beam steel bar material breaking optimization method based on a hybrid optimization algorithm, and aims to solve the problem that an existing non-full-length beam steel bar material breaking method cannot balance the steel bar utilization rate and the calculation efficiency. The method comprises the following steps: for required beam steel bars under the same beam steel bar diameter, dividing the required beam steel bars into two groups according to the length of the beam steel bars; for required beam steel bars with the length larger than 12 m, a cut excess material splicing method is adopted, an optimized mathematical model of steel bar excess materials is established, and the number of used raw material steel bars and the division length of the raw material steel bars are calculated and determined through a genetic algorithm; and for required beam steel bars with the length smaller than 12 m, directly cutting from a single raw material steel bar or combining and processing the raw material steel bars with different specifications, listing all cutting modes, calculating steel bar excess materials corresponding to the cutting modes, and minimizing the total steel bar excess materials by the integer linear programming model to obtain a steel bar broken material combination scheme.

The invention discloses a 3D printing system capable of dynamically focusing and adaptively adjusting the spot size, and belongs to the field of 3D printing, the 3D printing system comprises a light source, a focusing lens, a focusing lens, a reflecting mirror and a printing working face which are arranged in sequence, the focusing lens moves front and back in the laser propagation direction and is used for calibrating the focal length at any time, the focusing lens is fixed, and the reflecting mirror is used for reflecting the spot size. The laser emitted by the light source is divergent laser, and an aperture diaphragm is arranged on the focusing lens and used for enabling the change proportion of the working distance to be the same as the change proportion of the beam diameter D when the focusing lens moves back and forth. In the process that the reflection galvanometer changes the laser inclination angle and focuses, the size of a light spot on a printing working face does not change, the magnification and the focal length of the whole system do not need to be adjusted through a compensation algorithm, and the system program is simplified.

The invention discloses a double-flat-topped light beam diamond polishing device and method based on homogenized optical fibers, and relates to the technical field of semiconductor material laser processing. The light spot homogenizing unit homogenizes the pulse laser to obtain a square flat-topped light spot; the light spot shaping unit collimates the homogenized pulse laser into parallel light and adjusts the beam diameter; the beam splitting and sub-transfer unit splits the parallel light into two sub-light beams, the two sub-light beams are adjusted to be coplanar and parallel to each other, and the center-to-center distance between the two sub-light beams is adjustable; the laser processing head unit focuses the two sub-light beams on the surface of the diamond; and the three-dimensional motion platform is used for bearing the diamond and scanning and polishing the diamond. Multi-focus array parallel scanning increases the coverage area of single-time processing, the processing effect of traditional single-focus multi-time scanning can be achieved through one-time scanning, the scanning frequency is remarkably reduced, the processing time consumption is reduced, and the processing efficiency is improved.

The invention relates to the technical field of femtosecond laser application, in particular to a femtosecond laser micro-nano machining device based on dynamic focusing, which comprises a machining table used for mounting an object to be machined and a driving mechanism moving according to a machining track, and a laser used for generating femtosecond laser pulses is arranged above the machining table. A rotating module and a beam shrinking mechanism are sequentially arranged in the irradiation direction of the femtosecond laser pulse; the rotating module comprises a first light path system for irradiating according to a processing track and a second light path system for forming detection irradiation on an object to be processed; the beam shrinking mechanism is used for adjusting the beam diameter and forming polarized light in different polarization states; the CCD camera is used for acquiring real-time image data; the control module is used for adjusting the power of the beam shrinking mechanism and the laser based on the real-time image; the method is used for automatically adjusting the control parameters according to the machining track control requirement in the complex machining task, and the machining precision is guaranteed.

The present invention relates to a method and to a device for correcting the shape of an optical component (1) using pulsed laser radiation. For this purpose, the component (1) is measured and excess material (7) is determined by way of comparison with a target geometry (6) and is at least partially removed by machining using at least one pulsed laser beam (4) with pulse durations of > 1 μs in order to at least approximate the actual geometry (5) to the target geometry (6). During machining, the component (1) is rotated at a rotational speed about an axis of rotation, wherein the distance of the laser beam (4) to the axis of rotation is changed at least temporarily. The rotational speed, the beam diameter of the laser beam (4) on the component (1) and the temporal pulse interval between the pulses of the laser beam (4) are selected such that material regions of the component (1) removed by successive pulses of the laser beam (4) do not overlap.

To reduce clipping and loss of brightness of a projected image.SOLUTION: There is provided a laser projection system (200), where light output by an optical engine is directed to a first scan mirror (206) as two angularly separated laser light beams (1002 and 1102). The angularly separated laser light beams typically have different angles of incidence (1010 and 1110) on a second scan mirror (208) of an optical scanner. Respectively different levels of magnification are applied to a beam diameter of each of the angularly separated laser light beams in a first dimension, such that the angularly separated laser light beams have respectively different beam diameters (1012 and 1112) upon incidence at the second scan mirror. The different beam diameters of the angularly separated laser light beams result in regions of incidence of each of the angularly separated laser light beams on the second scan mirror being equal or substantially similar.SELECTED DRAWING: Figure 1

The present invention discloses a distortion correction system and method for a laser self-spatial five-axis galvanometer, which includes an offset module, a beam expansion module, a scanning module and a focusing module; each module is sequentially installed inside the device at a certain distance, and the movement of the optical lens is used to focus the end laser beam on the working plane of the workbench to realize the movement in the five-dimensional space, that is, to realize the scanning in the X and Y dimensions, the movement of the focus in the Z dimension, and the deflection in the α and β dimensions; the offset module is used to realize the beam deviating from the optical axis by a certain distance in the X and Y dimensions; the beam expansion module is used to expand the beam diameter; the scanning module realizes the scanning of the beam in the XY plane; the focusing module is used to focus the beam and ensure that the inclination angle of the focused beam is small enough. The present invention adopts indirect correction of the processed pattern, designs different correction patterns for different dimensions of the beam movement, is convenient to operate and has low cost.

The application discloses an atmospheric turbulence simulator, which comprises a light source, a target, a first lens unit, a light splitting unit, a spatial light modulator, a first diaphragm unit, a second lens unit and a detector. The light beam generated by the light source passes through the target, becomes a parallel light beam through the first lens unit, is transmitted through the light splitting unit again, is reflected by the spatial light modulator and the light splitting unit again, enters the first diaphragm unit to be limited in diameter, is changed into an image square telecentric light beam through the second lens unit, is focused on the detector to form an image, and the detection of the target in different atmospheric turbulence environments is realized. The atmospheric turbulence simulator provided by the application has robustness, can realize the change of atmospheric conditions and the change of propagation distance, and thus makes the system device more flexible and practical.

The invention provides an optimization method and system for measuring the beam diameter of a solid laser through a trepanning method, and belongs to the technical field of applied optics. A trepanning method for measuring the beam diameter of a solid laser is optimized, a light splitting type attenuator is selected, a second energy meter (or a second power meter) is added, and fluctuation change of output energy (or power) of the measured laser is monitored; diaphragms of various specifications are used for measurement, and least square fitting is carried out on test data to obtain the beam diameter.

The invention discloses a rapid photocurrent imaging test device, system and method. The device comprises a beam expander (2), a galvanometer (3), a field lens (4), a data collector (6), a synchronizing signal generator (7) and a controller (8). Wherein the beam expander (2) is used for expanding the diameter of a laser beam emitted by the laser light source (1), so that the laser beam is focused through the field lens (4) to obtain a light spot with a smaller diameter; the synchronizing signal generator (7) is used for receiving a control signal of the controller (8) and generating a synchronizing signal for controlling the movement of the galvanometer (3) and data acquisition; the galvanometer (3) is used for controlling the rotating angle of the reflecting mirror according to the synchronizing signal and adjusting the emitting direction of the laser beam; the field lens (4) is used for focusing and coupling the laser beam to obtain a laser spot with a smaller focus diameter; and the data collector (6) is used for collecting light current / light voltage signals of the to-be-detected sample according to the synchronizing signal. According to the invention, the problems that the moving speed is low, the required time is long and the occupied area of the testing device and system is greatly reduced when the sample to be tested is moved by using an electric control moving table can be solved.

The invention discloses a femtosecond laser manufacturing system and method capable of dynamically regulating and controlling a numerical aperture, and belongs to the technical field of femtosecond laser precision machining. The system comprises a femtosecond laser, a power adjusting unit, a beam expander, an aperture tunable diaphragm, a 4F imaging system, a scanning galvanometer and an objective lens which are sequentially arranged along a light path, by adjusting the clear aperture of the diaphragm, the beam diameter at the entrance pupil of the objective lens is changed in real time, so that the equivalent numerical aperture of the system is dynamically regulated and controlled. In the machining process, according to the feature size precision requirements of different areas in a three-dimensional model, the three-dimensional model is divided into high-precision machining areas, medium-precision machining areas and low-precision machining areas, different equivalent numerical aperture modes and laser parameters are matched, the diaphragm is adjusted in a linkage mode in the scanning process, and switching between the high-resolution finish machining mode and the long-focal-depth efficient machining mode is achieved. The contradiction between the machining efficiency and the resolution ratio is solved, the precision is ensured, meanwhile, the overall machining efficiency is improved by several times to dozens of times, and three-dimensional cross-scale rapid forming is achieved.

Methods of additively manufacturing a three-dimensional object include irradiating a first build plane region using a first energy beam defining a beam diameter, the first energy beam travelling along a first oscillating path in a first direction to consolidate a first wall defining a thickness perpendicular to the first direction, wherein a build material adjacent a first side of the first wall and the build material adjacent a second side of the first wall, opposite the first side of the first wall, remains unconsolidated; and wherein the thickness of the first wall is greater than the beam diameter.

This invention relates to a linear scanning photopolymerization 3D printer, comprising: a single convex lens disposed on one side of a laser emitter capable of generating laser light; a beam modulator disposed on one side of the single convex lens; and a biconcave lens disposed on one side of the beam modulator. The invention utilizes an electric push rod to drive a first sliding part to move a second sliding part, which in turn moves the single convex lens and the beam modulator to a designated position in a two-stage linkage adjustment. This allows the single convex lens to expand the output laser beam once when it approaches the beam modulator, and to expand the laser beam a second time when the beam modulator approaches the diameter-changing part. Within a certain travel range, the beam diameter is expanded to the maximum extent possible. This results in a relatively short printing time for large-volume printing with fewer features, improving printing efficiency and functionality.

The invention provides a water cutting water flow converging jet adjusting method and system, and the method comprises the steps: carrying out the image collection and recognition of a water cutting process of a target object, obtaining the water cutting action information and water cutting trace information of the surface of the target object, and judging whether the target object is in a stable water cutting state or not based on the water cutting action information; on the basis of water cutting trace information, cutting deviation information of water flow sprayed by a spray head on the surface of the target object is determined, so that the collection adjustment target direction and the collection adjustment target size of the water flow sprayed by the spray head are determined, and the position form deviation of the water flow in the cutting process is taken as the reference; determining a converging adjustment target direction and a converging adjustment target size of the water flow sprayed by the spray head; and then the mixing state of the abrasive in the water flow jetted by the spray head and the flowing state of the airflow applied to the water flow jetted by the spray head are adjusted based on the target size and the target direction of the convergent adjustment, and it is guaranteed that the high-pressure water flow is accurately subjected to water cutting with the small beam diameter all the time.

A laser device (100) comprises: a seed light source that outputs pulsed laser light and is capable of controlling the repetition frequency of the pulsed laser light; an amplifier that amplifies and emits the pulsed laser light; a mask (50) that shapes at least one of the beam diameter and beam shape of the pulsed laser light emitted from the amplifier; an optical switching element (30) that is disposed on an optical path between the amplifier and the mask (50), and modulates transmittance such that fluctuations over time of at least one of the output and energy of the pulsed laser light emitted from the amplifier, which occur due to a change in the repetition frequency of the pulsed laser light, are within a predetermined range; and a beam propagation adjustment unit (40) that is disposed on the optical path between the amplifier and the mask (50), and adjusts the propagation of a beam of the pulsed laser light emitted from the amplifier.

To suppress an influence of radiation of feed light subjected to spatial transmission, an optical power feeding system 1B performs power feeding from PSE 110B to a PD 310B by spatial transmission of feed light 112. The PSE 110B includes a light emitter 111 and an adjuster 150B. The light emitter 111 outputs the feed light 112. The adjuster 150B variably adjusts a beam diameter of the feed light 112. The PD 310B includes a light receiver 311 and a responder 350B. The light receiver 311 converts the feed light 112 that has been received into electric power. The responder 350B makes a response to the PSE 110B in accordance with whether the beam diameter of the feed light 112 is appropriate. The adjuster 150B gradually decreases the beam diameter from a beam diameter at a start of outputting of the feed light 112, and stops decreasing the beam diameter, based on the response.

A re-configurable repeater device—such as a large intelligent surface or an amplify-and-forward repeater—includes an array of reflective elements and a beam-shaping unit in front of the array. The beam-shaping unit is configured to increase a beam diameter of an incoming beam. For instance, the divergence of incoming electromagnetic waves can be increased. It would be possible that the beam-shaping unit is im-plemented as a lens, e.g., a Luneberger-type lens.

The present application provides a laser processing device capable of changing the beam diameter of a laser beam without stopping the device during laser processing. A beam adjusting unit of the laser processing device that adjusts the beam diameter of the laser beam includes: a first lens unit and a second lens unit that are movable along the optical path of the laser beam; and a first moving mechanism and a second moving mechanism that move the first lens unit and the second lens unit along the optical path, respectively. A control unit includes a storage section that stores in advance the beam diameter of the laser beam and the positions of the first lens unit and the second lens unit corresponding to the beam diameter, and causes the first moving mechanism and the second moving mechanism to act to move the first lens unit and the second lens unit to the positions corresponding to the prescribed beam diameter.

The invention discloses an optical element multi-dimensional parameter single exposure measuring device and measuring method, and relates to the technical field of multi-parameter measurement, the device comprises an illumination system, a polarizer, a sample to be measured, a lens, a modulation plate, a data acquisition system and a data processing system; the illumination system is composed of a coherent light source and a collimation system and provides a beam of coherent illumination light with the diameter of about 5 mm for the system. The polarizer is arranged behind the illumination system and is used for converting the light beam into illumination light in a specific polarization state; through optical path design and a data processing algorithm, accurate measurement of multi-dimensional parameters such as the amplitude, the phase and the birefringence of the optical element can be completed through single exposure, the measurement time is greatly shortened, the measurement process which possibly needs several hours and even longer time originally is compressed to be instantly completed through single exposure, and the measurement efficiency is greatly improved. And the measurement efficiency is greatly improved.

The invention discloses a femtosecond laser operation flat-topped beam shaping optical system which comprises a laser, a beam expander, a DOE shaping module and a focusing scanning module. The laser is used for outputting a femtosecond Gaussian laser beam, and the femtosecond Gaussian laser beam sequentially passes through the beam expander, the DOE shaping module and the focusing scanning module and then acts on an operation area; the beam expander is used for expanding the diameter of the femtosecond Gaussian laser beam to the beam diameter used for cutting the light path; the DOE shaping module comprises a DOE diffractive optical element; the DOE diffractive optical element is arranged on a path of the femtosecond Gaussian laser beam and is used for converting an incident Gaussian beam into a flat-topped beam with uniformly distributed energy through phase modulation; the flat-topped light beam has no local energy peak value, thermal damage and excessive ionization of traditional Gaussian laser to normal tissues of eyes are avoided, postoperative inflammatory response is light, the tissue recovery speed is increased, and the risk of operative complications is reduced.

The invention discloses a multi-channel optical engine with a customizable optical spacing. The multi-channel optical engine comprises collimated light used for emitting collimated parallel light beams; the Z-BLOCK multiplexer / demultiplexer is located at the downstream of a light path of the collimated light and is used for processing the incident collimated parallel light and outputting four collimated light beams with different wavelengths; the converging lens or the lens array is located at the downstream of the light path of the Z-BLOCK multiplexer / demultiplexer and is used for converging and shaping the beam diameters of the four collimated lights; the planar optical waveguide chip is located at the downstream of an optical path of the converging lens or the lens array and is used for receiving the shaped four light beams and accurately controlling the distance between the input light beams through an optical waveguide by virtue of a waveguide structure of the planar optical waveguide chip; and the output light array is output from the planar optical waveguide chip to form a four-channel parallel light array with target spacing. The invention further discloses application of the multi-channel optical engine capable of being customized according to the optical distance to an optical module. According to the invention, the defect that the space micro-optics optical engine output light beam spacing is fixed and cannot be customized and adjusted in the prior art is overcome.

The invention provides a control device capable of improving the accuracy of defect detection. [Solution] The control device 7 controls an ultrasonic inspection device 100 that ultrasonically inspects an object to be inspected 5 by irradiating it with ultrasonic waves and receiving reflected waves, and includes an acquisition unit 71 that acquires a first reflected signal received from a first ultrasonic irradiation position on the object to be inspected 5 and a second reflected signal received from a second ultrasonic irradiation position on the object to be inspected, the distance between the second irradiation position and the first irradiation position being shorter than the beam diameter of the ultrasonic waves on the surface of the object to be inspected 5, and an integration unit 72 that integrates the first reflected signal and the second reflected signal to generate an integrated reflected signal.

The invention provides a multi-point beam flexible coverage planning method. The method comprises the following steps: acquiring satellite longitude and latitude, a user number, a demand matrix, a beam width array and a number upper limit; converting the longitude and latitude of the user into uv coordinates and generating a coverage area; the beam width is traversed, the corresponding uv beam diameter is calculated, a coverage area is gridded to generate candidate beams, and an optimal combination is selected through a first round of optimization after no-user beams are removed; screening the optimal beam width and reprocessing the optimal beam width; multiple groups of non-dominated combinations are selected through a second round of multi-objective optimization; and visualizing a plurality of groups of non-dominated combinations and then selecting a final scheme. Therefore, automatic beam arrangement is realized, manpower is saved, the period is shortened, fine requirements are adapted, the capacity utilization rate is improved, multiple schemes can be generated for selection, and feasibility is ensured.

A method of additive manufacturing a three-dimensional object includes irradiating a first build plane area with a first energy beam defining a beam diameter, the first energy beam traveling along a first oscillating path in a first direction to consolidate a first wall defining a thickness perpendicular to the first direction, wherein build material adjacent a first side of the first wall and build material adjacent a second side of the first wall remain unconsolidated, the second side of the first wall being opposite the first side of the first wall; and wherein the thickness of the first wall is greater than the beam diameter.

The invention discloses a highway pavement rut depth nondestructive testing and data analysis device, which comprises a basic detection module, a data analysis module and a data analysis module, wherein the basic detection module is used for measuring the vertical distance of a pavement in a non-contact manner by adopting a multi-laser array, generating a deformation track through cubic spline interpolation, calculating the rut depth and outputting original data; the dynamic environment self-adaptive acquisition module is used for integrating an illuminance sensor and a dust sensor, dynamically adjusting laser power, pulse interval and beam diameter, ensuring that the signal-to-noise ratio is greater than 30dB, and outputting an optimized measurement value; the mobile multi-dimensional scanning module is used for carrying a double-axis platform and realizing autonomous navigation through an SLAM algorithm, receiving optimization data and outputting multi-dimensional morphology data such as rut depth and transverse and longitudinal gradients; the field data grading processing module is used for realizing data cleaning through dynamic threshold rejection, moving average filtering and spatial verification; and the data analysis and prediction module is used for predicting the rut development trend based on an LSTM model in combination with historical data and supporting a preventive maintenance decision.

To make high visibility and high-speed printing compatible with each other without increasing the size and cost of an apparatus and shortening the life of the apparatus.SOLUTION: The printer can print an arbitrary pattern by irradiating a surface to be printed of a printing object with a laser beam, and includes a laser beam generation part for oscillating the laser beam, a laser beam diameter adjustment part for adjusting the beam diameter of the laser beam of a predetermined wavelength oscillated from the laser beam generation part, and a control part for controlling the laser beam diameter by the polarization of the laser beam whose laser beam diameter is adjusted by the laser beam diameter adjustment part. A laser light branching unit that performs transmission and reflection, a laser light scanning unit that two dimensionally scans the laser light transmitted through the laser light branching unit, a laser light irradiation unit that irradiates a printing target with the laser light scanned by the laser light scanning unit, a laser light measurement unit that measures reflected light from the printing target, and a focus control unit that controls a laser light diameter adjustment unit by the laser light measurement unit, the focus control part controls a focus position of the laser beam emitted to the printing object by the laser beam irradiation part based on the shape of the laser beam of the reflected light measured by the laser beam measurement part.SELECTED DRAWING: Figure 1