68results about How to "Improve distortion" patented technology

The invention discloses an industrial lens with a large target surface, low distortion and low chromatic aberration. An optical system of the industrial lens is composed of a meniscus positive lens L1, a meniscus negative lens L2, a biconcave negative lens L3, a positive lens L4, a diaphragm C, a positive lens L5, a biconvex positive lens L6, a biconcave negative lens L7, a biconvex positive lens L8, a biconvex positive lens L9, a biconcave negative lens L10, a biconvex positive lens L11 and an image plane IMG which are sequentially arranged along an incident light path, and the object side face of the meniscus positive lens L1 is a convex face; the object side surface of the meniscus negative lens L2 is a convex surface; the biconvex positive lens L6 and the biconcave negative lens L7 form a first gluing group; and the biconvex positive lens L9 and the biconcave negative lens L10 form a second gluing group. The industrial lens has the advantages of small size, large target surface, low distortion, low chromatic aberration and high resolution.

The invention relates to the technical field of thrust bearings, in particular to a preparation method of a tin-based babbitt metal bushing and the tin-based babbitt metal bushing. The preparation method of the tin-based babbitt metal bushing comprises the following steps that a transition layer containing tin is arranged on the surface of a thrust pad, plate-strip-shaped tin-based babbitt metal is arranged on the transition layer, pressure and ultrasonic waves are applied to the surface of the plate-strip-shaped tin-based babbitt metal, and welding is completed through ultrasonic pressure welding. According to the method, the tin-containing transition layer is arranged on the surface of the thrust pad, the thrust pad bushing is rapidly prepared through ultrasonic pressure welding, and element diffusion and hydrogen element escape among the bushing, the transition layer and the steel backing and atomic lattice distortion and electron movement between the babbitt metal bushing and the transition layer are promoted through the coupling effect of extrusion force and high-frequency vibration; the plate-strip-shaped tin-based babbitt metal is welded to the surface of the thrust pad to form the bushing, the prepared babbitt metal bushing coating is uniform and compact, the preparation technology is greatly simplified, and environment friendliness is achieved.

The invention provides an airborne glacier detection radar system and an imaging processing method, and belongs to the technical field of radar information acquisition. The airborne glacier detection radar system consists of a fully polarized antenna unit, a power amplifier unit, a host control unit, a storage unit, an inertial navigation unit, a power supply unit and an upper computer monitoring unit, and is used for transmitting and receiving electromagnetic wave signals through an antenna to carry out perspective detection on a glacier; echo signals of the atmosphere and the glacier surface layer, the glacier internal structure and the glacier bottom layer and bed rock are obtained, and the glacier perspective detection capability is achieved. An airborne glacier detection radar is integrated on an aircraft platform, and one-dimensional section information of a glacier is obtained through airborne motion. Wherein the vertical resolution of the very high frequency airborne glacier detection radar is superior to 2 meters, and the glacier detection depth is superior to 100 meters. According to the invention, a new technical means is provided for the airborne glacier detection system in the application research aspects of polar glacier reserve estimation, ice layer thickness measurement, glacier fine structure and under-ice landform detection and the like.

The invention relates to the technical field of motor control, and discloses a motor dead zone compensation method and device, a vehicle and a storage medium, and the method comprises the steps: obtaining the actual phase current of each phase of a target motor and the corresponding instruction current; selecting a target instruction current corresponding to each phase from the actual phase current of each phase and the corresponding instruction current based on the magnitude relationship between the actual phase current of each phase and a preset phase current selection threshold value; determining a compensation duty ratio value of each phase based on the current rotating speed of the target motor and the target instruction current corresponding to each phase; and compensating the current phase voltage instruction of the corresponding phase of the target motor based on the target instruction current and the compensation duty ratio value corresponding to each phase. According to the method, the current zero crossing point moment is judged in a mode of reasonably selecting the target instruction current according to the actual phase current, so that the dead zone compensation moment is more accurate and efficient, accurate dead zone compensation is realized, phase current distortion is improved, and torque fluctuation is reduced.

The invention discloses an automatic focusing and distortion optimization method based on a large-target-surface industrial lens, relates to the technical field of lens distortion optimization, and aims to accurately identify different distortion types and provide accurate data for subsequent optimization and adjustment by comprehensively analyzing the distortion of the lens from multiple dimensions (radial, tangential and comet distortion). Through calculation of a comet distortion coefficient HJ obtained by calculating a detailed radial distortion coefficient # imgabs0 #, a first tangential distortion coefficient # imgabs1 # on an x axis and a second tangential distortion coefficient # imgabs2 # on a y axis in combination with S44, various distortion conditions (radial, tangential and comet distortion) of the lens can be quantified, and the total distortion rate D is calculated; the distance between the front focusing group A and the rear fixed lens group B of the lens is evaluated and corrected, and the imaging quality of the lens is improved through step-by-step correction (including focal length, distortion, brightness attenuation and the like) in each step from S2-S5.

The invention relates to a super-surface-based flat plate type super-integrated miniature spectral imaging system, which comprises a gold reflecting layer and a flat plate substrate reflecting layer integrated with a dispersion super-surface, a first focusing reflection super-surface, a second focusing reflection super-surface and a focusing transmission super-surface, incident light is split by the dispersion metasurface, then is reflected to the gold reflection layer, and then is sequentially focused by the two reflection metasurfaces and the transmission metasurface to be imaged on an image plane. The dispersion metasurface adopts a periodically arranged square nano-column diffraction grating structure and has stronger dispersion capability, and the other three metasurface elements are obtained by adopting phase optimization design, so that the imaging performance is excellent; the four metasurfaces are integrated on the same reflecting layer, system optics is only composed of two flat reflecting layers, wavefront regulation and control are achieved while light in a reflecting cavity is continuously reflected, the metasurface can be manufactured through the single photoetching technology, the structure is simple and compact, machining, assembling and adjusting are easy, and a new product is provided for a high-performance compact imaging spectrometer.

The invention discloses an uncertainty perception single-image super-resolution network model based on self-convolution attention. The model comprises a shallow feature extraction module SFE, a deep feature extraction module DFE and an image reconstruction module IR. The shallow feature extraction module SFE performs shallow feature extraction on an input low-resolution image through a convolutional layer to generate an initial feature F0: the deep feature extraction module DFE comprises a plurality of residual attention groups RAG, and each residual attention group RAG is composed of a plurality of cross-resolution mixed attention blocks CRHAB; the deep feature extraction module DFE is used for extracting a deep feature FDF from the initial feature F0, and the image reconstruction module IR is used for up-sampling the deep feature FDF and combining the deep feature FDF with the initial feature F0 to generate a final super-resolution output image ISRS.

The present invention relates to the field of optical imaging technology, and discloses a microscope phase contrast objective lens, comprising a first lens group with positive refractive power, a second lens group with positive refractive power, an object plane and a cover glass, wherein the first lens group is located below the second lens group, and the absolute value of the refractive power of the first lens group is greater than the absolute value of the refractive power of the second lens group. The present invention is arranged by setting the first lens group and the second lens group in the phase contrast objective optical system, and by limiting the focal length, refractive index, Abbe number and thickness of the first lens group and the second lens group, so that the field curvature, distortion and aberration sensitivity of the phase contrast objective optical system are further improved, thereby ensuring the optical performance of the phase contrast objective optical system, so that the objective optical system has the characteristics of small magnification, large numerical aperture, high resolution performance, small chromatic aberration under a large field of view, small number of lenses, and short total length of the objective optical system.

The utility model provides a hydrostatic bearing assembly for a two-axis vibration test bench and the two-axis vibration test bench, the hydrostatic bearing assembly is arranged between a workbench and a horizontal table top, the hydrostatic bearing assembly comprises an x-direction slide block, a y-direction slide block and a base, the base and the y-direction sliding block are in sliding connection through a dovetail sliding rail extending in the y direction and a dovetail groove, the x-direction sliding block and the y-direction sliding block are in sliding connection through a dovetail sliding rail extending in the x direction and a dovetail groove, a static pressure oil film is formed on the contact face of the base and the y-direction sliding block, and a static pressure oil film is formed on the contact face of the x-direction sliding block and the y-direction sliding block. According to the structure, the hydrostatic bearing assembly with the dovetail sliding rails matched with the dovetail grooves is adopted, decoupling of movement in the x direction and the y direction is achieved, the using upper limit frequency of the vibration test bed is improved, the distortion degree of the horizontal table top is improved, and the anti-overturning moment capacity of the horizontal table top is enhanced.

The present invention discloses a medical endoscope lens, comprising a first lens, a second lens, an aperture and a third lens arranged in sequence along an optical axis from the object side to the image side, the first lens to the third lens each comprising an object side surface facing the object side and allowing imaging light to pass through and an image side surface facing the image side and allowing imaging light to pass through, the first lens has positive refractive power, and the object side surface of the first lens is concave, and the image side surface is convex, the second lens has negative refractive power, and the object side surface of the second lens is convex, and the image side surface is concave, the third lens has positive refractive power, and the object side surface of the third lens is convex, and the image side surface is convex. The medical endoscope lens of the present invention is small in size and easy to use, and at the same time has good color reproduction, small distortion, high resolution, good imaging quality, and has a large magnification, and can also clearly observe some smaller lesion areas.

The present invention relates to an eyepiece optical system, an electronic viewfinder and an image pickup device, wherein light is imaged through the eyepiece optical system, the direction toward the observer's eyes is the eye side, and the other side is the display side, and the eyepiece optical system is provided with a first lens group with negative refractive power and a second lens group with positive refractive power in sequence from the eye side to the display side; the first lens group is fixed, and the second lens group can move along the optical axis. The eyepiece optical system of the present invention has a strong positive refractive power and high optical performance. At the same time, by setting the first lens group as a fixed structure and the second lens group as movable along the optical axis, the structure is conducive to using more optical mirrors in a limited space, so that the eyepiece optical system improves the optical performance in the electronic viewfinder without increasing the space. Therefore, the electronic viewfinder equipped with the eyepiece optical system has the characteristics of small size while having a large viewing angle and high optical performance.

This invention discloses an intelligent exercise assessment and early warning system based on multi-source biosignal fusion, belonging to the field of exercise risk early warning technology. It collects multi-source data, including electromyography (EMG), heart rate, blood oxygen, skin conductance, and acceleration, from various wearable sensors to assess muscle fatigue, cardiovascular load, exercise status, and environmental factors. After preprocessing, the system uses quantitative models such as the muscle fatigue correction index and the cardiovascular load dynamic coefficient to calculate a comprehensive exercise risk early warning index by integrating physiological state and environmental factors. This results in a normalized risk classification, corresponding to low, medium, and high risk levels and marked with different color icons. This system overcomes the limitations of single signals, considering the synergistic effects of multi-dimensional physiological indicators and the influence of environmental factors, improving the accuracy of assessment in complex scenarios. It can effectively intervene before risks develop and is suitable for scenarios such as mass fitness and professional training. It is integrated into lightweight wearable devices without interfering with the exercise process.

The invention discloses a flexible methanol fuel cell and a humanoid robot power supply system, and relates to the technical field of methanol power generation, the flexible methanol fuel cell comprises a flexible bag body, the two ends of the flexible bag body are provided with a liquid inlet and a liquid outlet, and the side surface is provided with a mounting opening; the membrane electrode is sealed in the mounting opening; the anode diffusion layer and the cathode diffusion layer are respectively fixed on the anode side and the cathode side of the membrane electrode, and fine wire meshes are fixed on the anode diffusion layer and the cathode diffusion layer. A humanoid robot power supply system comprises a flexible methanol fuel cell, a DMFC energy management system and an energy storage cell, and the flexible methanol fuel cell serves as a power generation unit and is integrally distributed on the outer surface of a robot. According to the flexible methanol fuel cell disclosed by the invention, the whole cell body has good bending, twisting and tensile elasticity, can adapt to various irregular surfaces and dynamic deformation scenes, and is light in weight and thin in thickness. The flexible methanol fuel cell is used as a power generation skin to be integrated on the robot, the mass energy density is improved, and the endurance working time is prolonged.

The invention discloses a multi-format compatible space laser communication receiving device and method, belongs to the technical field of free space optical communication, and aims to solve the problems that an existing system is high in complexity and maintenance cost and poor in dynamic channel characteristic applicability in a space laser communication system. The C-band tunable laser is connected with the IQ modulator through an optical fiber, the IQ modulator is connected with the power amplifier, the power amplifier is connected with the transmitting antenna through an optical fiber, the transmitting antenna is in wireless transmission with the receiving antenna, the receiving antenna is connected with the optical fiber coupler through an optical fiber, and the optical fiber coupler is connected with the pre-amplifier and the optical power module through optical fibers. The preamplifier, the photoelectric detector and the analog-to-digital converter are sequentially connected through optical fibers, the analog-to-digital converter is connected with the FPGA through a radio frequency line, and the optical power module and the temperature pulsation instrument are respectively connected with the FPGA through USB data lines. The multi-format compatible receiving and the high rate are met, meanwhile, the requirement for system hardware is lowered, the cost is low, and the reliability is high.

The utility model relates to the technical field of spring machining, in particular to a spring machining steel wire twisting mechanism which comprises a bearing table and a vertical plate, a twisting mechanism is installed on the plate wall of the vertical plate, and the twisting mechanism is formed by combining a motor, a sleeve, a threaded rod, an arc clamping plate, a twisting rod, a fixing frame, an electric hydraulic rod, an extrusion block and a limiting block. A motor is installed on the plate wall of the vertical plate through bolts, a sleeve is installed at the output end of the motor, a set of symmetrical threaded rods are in threaded connection with the sleeve wall of the sleeve, one end of each threaded rod is connected with an arc clamping plate through a bearing, and a twisting rod is connected to the inner wall of the sleeve in an inserted mode. And a fixing frame is welded to the sleeve wall of the sleeve, so that after the twisting rod is located between the arc clamping plates, a worker rotates the threaded rod, the threaded rod pushes the arc clamping plates to clamp and fix the twisting rod, and therefore the springs with different diameters can be twisted conveniently.

The invention relates to a reflection compensation circuit of a controller, the controller, a method and equipment, and the method comprises the steps: carrying out the differential amplification of a communication bus signal of the controller through a differential amplifier module, generating a differential amplification signal, carrying out the gain amplification of the differential amplification signal through a variable gain amplification circuit module according to a control signal of the controller, and generating a reflection compensation signal; the feedback loop module generates a gain amplification signal according to a preset reference signal of the controller, so that the feedback loop module can output a feedback signal according to the difference between the gain amplification signal and the preset reference signal of the controller, so as to adjust the control signal based on the feedback signal until the signal value of the feedback signal is within the system preset value range of the controller. Therefore, the signal distortion can be reduced to the greatest extent, the problems of CAN signal distortion and noise interference are improved, the CAN communication quality is improved, and the problem of poor CAN communication quality in the prior art is solved.

The invention provides a composite nickel-based alloy microchannel and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing nickel-based alloy powder which comprises the following element components in percentage by mass: 15-20% of Cr, 16-20% of Mo, 0.5-1% of Mn, 2-3% of W and 54-62.5% of Ni for later use; s2, 2-3% of silicon powder is doped into the nickel-based alloy powder obtained in the S1, ball milling mixing is conducted, grinding balls are not added in the ball milling process, and nickel-based alloy composite powder is obtained for standby application; and S3, preheating is conducted, specifically, the nickel-based alloy composite powder obtained in S2 is prepared through 3D printing to obtain a target, annealing treatment is conducted at the temperature of 600-780 DEG C, furnace cooling is conducted, and the composite nickel-based alloy microchannel is obtained. The composite nickel-based alloy micro-channel prepared through the operation of element selection and independent doping of the silicon powder is excellent in 3D printing forming quality, free of cracks, high in density, few in air holes, high in density, good in corrosion resistance and good in forming quality, and the problems that in the prior art, materials are poor in corrosion resistance and poor in forming quality can be effectively solved.

The invention relates to a wear-resistant and corrosion-resistant iron-nickel alloy material and a preparation method thereof, and belongs to the technical field of alloy material preparation, and the preparation method specifically comprises the following steps: firstly, using Mo, Si and Cr to reinforce an iron-nickel alloy matrix, mixing and smelting, and pouring into a cast ingot; then, the cast ingot is subjected to quenching, tempering and homogenizing heat treatment, and a primary blank is prepared; and then, the surface of the primary blank is roughened and pre-oxidized, the primary blank is coated with a nano TiN and WC enhanced NiCrBSi material, and finally the wear-resistant and corrosion-resistant iron-nickel alloy material is obtained. According to the prepared alloy, the hardness, the strength, the wear resistance and the corrosion resistance are remarkably improved, due to the solid solution and the compound formed by the reinforcing elements and the compact coating structure reinforced by the nano-particles, wear and corrosion are effectively resisted, and the service life is prolonged.

The invention relates to the technical field of ultrasonic emission, and particularly provides an arbitrary waveform ultrasonic generation method for demodulating a pulse width modulation signal by using frequency response characteristics of a transducer. The method comprises the following steps: acquiring frequency response characteristic data of a target ultrasonic transducer; calculating a modulation function for modulating the duty ratio of the pulse width modulation signal; generating a high-voltage pulse width modulation signal sequence; directly driving the target ultrasonic transducer by the high-voltage pulse width modulation signal sequence, and filtering and demodulating the high-voltage pulse width modulation signal sequence by using the frequency response characteristic of a mechanical vibration system of the target ultrasonic transducer as a natural low-pass filter, and generating an ultrasonic wave corresponding to the target ultrasonic waveform. According to the invention, the fundamental simplification of the system structure is realized, high-fidelity arbitrary waveform ultrasonic output is obtained on the basis of keeping high-efficiency switch driving, and the system has excellent waveform flexibility and adaptive capacity to transducer characteristics.

An optical system disclosed in an embodiment of the present invention includes first to eighth lenses disposed along an optical axis in a direction from an object side to a sensor side, wherein: the first lens has a positive (+) refractive power on the optical axis and has a meniscus shape protruding toward the object side; an eighth lens having negative (-) refractive power on the optical axis and having a meniscus shape protruding toward the object side; an object-side surface of the seventh lens has a critical point; a sensor-side surface of the third lens has a critical point, and a sensor-side surface of the eighth lens has a critical point, and when an effective diameter of a sensor-side surface of the third lens is CAL3S2, an effective diameter of an object-side surface of the fourth lens is CAL4S1, a maximum thickness among center thicknesses of the first to eighth lenses is CTMax, a maximum gap among gaps between the first to eighth lenses is CGMax, and the effective diameter of the sensor-side surface of the third lens is CAL3S2. The following mathematical relationship is satisfied: 0.5 lt; cAL3S2 / CAL4S1lt, and CAL4S1lt; 1.5 and 0 lt; cTMaxt / CGMaxt, and CTMaxt / 1.

The invention relates to the technical field of electric field processing and freezing preservation, and discloses an electric field generator for improving the uniformity of a space electric field and an aquatic product freezing method.The electric field generator for improving the uniformity of the space electric field comprises an electric field generating structure which defines at least one working plane, a working area is formed between the two groups of electric field generating structures; the functional structures are symmetrically arranged on one of the electric field generating structures, and each functional structure is provided with a circuitous part which extends towards the working area; according to the electric field generator, by introducing a flat-curved composite structure design into the discharge plate, potential distribution is optimized, the uniformity of a space direct-current electric field is remarkably improved, the fringe electric field concentration effect is reduced, the electric field generator can form a stable and uniform potential field in the electric field auxiliary freezing process, uniform nucleation is promoted, ice crystals are refined, protein structure denaturation is reduced, and the freezing efficiency is improved. Therefore, the quality of frozen samples is improved.

An optical system disclosed in an embodiment of the present invention may include first to eighth lenses disposed along an optical axis from an object side to a sensor side, in which an object-side surface of the first lens is convex, and at least one of an object-side surface and a sensor-side surface of the seventh lens has at least one critical point, at least one of an object-side surface and a sensor-side surface of the eighth lens has a free-form surface shape in which lens surfaces in a first direction and a second direction orthogonal to each other with respect to the optical axis are asymmetrical, and in a free-form surface, lens surfaces in the first direction and the second direction are asymmetrical. The opposing lens surface has a symmetrical shape in a first direction with respect to the optical axis, and the opposing lens surface has a symmetrical shape in a second direction with respect to the optical axis.

The utility model relates to the technical field of near-to-eye display, and discloses an optical module and a head-mounted display device, the optical module is composed of a first optical element and a second optical element; the first side surface of the first optical element faces human eyes; the first side surface of the second optical element faces the second side surface of the first optical element, and the second side surface of the second optical element faces the display screen; the optical module satisfies the following conditions: 0 < = sin (theta1) / sin (theta2) < = 7; wherein theta1 is the maximum field-of-view principal ray incident angle of the first optical element, and theta2 is the maximum field-of-view principal ray emergent angle of the second optical element. According to the head-mounted display device, the refraction angle of the light between the lenses can be limited in a proper range while the size of the optical module is miniaturized, the imaging quality and the size of the optical module are well balanced, and the user experience is effectively improved while the miniaturization design requirement of the head-mounted display device is met.

This invention discloses a method for suppressing current imbalance and power oscillations based on a virtual synchronous generator (VSG). First, a traditional VSG loop model is established and its parameters are tuned. Then, the positive and negative sequence components of the grid-connected voltage, filter capacitor terminal voltage, and grid-connected current are extracted using a time-delay cancellation method and transformed to a synchronous rotating coordinate system. An equivalent VSG grid-connected loop model is added to the traditional VSG model. The traditional active power and extended reactive power calculation methods are transformed to the synchronous rotating coordinate system, and a reference value for the grid-connected current that suppresses the second harmonic component of the power is derived. A PI controller is used to make the actual grid-connected current track the reference value, and the output modulated wave drives the inverter. This invention can simultaneously suppress the second harmonic oscillations of active and reactive power, improve grid-connected current imbalance and distortion problems, while retaining the active power frequency regulation, reactive power voltage regulation, and inertial support characteristics of the VSG, thus improving the stability and power quality of the new energy grid-connected system.

The invention provides austenitic stainless steel as well as a preparation method and application thereof, and relates to the field of high-temperature-resistant austenitic stainless steel. The austenitic stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.10% of C, less than or equal to 0.12% of N, less than or equal to 2.0% of Si, 1.0-2.0% of Mn, 16.0-18.0% of Cr, 10.0-14.0% of Ni, 2.0-3.0% of Mo, 0.05-0.10% of Nb, 0.05-0.10% of Ti, less than or equal to 0.02% of S, 0.04-0.06% of P and the balance of Fe and inevitable residual elements. The content of P in the stainless steel is increased, the diffusion rate of solute atoms such as Cr and Mo can be reduced through interaction of P and vacancies at the high temperature, nucleation of M23C6 carbides and the like at the grain boundary is inhibited, the precipitation number is remarkably reduced, meanwhile, P is discharged outwards in the coarsening process of the M23C6 carbides, a core-shell result that the M23C6 carbides are wrapped by the P element is formed, the coarsening rate of the M23C6 carbides is reduced, and the corrosion resistance of the stainless steel is improved. Furthermore, a creep cavity caused by a precipitated phase in the creep process is inhibited, and the creep fracture strength is improved.

The invention relates to the technical field of alloy coatings, in particular to an in-situ TiC reinforced AlCoCrFeNiMo high-entropy alloy laser cladding coating and a preparation method thereof.The preparation method comprises the steps that S1, mixed metal powder, Ti powder, graphite powder and modified powder are added into a ball milling tank and subjected to ball milling under argon protection; s2, the surface of the base material is polished with abrasive paper, an interface bonding modifier is sprayed after ultrasonic cleaning, and a pretreated base material is obtained; and S3, cladding a coating on the surface of the base material by using DML2000 laser cladding equipment, and cooling to room temperature along with the furnace after cladding is completed. According to the method, through the in-situ reaction of Ti and C in the laser cladding process, a TiC reinforced phase is generated in an AlCoCrFeNiMo high-entropy alloy matrix, the problems of uneven distribution, poor interface bonding and the like caused by direct addition of TiC are avoided, and the bonding strength of the reinforced phase and the matrix is improved. And due to introduction of TiC, crystal grains are refined, lattice distortion is increased, and therefore the comprehensive performance of the coating is improved.

This invention proposes a gallium nitride-based semiconductor laser, comprising, from bottom to top, a substrate, a lower confinement layer, a lower waveguide layer, an active layer, an upper waveguide layer, and an upper confinement layer. This invention incorporates a multi-layered, multi-vacancy electron-phonon modulation layer within the semiconductor laser element, defining the electron affinity distribution and polarization optical phonon energy distribution characteristics of each multi-vacancy electron-phonon modulation layer. This forms single-vacancy, vacancy cluster, and multi-vacancy modulated electron-phonon structures, localizing electron-phonons between the lower confinement layer and the lower waveguide layer. This reduces the Stokes shift caused by the photon energy difference between the pump light and the oscillating light, reduces heat loss from phonon vibration and phonon transport, improves the heat dissipation of the laser element, mitigates interlayer thermal mismatch, suppresses the thermal lensing effect and stress birefringence effect of the laser, improves laser beam distortion and depolarization, and enhances the laser beam quality factor.

The invention provides an automatic forming production line for air valve blades, and belongs to the technical field of air pipe machining equipment. Comprising an unwinding frame, a leveling frame and a conveying roller frame which are sequentially arranged together, and a forming machine is arranged on one side of the conveying roller frame; a material guide mechanism, a leveling mechanism, a punching mechanism and a cutting mechanism are sequentially arranged on the leveling frame, and a plurality of groups of leveling rollers and a first servo motor for driving the leveling rollers to rotate are arranged on the leveling mechanism; a plurality of conveying rollers arranged in parallel are arranged at the top of the conveying roller frame, and a second servo motor capable of driving the conveying rollers to rotate synchronously is further fixed to the conveying roller frame; the production line further comprises two feeding mechanisms, one feeding mechanism is located in the conveying roller frame, the other feeding mechanism is located in the forming machine, and the two feeding mechanisms are matched to clamp the galvanized sheet and translate in the axis direction of the conveying rollers. The device has the advantages of labor saving, good product consistency, good smoothness and the like.

A multi-format compatible space laser communication receiving device and method belongs to the field of free space optical communication technology. In order to solve the problem of high complexity and high maintenance cost of the existing system, and facing the problem of poor applicability of dynamic channel characteristics in the space laser communication system, the signal source of the device is connected to the IQ modulator through a radio frequency line, the C-band tunable laser is connected to the IQ modulator through an optical fiber, the IQ modulator is connected to the power amplifier, the power amplifier is connected to the transmitting antenna through an optical fiber, the transmitting antenna and the receiving antenna are wirelessly transmitted, the receiving antenna is connected to the optical fiber coupler through an optical fiber, the optical fiber coupler is respectively connected to the preamplifier and the optical power module through an optical fiber, the preamplifier, the photodetector, and the analog-to-digital converter are connected in turn through optical fibers, the analog-to-digital converter and the FPGA are connected with an radio frequency line, and the optical power module and the temperature pulsator are respectively connected to the FPGA through a USB data line. While meeting the requirements of multi-format compatible reception and high speed, the requirements for system hardware are reduced, the cost is low and the reliability is high.

The invention belongs to the technical field of nanocrystalline hard alloy, and discloses tungsten carbide-based nanocrystalline hard alloy and a preparation method thereof. The preparation method comprises the following steps that tungsten carbide powder is put into a modified solution containing soluble cobalt salt and soluble lanthanide series metal salt to be soaked, solid matter is collected, washed and dried after soaking is completed, and first powder is obtained; calcining the first powder in a reducing atmosphere to obtain second powder; and mixing the second powder, high-entropy metal carbide powder or high-entropy metal carbonitride powder and boron carbide powder, and then forming and sintering to obtain the tungsten carbide-based nanocrystalline hard alloy. The comprehensive effect of lanthanide series metal, high-entropy metal carbide powder or high-entropy metal carbonitride powder and boron carbide is utilized, and a novel introduction mode is adopted, so that the granularity of tungsten carbide is effectively inhibited, the nanocrystalline hard alloy with excellent hardness, obdurability and high temperature resistance is successfully prepared, and the practicability is very high.