51results about How to "Low dispersion" patented technology

The invention discloses an unmanned aerial vehicle aerial image target detection method based on improved YOLOv8, and relates to the technical field of target detection, and the method comprises the steps: collecting image data of unmanned aerial vehicle aerial photography, inputting the image data into a backbone network of an improved YOLOv8 model, and extracting features; transmitting the feature map to a neck network for feature processing and fusion, and carrying out target classification and bounding box prediction in a head network by using a detection head specially aiming at a small target and a multi-scale feature map; and calculating the difference between a predicted bounding box and a real bounding box by using an MPDIOU loss function, updating model parameters in a back propagation manner, and outputting a detected target category and bounding box coordinates. According to the method, a C2f module is replaced by RepNCSPELAN4, a GAM attention mechanism is introduced, a small-scale feature detection head is added, an MPDIOU loss function is adopted, feature extraction and fusion are optimized, and the detection precision and bounding box regression accuracy are improved.

The invention discloses a cable laying risk assessment method and system based on optimal state closeness. The method comprises the following steps: acquiring multi-dimensional laying state evaluation index data of a plurality of cable laying devices in a cable laying process; based on the obtained evaluation index data, calculating subjective and objective weights of each evaluation index, and performing combined weighting of the subjective weights and the objective weights to obtain an optimal combined weight; calculating the optimal state close degree of each cable laying device based on the optimal combination weight; and performing grading evaluation on the cable laying risk according to the optimal state close degree. The cable laying risk can be effectively evaluated, and cable laying faults and accidents are prevented.

The invention discloses optical glass with high refractive index, low dispersion and relatively large negative short wave relative partial dispersion. The optical glass comprises the following components in percentage by weight: 3-15% of SiO2; 24 to 34 percent of B2O3; 1 to 12 percent of La2O3; 7 to 16 percent of Y2O3; 20 to 30 percent of ZnO; zrO2: 3 to 9 percent; and 1 to 6 percent of Nb2O5. Through reasonable component design, the optical glass is good in production performance, and the optical glass has relatively high refractive index, relatively low dispersion and relatively large negative special dispersion.

The invention relates to the field of glass coating production equipment, in particular to a spin coating device and method for glass coating, which comprises a control base, a machine cover is fixed above the control base, one side of the machine cover is provided with a vacuumizing pipe for vacuumizing the interior of the machine cover and an exhaust pipe for vacuumizing the interior of the machine cover, and the other side of the machine cover is provided with a vacuum pump for vacuumizing the interior of the machine cover. Through cooperation of the IR film coating mechanism, the AR film coating mechanism and the lnk spin coating mechanism, IR film coating is conducted on a wafer firstly, then AR face bottoming film coating is conducted, the light transmittance and imaging quality of a final product are further optimized, IR film coating is conducted on the wafer firstly, then AR face bottoming film coating is conducted, then lnk spin coating is conducted, and finally AR film coating is conducted. The optical performance can be improved, the film coating adhesive force can be enhanced, the technological process can be optimized, the product performance can be improved, the production efficiency can be improved, the cost can be reduced, the product reliability can be enhanced, and the probability of chromatic dispersion and high-temperature-resistant phenomena in the baking process can be reduced.

The invention discloses a wide-angle astronomical eyepiece, which comprises a diaphragm, a first lens group and a second lens group, and is characterized in that the first lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side; the second lens group sequentially comprises a seventh lens, an eighth lens, a ninth lens and a tenth lens from the object side to the image side; the first lens and the second lens, the fourth lens and the fifth lens, and the eighth lens and the ninth lens are respectively glued; the focal power of the first lens group is phi F, the focal length of the first lens is F1, the refractive index of the first lens is N1, the Abbe number of the first lens is V1, the focal length of the sixth lens is F6, and the following relational expressions are met: 0.42 lt; f1 / [phi] Flt; 0.65, 0.65; 1.70 lt, 1.70 lt; n1lt; 1.85, 1.85; 35 lt; v1lt; 65; 0.028 [mu] m; f < 6 > / [phi] F < lt >; and-0.021,-0.021. The wide-angle astronomical eyepiece can better control chromatic aberration, so that the chromatic dispersion phenomenon is reduced.

The invention discloses a flux limiter-based dynamic energy flow determination method for an electric heating comprehensive energy system. The method specifically comprises the following steps of: establishing a dynamic energy flow model of the electric heating comprehensive energy system; the thermal dynamic partial differential equation is differentiated by using a flux limiter format with the property that total variation is not increased; establishing a self-adaptive variable step size strategy; and constructing a dynamic energy flow calculation process of the electric heating comprehensive energy system, determining the dynamic energy flow of the electric heating comprehensive energy system, and alternately solving thermal, hydraulic and electric power equations so as to obtain a time sequence change track of thermal, hydraulic and electric power variables. According to the method, the partial differential equation is differentiated by using a flux limiter format with a total variation non-increasing property, so that dispersion and dissipation errors are effectively reduced, and the calculation accuracy is improved; and a self-adaptive step size control technology is used, so that the convergence of calculation is ensured, and the efficiency of dynamic energy flow calculation of the electric heating comprehensive energy system is improved.

The invention discloses optical glass, a glass prefabricated part, an optical element and an optical instrument, and relates to the technical field of optical glass. The optical glass comprises the following components in percentage by weight: 1-15% of SiO2; 5 to 25 percent of B2O3; the content of La2O3 is 35%-60%; 4 to 25 percent of Y2O3; zrO2: 2%-15%; 3 to 20 percent of Nb2O5; 0 to 10 percent of Gd2O3; 0 to 10 percent of TiO2; 0 to 5 percent of Ta2O5; 0-8% of RO; 0 to 8% of Rn2O; 0 to 5 percent of WO3; znO: 0 to 10%; 0 to 8 percent of Al2O3; 0 to 10 percent of Yb2O3; 0 to 5 percent of GeO2; 0-2% of a clarifying agent; the ratio of (Y2O3 + Nb2O5) / La2O3 is 0.2 to 1.0; rO is one or more of MgO, CaO, SrO and BaO; the Rn2O is one or more of Li2O, Na2O and K2O; and the clarifying agent is one or more of Sb2O3, SnO, SnO2 and CeO2. The optical glass provided by the invention has relatively high hardness and light transmittance.

The invention relates to the technical field of optical glass manufacturing, in particular to high-refractive-index glass as well as a preparation method and application thereof. The transition metal is less than 4 ppm by mass, and the transition metal comprises one or more of Fe, Cr, Ni, Cu, Mn, Co and V; the oxide is prepared from the following components in mole percent based on the oxide: 17 mol% to 49 mol% of Bi2O3, 2.7 mol% to 15.7 mol% of Nb2O5, 8.5 mol% to 39 mol% of TeO2, 2 mol% to 19.5 mol% of P2O5, 11.3 mol% to 41 mol% of B2O3, 0 mol% to 1 mol% of TiO2, 0 mol% to 1 mol% of Ta2O5, 0 mol% to 1 mol% of WO3 and 0.5 mol% to 16.5 mol% of ZnO, and Bi2O3 / (TeO2 + TiO2 + WO3 + Nb2O5 + Bi2O3) * 100 is more than or equal to 30 and less than or equal to 75. Tests show that when the thickness of the glass is 10 mm, the refractive index of the glass is 2.09-2.35, and the transmittance of the glass with the wavelength lambda 70 smaller than 450 nm is 82.4%-96.8%. The problems that in the prior art, high-refractive-index glass is low in refractive index and light transmittance and low in performance and cost ratio, and the increasingly-developed visual experience and development requirements of head-mounted displays cannot be met are solved.

The invention discloses optical glass, a prefabricated member thereof, an optical element and an optical instrument, and relates to the technical field of optical glass. The optical glass comprises the following components in percentage by weight: 2 to 15.2 percent of SiO2; 8 to 22 percent of B2O3; la2O3: 40% to 60%; 3 to 18 percent of Y2O3; zrO2: 1%-15%; 2 to 15 percent of Nb2O5; 0 to 9 percent of Gd2O3; znO: 0 to 10%; 0 to 10 percent of Ta2O5; 0 to 6 percent of TiO2; 0 to 10% of RO; 0 to 8% of Rn2O; 0 to 8 percent of WO3; 0 to 5 percent of Al2O3; 0 to 8 percent of Yb2O3; 0 to 5 percent of GeO2; 0-1% of a clarifying agent; (Gd2O3 + ZnO) / Y2O3 is 2.0 or less; the thermal expansion coefficient alpha-30 / 70 DEG C of the optical glass is below 85 * 10 <-7 > / K, and the abrasion degree FA is 75-120. The high-refractive-index optical glass obtained by the invention has relatively low thermal expansion coefficient and excellent abrasion degree.

The invention discloses a stone processing and conveying device, and relates to the technical field of stone conveying. The conveying mechanism comprises a transmission mechanism used for conveying, a rack connected with the transmission mechanism, a sweeping assembly connected with the transmission mechanism, a dust collection assembly connected with the sweeping assembly, a conveying wall connected with the conveying mechanism and a straightening assembly connected with the conveying wall. The stone sorting device has the advantages that when stone is placed on the conveying belts on the two sides of the transmission mechanism, telescopic cylinders in the straightening assemblies stretch out and draw back along with telescopic springs and abutting blocks, a plurality of rollers rotate, the posture of the stone is straightened in cooperation with the conveying belts, and the stone sorting device is high in sorting efficiency and good in sorting effect. The stone conveying device solves the problems that due to the fact that the shapes of stones are irregular, the stones are often stuck, the posture is not correct, the conveying efficiency is affected, and even equipment is damaged.

The utility model relates to the technical field of vibrating screens, in particular to a rice processing vibrating screen convenient to install, which comprises a screening assembly, the screening assembly comprises a support frame, the top of the support frame is connected with a screen body, the discharge end of the screen body is connected with a discharge bin, and the lower part of the discharge bin is fixedly connected with a discharge pipe; and the positioning assembly comprises a hinge shaft and a positioning ring, the hinge shaft and the positioning ring are fixedly connected to the outer wall of the discharging pipe, a first clamping ring and a second clamping ring are rotationally connected to the outer portion of the hinge shaft, and the first clamping ring and the second clamping ring correspond to the outer portion of the positioning ring. Through the arrangement of the positioning assembly, the packaging bag can be conveniently installed and positioned, through the arrangement of the extrusion clamping structure outside the circumference, the circumference of the packaging bag can be extruded and positioned, and therefore the packaging bag can be conveniently and rapidly installed and positioned, and through the arrangement of the positioning teeth, the positioning effect on the packaging bag can be improved; and the packaging bag is further prevented from slipping off.

The invention provides optical glass, which comprises the following components in molar percentage: 25-40% of SiO2; 1 to 8 percent of B2O3; 1 to 8 percent of La2O3; 1 to 6 percent of BaO; 5 to 25 percent of CaO; 5 to 15 percent of Nb2O5; 8 to 20 percent of TiO2; the content of SiO2 and B2O3 is 27%-45%, and the content of Li2O is 1.5%-15%. The optical glass contains a proper amount of SiO2, alkali metal oxide and other components, so that the optical glass has excellent anti-devitrification performance; the optical glass contains high-refractive-index components such as Nb2O5 and TiO2, so that the optical glass has a relatively high refractive index; through reasonable component design, the glass has low relative partial dispersion.

The utility model discloses a dry-mixed mortar material proportioning and feeding device, and relates to the technical field of dry-mixed mortar production. The weighing device comprises a feeding bin, a weighing assembly and a discharging bin, a plurality of supporting plates are fixed to the upper portion of the inner wall of the feeding bin at equal intervals, a hydraulic cylinder is fixed to the top of each supporting plate, a piston rod is movably connected into each hydraulic cylinder, the piston rods are movably connected into the supporting plates, and plug blocks are fixed to the bottom ends of the piston rods. A discharging bin is fixed to the bottom of the feeding bin, the lower portion of the inner wall of the discharging bin is movably connected with a weighing assembly, the weighing assembly comprises an inclined table, and the inclined table is arranged in a front-back penetrating mode and movably connected to the lower portion in the discharging bin. According to the dry-mixed mortar material proportioning device, the upper material bin, the weighing assembly and the lower material bin are arranged, so that the problems that the proportioning process of dry-mixed mortar materials needs long time, the period is short, and pollution cannot be reduced at the same time are solved.

The invention relates to the technical field of organic chemistry, in particular to a novel high-sulfur-content photopolymerizable high-refraction monomer and a preparation method thereof.The series of high-refraction structures are not reported in literatures at present, dithiocyclopentane serves as a connecting unit and is combined with a series of structural units with the high molar refractive index and photocurable groups, and the novel high-sulfur-content photopolymerizable high-refraction monomer is obtained. The refractive index of the material is improved, the monomer is ensured to be in a liquid state, and the monomer is easy to dissolve, full-solid and pollution-free in the polymerization process; the structure contains rigid large conjugated aromatic rings and high-sulfur content dithiocyclopentane methyl mercaptan, so that the dispersion of the material is reduced, and meanwhile, certain physical properties are endowed.

This invention discloses a high-elongation cast Al-Cu-Zn-Mg alloy with good resistance to hot cracking. The alloy composition, by mass percentage, includes: Cu 3.5–4.5%, Mg 0.4–1.5%, Mn 0.2–0.5%, Ti 0.10–0.2%, Zn 2.5–3.5%, with the balance being Al and unavoidable impurity elements. Addressing the limitations of existing Al-Cu casting alloys, such as wide solidification temperature range, poor fluidity, and hot cracking, this invention provides a high-Zn-content Al-Cu-Zn-Mg alloy with good resistance to hot cracking. This alloy has a low melting point, a narrowed solidification temperature range, and excellent resistance to hot cracking and mechanical properties. It can be used for various high-strength cast aluminum alloy structural parts, effectively avoiding casting defects such as hot cracking, shrinkage cavities, and porosity, and significantly improving the overall mechanical properties of the alloy.

The invention discloses optical glass, a prefabricated member thereof, an optical element and an optical instrument, and relates to the technical field of optical glass. The optical glass comprises the following components in percentage by weight: 5-25% of SiO2 and B2O3; 45 to 70 percent of La2O3, Y2O3 and Gd2O3; zrO2: 2%-15%; 1 to 15% of Nb2O5; 5%-20% of TiO2; 0 to 5 percent of Ta2O5; 0 to 10% of RO; 0 to 8% of Rn2O; 0 to 5 percent of WO3; znO: 0 to 10%; 0 to 8 percent of Al2O3; 0 to 10 percent of Yb2O3; 0 to 5 percent of GeO2; 0-2% of a clarifying agent; wherein the ratio of the Nb2O5 to the Y2O3 is 0.1 to 2.0; rO is one or more of MgO, CaO, SrO and BaO; the Rn2O is one or more of Li2O, Na2O and K2O; and the clarifying agent is one or more of Sb2O3, SnO, SnO2 and CeO2. The optical glass provided by the invention has higher Young modulus and hardness while having expected refractive index and Abbe number.

The utility model provides a glass melting feeding device. Relates to the technical field of feeding dust removal. The glass melting feeding device comprises a moving table and a vertical plate fixedly installed at the top of the moving table, a feeding hopper is fixedly installed on one side of the vertical plate, two connecting pipes are fixedly installed on the vertical plate, and horn pipes are fixedly installed at the ends, close to the feeding hopper, of the two connecting pipes correspondingly. The two horn pipes are located above and below the feeding hopper correspondingly, a water filtering tank is fixedly installed at the top of the moving table, an exhaust fan is fixedly installed at the top of the water filtering tank, a transverse table is fixedly installed on the side, away from the feeding hopper, of the vertical plate, an air inlet pipe is fixedly installed on the transverse table, and two closing covers are arranged below the transverse table. The glass melting feeding device provided by the utility model has the advantages that the dust purification function is realized, and the use safety performance is improved.

The application discloses a method for improving signal-to-noise ratio of femtosecond transient absorption spectrum, which comprises a femtosecond transient absorption spectrometer with an inner wall having an optical absorption coating, and the femtosecond transient absorption spectrometer is further internally provided with a low-dispersion laser focusing assembly and a micro-nano reflection assembly in front of a sample table, the micro-nano reflection assembly comprises a reflection structure and a light transmission area, the reflection structure is not completely perpendicular to an incident light path, so that the light path reflected by the reflection structure can irradiate the optical absorption coating; the low-dispersion laser focusing assembly focuses supercontinuum white light and provides dispersion to the micro-nano reflection assembly, and the micro-nano reflection assembly selectively reflects according to the dispersion effect to adjust the spatial distribution of light of different wavelengths near a focal point. The application adjusts the transmission rate of the probe white light by the micro-nano reflection assembly, and does not cause the pulse width of the femtosecond pulse probe white light to be widened. Under the premise of maintaining the maximum time resolution of the femtosecond transient absorption spectrum, the signal-to-noise ratio of the femtosecond transient absorption spectrum is effectively improved.

The invention discloses a dynamic optical scanning holographic encryption system based on time-space joint imaging, which comprises a laser, a light beam emitted by the laser is divided into two light beams by a beam splitter, one transmission light beam irradiates an orbital angular momentum multiplexing hologram, and the other transmission light beam irradiates an orbital angular momentum multiplexing hologram. One beam of reflected light is transmitted to a beam combiner through a space-time coupling spring light generation module and an optical delay line module in sequence, and the other beam of reflected light is transmitted to the beam combiner through a plane mirror, an optical switch and an encryption key in sequence, so that the other beam of reflected light interferes with the time-delayed space-time coupling spring light to generate dynamic interference fringes, and the dynamic interference fringes are scanned through a Fourier transform lens and a scanner; the time-space coupling spring light generation module is used for generating time-space coupling spring light, and the optical delay line module is used for carrying out delay processing on the time-space coupling spring light and realizing accurate modulation time delay. The invention further discloses a dynamic optical scanning holographic encryption method based on time-space combined imaging.

The application provides a high beam module and a vehicle lamp. The high beam module comprises a light source for emitting light; a high beam lens arranged on the light emitting side of the light source, the high beam lens being an integral structure, the high beam lens comprising a light inlet surface, a first total reflection surface, a second total reflection surface, a third total reflection surface and a light outlet surface, the second total reflection surface and the third total reflection surface being oppositely arranged along a first direction, the light outlet surface being located on one side of the third total reflection surface along a second direction, the light emitted by the light source being projected to the first total reflection surface through the light inlet surface, the parallel light being formed after being reflected by the first total reflection surface, the parallel light being reflected by the second total reflection surface and the third total reflection surface in sequence, and the parallel light being emitted by the light outlet surface to form a high beam light pattern; the light outlet surface comprises a plurality of sub-light outlet surfaces arranged in sequence along a third direction, and the distance between the root of each sub-light outlet surface and the light source along the second direction gradually increases along the third direction. The application can improve the light efficiency of the high beam module while ensuring the narrow opening size.

The utility model relates to rainwater and garbage separation technical field, concretely is a kind of separation device of rainwater and garbage separation, including separator main body, the water inlet is arranged in the side of separator main body, the water outlet is arranged in the other side of separator main body, and the flange of the other end of water outlet is connected with drain pipe;Guide cylinder, the inner wall of separator main body is fixedly connected with guide cylinder, and the inside of guide cylinder is inserted with barrier net, the filter cylinder is inserted between barrier net and guide cylinder, and the upper fixed connection of filter cylinder has hanger. The utility model is through the setting of water outlet water inlet end rectangle structure, so that it can better realize the material guiding of rainwater, effectively avoid the residual of rainwater in separator main body, ensure rainwater fully separated material guiding, avoid the floating situation caused by garbage following overflow hole position to appear simultaneously, further improve the stability of rainwater garbage filtration, ensure that garbage is impacted and accumulated in the bottom of filter cylinder.

The invention relates to the technical field of energy photoelectron application, in particular to a high-contrast laser pulse time domain precise beam combining device and an implementation method thereof, and the device comprises a single longitudinal mode fiber laser, a 1 * 2 beam splitter, an arbitrary waveform generator, an amplitude modulator, an adjustable optical attenuator, an adjustable fiber delay line and a 2 * 1 beam combiner, according to the precise beam combining device, by comprehensively adjusting the arbitrary waveform generator, the adjustable optical attenuator and the adjustable optical fiber delay line, multi-step laser pulses with high contrast ratio and high stability can be finally obtained, and the problem that when the pulse energy of laser pulses generated by an existing arbitrary waveform generator is low, the pulse energy of the laser pulses is low is solved. The technical problems of poor pulse stability and difficulty in precise regulation and control of optical fiber optical delay and pulse energy of laser pulses in a laser pulse time domain beam combining device or influence of other beam combining methods on the quality of combined laser beams in the prior art are solved.

The present application belongs to the field of radio wave propagation theory and electromagnetic field numerical calculation technology, and discloses a low-dispersion very low frequency radio wave propagation characteristic prediction method.The present application method aims at the defects of large numerical dispersion, low calculation efficiency and high resource occupation of the existing FDTD method in long-distance, complex layered medium scene, and realizes high-precision and high-efficiency prediction of the very low frequency radio wave propagation characteristic in seawater-air-ionosphere medium by combining HIE-FDTD method and M(2,4)FDTD method through three-layer processing of the whole calculation area.The present application method solves the contradiction between reducing numerical dispersion error and reducing computer consumption of the traditional FDTD method, can greatly reduce computer memory resource occupation and improve calculation speed while ensuring prediction accuracy, is suitable for electromagnetic propagation simulation of large-size, complex medium and terrain, and has obvious advantages in phase delay prediction of very low frequency ground wave propagation.

The invention relates to the technical field of laser measurement, in particular to a laser measurement device with good pointing stability. The device comprises a shell, a laser generator, a laser channel and an adjusting channel. The laser generator is arranged in the shell, one end of the laser channel is connected with a light outlet of the laser generator, the adjusting channel perpendicularly penetrates through the laser channel, the two ends of the adjusting channel are both connected with external gas cylinders, convex lenses are arranged at the junctions of the adjusting channel and the laser channel, and the convex lenses enable laser beams to penetrate through the adjusting channel. And the temperature or the speed of the flowing air flow in the adjusting channel is controlled to carry out offset adjustment on the laser beam. The laser channel is arranged to be connected with the laser generator, the laser beam which is just emitted is transmitted through the laser channel, the laser channel effectively prevents the laser beam from making contact with the surrounding environment of the laser generator, and the influence of the surrounding environment temperature difference caused by heating of the laser generator on the directivity of the laser beam is avoided; and the laser pointing stability is greatly improved.

The embodiment of the invention provides a lens system, a fingerprint identification device and terminal equipment. The lens system comprises a first lens and a second lens which are sequentially arranged from an object side to an image side; the first lens is a lens with negative focal power, and the surface, facing the object side, of the first lens is the surface with the largest size in the lens system; the second lens is a lens with positive focal power; the maximum effective size D11 of the surface, facing the object side, of the first lens and the maximum effective size D21 of the surface, facing the object side, of the second lens meet the following conditions: 0.2 lt; (D11-D21) / THlt; tH is the distance from the surface, facing the object side, of the first lens to the surface, facing the object side, of the second lens in the optical axis direction; the maximum image height Y ', the focal length f and the optical length CTL of the lens system on an imaging surface meet the following conditions: 0.5 lt; y ' / (f * CTL) lt; 1.24, the optical length CTL represents the distance from the surface, facing the object side, of the first lens to the imaging surface. According to the technical scheme, the lens system has a small horizontal direction size and good imaging performance.

The utility model discloses a hard tube endoscope optical image rotation lens group and optical image rotation system, the optical image rotation lens group comprises a left side Hopkins rodlike lens group and a right side Hopkins rodlike lens group, the left side Hopkins rodlike lens group and the right side Hopkins rodlike lens group have the same structure and are arranged in a bilateral symmetry mode, the left side Hopkins rodlike lens group comprises a Hopkins rodlike lens and a glued Hopkins rodlike lens, the glued Hopkins rodlike lens is arranged on the left side Hopkins rodlike lens, and the glued Hopkins rodlike lens is arranged on the right side Hopkins rodlike lens. The glued Hopkins rodlike lens is formed by gluing a Hopkins rodlike lens and a Hopkins rodlike lens, and the convex surface of the glued Hopkins rodlike lens faces the diaphragm. The Hopkins rodlike lens is a convex lens, the Hopkins rodlike lens in the glued Hopkins rodlike lens is a concave lens, and the Hopkins rodlike lens is a convex lens. According to the utility model, the aberration of the hard tube endoscope image rotation lens group can be more effectively corrected, the installation is convenient, and the image quality is improved.

This invention discloses a graded-index non-zero dispersion-shifted optical fiber based on orbital angular momentum modes, comprising an optical fiber body including a ring core and an optical fiber cladding surrounding the ring core. The optical fiber cladding includes a circular region inside the ring core and an outer optical fiber cladding outside the ring core. This invention aims to provide a feasible optical fiber structure for suppressing four-wave mixing to meet the requirements of low-dispersion transmission of multiple orbital angular momentum modes.

The invention provides a device and a method for controlling kinetic energy dispersion of static trap ions, the device for controlling kinetic energy dispersion of static trap ions comprises a power supply, and a first vacuum cavity and a second vacuum cavity which are communicated, the first vacuum cavity is internally provided with a first lens group for ion compression, and the second vacuum cavity is internally provided with a detector; the electrostatic trap comprises a second lens group, the second lens group is arranged in the second vacuum cavity and comprises a plurality of electrodes which are arranged in sequence, and each electrode is provided with a channel allowing ions to pass through; the power supply supplies power to the second lens group; the ion detection unit is used for detecting whether ions pass through the second lens group; and the controller adjusts the voltage on the second lens group according to the output of the ion detection unit, so that the preorder ions in the ion sequence entering the second lens group are decelerated, and the subsequent ions are accelerated. The device has the advantages of simple structure and the like.

The utility model relates to optical field, concretely is a kind of traffic lens and imaging device, the traffic lens is sequentially composed of fixed lens group of positive focal power, focusing lens group of negative focal power and compensation lens group of positive focal power from object plane side to image plane side;The focusing lens group moves along the main optical axis direction of the traffic lens, for adjusting the object distance of the traffic lens;The traffic lens satisfies the following conditional formula:-4 The focal length of focusing lens group is reduced, the focal length of focusing lens group front group and rear group is optimized, the possibility of excessive volume of front group and rear group is reduced, the traffic lens has small change in resolving power, and the miniaturization of traffic lens is realized.

The invention discloses an ultra-wideband micro-coaxial 180-degree phase shifter. The phase shifter comprises a main path and a reference path, the main path is composed of a 180-degree anti-phase transition structure; the reference path is composed of a 0-degree straight-through transmission structure. The broadband 180-degree phase shifter is realized by constructing an inner and outer conductor reverse connection structure through rectangular micro coaxial slotting, the broadband 180-degree phase shifter has the advantages of miniaturization, low loss and the like, and a miniaturized, lightweight, highly integrated and low-cost three-dimensional millimeter wave system can be constructed.