134 results about "Annular beam" patented technology

A quickly installed, expandable, and modularly designed louver awning includes several leg tubes, a ring beam frame disposed on upper ends of the leg tubes, and a louver system disposed on the ring beam frame. The ring beam frame includes several ring beams slidably installed on the leg tubes, ring beam linings are firmly disposed in ends of the ring beams, and the ring beam linings are connected to the leg tubes through first fasteners. The ring beams and the leg tubes are connected through leg tube linings and the ring beam linings, so that structural strength of the ring beams and the leg tubes is increased, a part quantity is reduced, assembly is easier to operate with a smaller error, and the fasteners are not exposed, thereby providing better aesthetic appearance.

The invention discloses an aerial target velocity vector remote sensing method. The method comprises the following steps: transmitting an annular light beam with a linear divergence characteristic through a laser radar system; the receiving system is divided into two paths, one path obtains the distance of a target through a distance measuring detector, and the other path obtains the azimuth angle of the target through an area array sensor; establishing a three-dimensional coordinate system, resolving to obtain a spatial three-dimensional coordinate of the target relative to the laser radar system based on the divergence characteristic, the distance and the azimuth angle of the annular beam, and recording a timestamp; when the target passes through the annular light beam for multiple times, clustering data points based on spatial-temporal characteristics: data continuously collected at the same position belong to the same cluster; and averaging data belonging to the same cluster, and when two clusters of effective data exist and azimuth angles are different, calculating a velocity vector of the target relative to the laser radar system. By utilizing the method, the spatial position and the velocity vector of the target can be quickly and accurately obtained under a simple background.

The invention relates to the technical field of civil engineering, and discloses a parking garage rebuilding method and parking garage based on an intercity railway shield tunnel circular working well, and the parking garage rebuilding method based on the intercity railway shield tunnel circular working well comprises the following steps: after the structure evaluation of the shield tunnel working well meets the rebuilding standard, rebuilding the shield tunnel working well; a shield tunnel working well is transformed and planned, and an annular parking space layout and an annular beam utilization scheme are obtained; according to the annular parking space layout and the annular beam utilization scheme, multiple layers of annular parking areas are formed in the shield tunnel working well; and elevators are installed on the reserved lifting channels of the first layer and the multiple standard layers, inner ring rotating platforms are installed on the multiple standard layers, carriers are deployed on the first layer and the multiple standard layers, and reconstruction of the underground cylindrical three-dimensional parking garage is completed. The annular structure of the abandoned working well is converted into the multi-layer three-dimensional parking space, so that backfilling of the working well is avoided, the cost is reduced, and the resource utilization rate is increased.

An optical detector system providing output signals. The system includes a ring-type photodetector, having an open center and multiple ring detector segments each separated by a gap, and an integral lens for receiving incident light and generating a beam spot on the photodetector. The lens includes an axicon and an asphere with a surface defined by both odd and even polynomial terms. The light does not fall outside or inside of the ring detector segments when the incident light is moved laterally off an optical center line but an intensity of the light is shifted around the ring detector segments. The detector system also may include a computer system configured to determine, based on the output signals, first data indicative of a direction of the beam spot relative to a predetermined point on the photodetector and second data indicative of a distance between the beam spot and the predetermined point.

The invention relates to a storage tank assembly type suspended ceiling which comprises a supporting beam, a suspended ceiling hanging rod, a corrugated plate laid on the supporting beam and a sealing device used for sealing the suspended ceiling and the inner wall of a storage tank, the sealing device comprises a suspended ceiling edge plate, a sealing ring plate, a sealing wall plate and an elastic blanket, the suspended ceiling edge plate is fixed to the upper portion of the outermost suspended ceiling annular beam, and the sealing ring plate is fixed to the upper portion of the sealing wall plate. The sealing ring plate is in a ring shape around the inner wall of the storage tank, the sealing ring plate is fixed to the upper portion of the suspended ceiling edge plate, the sealing ring plate is also an annular plate and partially overlaps with the suspended ceiling edge plate, the sealing ring plate is fixed to the inner side wall of the sealing wall plate, the sealing wall plate is in a vertically-open cylinder shape around the inner wall of the storage tank, and an inner tank reinforcing ring is fixed to the upper portion of the inner tank wall. The lower end of the sealing wall plate is connected with the inner tank reinforcing ring. According to the suspended ceiling, the elastic blanket can be directly seen and is easy to install, inspect and maintain, the outermost ring of the suspended ceiling is changed into a form of combining the circular suspenders and the flat steel, so that the stress of the vertical suspenders and the inclined suspenders is uniform, and the inclined suspenders are prevented from being damaged.

The invention provides an annular beam lens group, a coaxial wire feeding optical module and a laser cladding processing head, and relates to the technical field of welding. The annular beam lens group comprises a first reflection optical assembly and a second reflection optical assembly which are sequentially arranged along a laser transmission path; the first reflection optical assembly comprises a first reflecting mirror and a first driving unit, the first reflecting mirror is provided with a first reflecting surface, and the first driving unit is used for driving the first reflecting mirror to rotate around a first rotating axis; the second reflecting optical assembly comprises a second reflecting mirror and a second driving unit, the second reflecting mirror is provided with a second reflecting surface, and the second driving unit is used for driving the second reflecting mirror to rotate around a second rotating axis; and the second reflecting mirror and the second reflecting mirror are configured to rotate synchronously, so that the first reflecting surface and the second reflecting surface are in a parallel state, and the first rotating axis and the second rotating axis are arranged in parallel. The laser energy utilization rate can be increased, and the welding quality is improved.

A multifunctional electric louvered awning including a ring beam frame, leg pipes for supporting the ring beam frame, and a louvered canopy, is provided. The ring beam frame includes first ring beams and second ring beams for connecting the first ring beams on both sides. Each first ring beam includes upper and lower ring beams. The upper ring beam is fixed to a clamping part of the lower ring beam. The louvered canopy is installed on the first ring beams and includes multiple louver boards arranged in sequence and a drive assembly for opening and closing the louver boards. The drive assembly includes a telescopic motor and a linkage rod. The telescopic motor is suspended from a bottom surface of the clamping part through a mounting base. The linkage rod is connected to a telescopic end of the telescopic motor to link with the louver boards.

The utility model discloses a pipe-jacking tunneling machine cutterhead which comprises a support and a tunneling assembly, the tunneling assembly comprises a main spoke arm set and a secondary spoke arm set, and the main spoke arm set and the secondary spoke arm set are both installed on one side of the support; the support is provided with a first annular beam and a second annular beam, the first annular beam and the second annular beam are arranged on one side of the support, and the first annular beam is arranged on the outer side of the second annular beam in a sleeving mode; the main spoke arm group is mounted on the first annular beam; and the secondary spoke arm group is mounted between the first annular beam and the second annular beam. According to the cutter head of the pipe-jacking heading machine, one side, provided with the main spoke arm group and the secondary spoke arm group, of the support is arranged towards the heading direction, and the other side of the support is connected to the heading machine main body, so that the heading machine main body drives the main spoke arm group and the secondary spoke arm group to perform heading on a rock wall through the support.

The invention provides a foundation structure of a fused salt storage tank of a photo-thermal power station, which comprises a composite thermal insulation layer and a reinforced concrete retaining wall, the composite thermal insulation layer is arranged below a tank bottom plate of the fused salt storage tank, and the composite thermal insulation layer comprises a top cushion layer, ceramic fiber cloth and a ceramsite soil layer which are sequentially arranged downwards; an annular beam is arranged at the top of the composite heat preservation layer and composed of an annular steel plate and a heat-resisting concrete layer which are sequentially arranged below the tank bottom plate, a protective ring wall is arranged in the circumferential direction of the composite heat preservation layer, and a concrete foundation cushion layer with a built-in ventilation pipe and a built-in temperature measuring sleeve is arranged below the composite heat preservation layer. A circle of retaining wall is arranged on the periphery of the retainer wall, and the space between the retaining wall and the retainer wall is filled with compacted plain soil. The foundation structure reduces the leakage risk of molten salt.

A method for laser welding a metal foil stack to a metal substrate includes clamping the foil stack against a support surface of a substrate and irradiating the stack with a beam of laser pulses to weld the foils to the substrate. The beam is a composite beam including a center beam and a surrounding annular beam. An initial series of the laser pulses are incident on the stack at mutually distinct locations on a top surface of the stack, and a subsequent series of the laser pulses are incident on the stack at mutually distinct locations on a side of the stack. The resulting weld nuggets penetrate deeply into the stack, with an average penetration depth that exceeds an average pitch between the weld nuggets. The method is capable of welding more than 100 foils to the substrate. Welded assemblies have been demonstrated to withstand large shear forces.

The utility model relates to a radial and annular beam connecting device for a storage tank suspended ceiling, which comprises a plurality of annular beams which are sequentially distributed from the central part to the periphery and a plurality of radial beams which are radially distributed, and a plurality of radial beams which are uniformly spaced extend from the whole periphery of the innermost annular beam to the inner side of the outermost annular beam. A plurality of radial beams also extend from the last but one inner annular beam to the inner side of the outermost annular beam, and the radial beams and the annular beams are connected at the connecting points through L-shaped connecting plates. The radial and circumferential beam connecting device for the storage tank suspended ceiling overcomes the defects of traditional welding connection, achieves no welding on site, and does not generate gas harmful to human bodies and the environment. Pre-assembly is conducted on the ground outside the tank before installation, the flatness of the whole beam face is guaranteed, meanwhile, construction is easy, and the construction period is shortened.

The invention relates to the technical field of heat dissipation devices, in particular to an annular beam heat dissipation device based on an MEMS device, and the device comprises an air inlet grid port which is located at the uppermost end of the heat dissipation device and is used for enabling external air to enter the heat dissipation device and filtering impurities in the air at the same time; the piezoelectric vibrator is used for driving airflow and providing a reliable power source for each structure at the same time; the flexible FPC is used for providing stable electric energy supply and signal transmission for the piezoelectric vibrator; and the impact platform is used for receiving the heat of the equipment needing to be cooled, taking away the heat through air beam heat exchange and discharging the air flow after heat exchange at the same time. Air flow driving force is formed through vibration of the piezoelectric ceramic piece in an electric field, external cold air is driven into the heat dissipation device, efficient heat dissipation is achieved, and the heat dissipation problem that the performance of a CPU is limited in a narrow space is solved.

A vertical shaft excavation system adopting a wire saw method solves the problems that a vertical shaft excavation system is low in construction efficiency, large in investment, high in cost and long in construction period, a first guide hole and a second guide hole are formed in the upper end and the lower end of a vertical shaft, upper and lower annular beams and upper and lower wire saw machines are installed on the first guide hole and the second guide hole respectively, and upper and lower annular rails are installed on the upper and lower annular beams respectively; the upper cross beam stretches across an upper annular rail at the upper end of the vertical shaft, the lower cross beam stretches across a lower annular rail at the lower end of the vertical shaft, the lateral walking trolley and the forward walking trolley are QSC three-in-one motor-driven rigid wheels, the first upper rope sawing machine, the second upper rope sawing machine, the first lower rope sawing machine and the second lower rope sawing machine are respectively provided with a first driving wheel, a second driving wheel, a third driving wheel and a fourth driving wheel, and the first driving wheel and the fourth driving wheel are respectively located at the upper end and the lower end of a first guide hole. The second driving wheel and the third driving wheel are located at the upper end and the lower end of the second guide hole respectively, and the first-fourth driving wheels and the rope saw chain wind around the first-fourth driving wheels, the upper guide pulley and the lower guide pulley to form a closed loop.

The invention relates to a viaduct stand column wall-attached type self-climbing operation platform and method.The platform comprises a self-adaptive annular supporting system, a grating pavement system and a vertical face fence system, the self-adaptive annular supporting system comprises an annular beam, a jack, a telescopic rod and wall-attached boots, and a pair of wall-attached boots is arranged on the periphery of a stand column standard knot; adjacent wall attaching boots in each pair of wall attaching boots are connected through telescopic rods, and each wall attaching boot is connected with the ring beam through a jack. The grating pavement system comprises a plane grating and a plane laying net, the plane grating is arranged at the top end of the self-adaptive annular supporting system, and the plane laying net is fully laid on the plane grating; the vertical face fence system is arranged on the periphery of the grating pavement system. According to the platform, active self-adaptive adjustment can be conducted on the sectional dimensions of different stand column standard knots, and one-time overall installation and multiple-time flexible in-place of the platform in the whole installation and construction process are achieved through overall cyclic alternate lifting of the operation platform.

An annular cantilever beam spring is capable of exhibiting low friction and hysteresis and stiffness and specifically stiffness / volume far exceeding currently available COTS springs. The spring includes first and second sets of N stand-offs evenly positioned around opposing top and bottom surfaces of a flat annular beam at 360 / N degree intervals and angularly offset with respect to each other by 360 / 2N degrees such that each said stand-off is evenly spaced between adjacent pairs of stand-offs on the opposing surface. The first and second sets of stand-offs are responsive to opposing axial loads to deflect the flat annular beam axially at each stand-off in opposing directions to induce a curvature to the annular beam and store energy in the beam. The spring stiffness is determined by the elastic material properties of the flat annular beam, not the initial geometry as is common with the COTS springs.

A non-pneumatic tire (100) is provided that has a rim (104) with an axis extending therethrough. An annular support (103) extends outward from the rim in a radial direction. A tread (101) is present that has a surface, and a farthest outer axial extent (804) located at a terminal end of the tread in the lateral direction. An annular beam (200) is located between the annular support (103) and the tread (101) in the radial direction. The annular beam (200) has a reinforcement portion (300) that has a plurality of reinforcing elements. The reinforcing element closest to the farthest outer axial extent in the lateral direction is at a width W1 to the farthest outer axial extent in the lateral direction. W1 is at least 8 millimeters.

The invention relates to a method for curing a liner for the rehabilitation of pipes or channels, in which laser light from the curing of a resin-impregnated liner is used, and to the use of an axicon for generating an annular beam profile of a laser for curing a liner for the rehabilitation of pipes or channels.

The application discloses a three-piece Bessel beam shaping system with a diffraction ring, and belongs to the technical field of laser processing, comprising: a beam shaping mirror, a first collimating mirror and a focusing mirror; the incident surface and the exit surface of the beam shaping mirror are annular planes and annular aspheric surfaces respectively, and are used for shaping a collimated Gaussian beam into a point annular beam with energy gradually decreasing from inside to outside; the incident surface and the exit surface of the first collimating mirror are annular aspheric surfaces and annular planes respectively, and are used for collimating the point annular beam; the incident surface of the focusing mirror is a combination of an axicon surface and a spherical surface, and the exit surface is a plane; the focusing mirror is used for focusing the collimated point annular beam into a Bessel beam with a diffraction ring. The application can significantly improve the focal depth of the Bessel beam in laser processing, and can also effectively remove processing materials such as ink. In addition, the focal depth of the Bessel beam in the application is adjustable, and the adjustment mode is more, the flexibility is higher, and is suitable for different laser processing scenes.

The invention belongs to the technical field of environmental protection equipment, and particularly relates to an anti-explosion heat-insulation coal gas high-temperature electric dust remover and a dust removal method. The invention also discloses a method. The device comprises a shell, an annular beam, a heat-insulating high-temperature-resistant explosion venting device, a heavy-load large-displacement sliding support, a dust hopper, a scraper dust conveying device, a dust collecting and conveying mechanism, a dust cleaning mechanism and a cathode and anode matching structure. The shell can bear explosion venting pressure impact of 0.1 MPa, and the shell is of an ultra-large shell structure with the maximum diameter phi of 15.8 m; the dry-process fine dust removal equipment for the low-rank coal pyrolysis gas adopts a high-temperature-resistant and heat-insulating design, can be operated under the condition that the inlet flue gas temperature is less than or equal to 450 DEG C, and the outlet temperature drop is less than or equal to 50 DEG C. The dry-process fine dust removal equipment for the low-rank coal pyrolysis gas adopts a mechanical tracking floating type rapping and sound wave ash removal combined ash removal design. The device meets high-temperature heat insulation operation, tar precipitation and adhesion are avoided, it is guaranteed that the dust removal efficiency reaches 99% or above at the high temperature, and the problem that the dust content of low-rank coal pyrolysis gas and tar recycled from the pyrolysis gas is high is solved.

The utility model discloses a prefabricated steel lattice for vertical shaft bottom sealing underwater separated warehouse pouring, the steel lattice is installed at the bottom in a vertical shaft, the steel lattice comprises core warehouse steel and corner warehouse steel, the core warehouse steel is of a #-shaped structure, right-angle-shaped locking corners are arranged at the four corners of the core warehouse steel, and the corner warehouse steel is connected with the core warehouse steel. The four pieces of corner bin steel are of a right-angle-shaped structure, and the right-angle parts of the four pieces of corner bin steel are installed on the four locking corners of the core bin steel correspondingly. The combined type steel lattice has the advantages that the combined type steel lattice is more beneficial to underwater assembly under limited conditions and can be prefabricated in advance due to the fact that vertical tunneling equipment is hung and the annular beam is arranged for enhancing rigidity of a blade foot area; the integrity of the concrete can be ensured by pouring the large-volume concrete at the bottom of the vertical shaft in different bins underwater; and the density of the bottom sealing concrete can be guaranteed through bin division pouring, holes generated by underwater concrete pouring are eliminated, and water leakage is prevented.

The invention provides a hollow laser processing optical system based on a beam splitting reflector, which belongs to the technical field of laser processing and comprises a collimating lens, a conical lens, a beam splitting reflector, a first plane reflector, a second plane reflector, a third plane reflector, a fourth plane reflector, a beam combining reflector and a focusing lens which are sequentially arranged along a light path. The collimating lens collimates a laser beam, the conical lens converts a circular beam into an annular beam, the beam splitting reflector splits the annular beam into two semi-annular beams, the two semi-annular beams are combined into a complete annular beam by the beam combining reflector after being reflected by the plane reflector, and the complete annular beam is focused by the focusing lens to process a material. The reflector is used for achieving beam splitting instead of a beam splitting lens, the laser processing power and the system stability are improved while light beam shielding is avoided, and the requirements of coaxial wire feeding laser processing and laser-arc coaxial processing can be met.

The present invention provides a light-generation system (1000) including a first light-generation device (110), a luminescent body (1200), a thermally conductive element (500), and an axicon-like optical element (400), wherein: (A) the first light-generation device (110) is configured to generate first device light (111), the first light-generation device (110) including one or more of a superluminescent diode and a solid-state laser; (B) the luminescent body ( (1200) includes a luminescent material (200) configured to convert at least a portion of the first device light (111) into luminescent material light (201), the luminescent body (1200) having an annular shape; and (C) a thermally conductive element (500) configured (a) to be in thermal contact with at least a portion of the luminescent body (1200), and (b) to convert at least one of the first device light (111) and the luminescent material light (201). (D) the axicon-like optical element (400) comprises a first portion (410) and a second portion (420) and has an optical element length (L), the first portion (410) having a conical shape, a first length (L1) and comprising a first end window (411), the second portion (420) having a cylindrical shape, a second length (L2) and comprising a second end window (422), where 0.7≦L2 / L<1; (E) the axicon-like optical element (400) comprises: (a) a first portion (410) and a second portion (420) and having an optical element length (L), the first portion (410) having a conical shape, a first length (L1) and comprising a first end window (411), the second portion (420) having a cylindrical shape, a second length (L2) and comprising a second end window (422), where 0.7≦L2 / L<1; A light generating system is provided that is configured to (a) receive at least a portion of a first device light (111) via a portion (410) and provide an annular beam of the first device light (111) to a luminescent body (1200) via a second portion (420), and (b) collect at least a portion of a luminescent material light (201) via the second portion (420) and provide a beam of luminescent material light (201) via the first portion (410).

The present invention belongs to the technical field of laser welding, and specifically discloses a laser skip welding method for a flat copper wire motor stator winding. The laser skip welding method for the flat copper wire motor stator winding includes the following steps S1: pre-treating the flat copper wire and fixing the flat copper wire to be processed by a fixture; S2: using a vision system to locate the welding positions of the flat copper wire; S3: the laser welding head welds the flat copper wire along a specified welding trajectory by combining a central beam and an annular beam. In practical application, the laser skip welding process of the present invention effectively solves the welding problem caused by the fitting gap at the welding points of the flat copper wire motor winding through the discontinuous welding trajectory, avoids the problem that the laser directly penetrates through the gap to break through the insulating paint film below, reduces the risk of motor insulation failure, and ensures the performance and service life of the motor; the welding efficiency is improved by accurately positioning the welding points through the vision system.

The invention provides a heat absorber installation method using a heat absorber sliding device and the heat absorber sliding device. The heat absorber installation method comprises the steps of installing a heat absorber sliding rail, installing a sliding shoe and sliding a heat absorber. The step of installing a heat absorber sliding rail ensures that the heat absorber sliding rail is composed of two parallel sliding rails; the step of installing the sliding shoe comprises the steps that a bottom floating plate of a sliding device is installed in a sliding rail, the bottom floating plate lifts a main oil top till a square flange on the oil top is tightly attached to a flange on the lower surface of an annular beam of a heat absorber, the sliding device is adjusted, the oil top flange is right opposite to a supporting annular beam bottom plate flange, and bolt connection is used for final tightening. And S30, the step of sliding the heat absorber comprises the substeps that after it is checked and confirmed that the installation positions of the sliding devices are correct, the center main jack is jacked till the center main jack makes contact with a flange of the supporting ring beam, the four sliding lifting devices are operated by one control system, it is ensured that the hydraulic lifting devices act at the same time, and the heat absorber is horizontally lifted.

According to the technical scheme, the novel anti-splashing light path system for laser welding is characterized in that the novel anti-splashing light path system for laser welding comprises a laser optical fiber, a collimating lens is arranged at the output quartz end of the laser optical fiber, and two circular truncated cone lenses are arranged on the bottom face of the collimating lens; a laser beam emitted by the laser optical fiber firstly passes through the collimating lens, the collimating lens is used for converting the laser beam from a divergent state into a parallel beam, and the collimated laser beam then passes through the two circular truncated cone mirrors, so that the beam is divided into two parts when passing through the lens, and the two parts are separated into two parts. A laser beam with the area of the top face of the circular truncated cone mirror equal to the diameter of the top face of the circular truncated cone is directly transmitted to be a combination of a central high-energy beam and an annular beam, the beam passing through the circular truncated cone mirror is finally focused through the focusing lens, the beam is concentrated on a small point, a final welding spot is formed, and the laser power utilization rate is optimized through the design. And welding spatter is effectively reduced, and the welding quality and efficiency are improved.

The utility model relates to the technical field of laser drilling, in particular to a laser machining head and a laser machining system for long-focal-depth annular light spot drilling. The laser processing head comprises a hollow shell, a first optical element, a second optical element and a third optical element, and the first optical element, the second optical element and the third optical element are sequentially arranged in an inner cavity of the shell at intervals in the laser beam emitting direction. The first optical element is used for adjusting the laser beam into a long-focal-depth annular beam with uniformly distributed radial energy; the second optical element and the third optical element are used for modulating the long-focal-depth annular light beam into a long-focal-depth annular light spot. According to the laser processing head for drilling the long-focal-depth annular light spot, the outer diameter and the focal depth of the long-focal-depth annular light spot can be controlled by changing the focal lengths of the second optical element and the third optical element. And the long-focal-depth annular light spot forms an annular modified area which has a certain depth and is uniformly distributed in a processed sample.

The invention discloses an annular light generating device based on a diffuser, which is applied to the technical field of optical equipment, and aims to solve the problems that the annular light generating device is complicated in structure and inconvenient to use and influences the performance of an annular light beam, the annular light generating device comprises the diffuser and a driving mechanism, and the diffuser is connected with the driving mechanism; a first side surface of the diffuser is provided with a micro-lens unit array for diffusing and homogenizing light beams, and a second side surface of the diffuser is provided with a grating for deflecting incident light beams; the first side surface is opposite to the second side surface; the driving mechanism is used for driving the diffuser to rotate around the axis; the diffuser is used for performing scattering and dodging shaping on vertically incident laser beams through the micro-lens unit array on the first side surface in the rotating process, outputting light beams with inclination angles through the grating on the second side surface, and rotating at a high speed under the driving of the driving mechanism to form annular light beams; the device is simple in structure, small in size, low in manufacturing and machining difficulty, convenient to use and capable of improving the annular beam performance.

This invention discloses a flat plate lens and device for multi-angle annular uniform illumination in the terahertz band, relating to the field of terahertz active imaging. By setting multiple annular grooves or constructing a randomly rough surface on the exit surface of a flat plate lens with an air hole array and a center point defect, this invention can convert a Gaussian-distributed terahertz beam irradiated by a terahertz source into a multi-angle annular uniform illumination beam. This allows the terahertz wave to illuminate the target from different angles, increasing the reflected wave signal entering the detection system. This has significant application value for terahertz waves in non-destructive testing and human security inspection. Furthermore, in a reflective terahertz active imaging system, compared to a circular beam, the annular beam can convert small-angle incident light with low imaging utilization in the central part into large-angle incident light with higher imaging utilization, thus improving energy utilization while providing multi-angle illumination.

A foundation structure in a tank top comprises a spherical shell and a plurality of radial beams arranged on the protruding side of the spherical shell, the spherical shell comprises a plurality of tank top plates which are sequentially welded in a sealed mode in the circumferential direction, and the radial beams are welded to the tank top plates in a one-to-one correspondence mode. The foundation structure does not need to be completed above the tank wall, and the construction difficulty is reduced. The tank top further comprises a plurality of annular beams distributed in the circumferential direction of the spherical shell, and the two ends of each annular beam are welded to the two corresponding adjacent radial beams correspondingly. The two axial ends of the annular plate are welded to the sunken side of the tank wall and the sunken side of the spherical shell in a sealed mode respectively, the annular plate is located between the spherical shell and the tank wall, the annular plate can be welded to one end of the tank wall firstly, then the foundation structure prefabricated into a whole is hoisted and then connected to the annular plate, and the construction difficulty is reduced; the strength is guaranteed, the storage tank structure and the preparation process are simple, the construction difficulty and the preparation cost are low, and the technical problems that the storage tank top is large in construction difficulty and high in preparation cost are solved to a certain extent.