454results about How to "Small caliber" patented technology

The inventive system includes an elongated band, which includes a urethral area at a central part of the band, the band including a first set of holes, one of the first set of holes located on one side of the central part and another of the first set of holes located on the other side of the central part along the length of the band, first threads passing through the first set of holes and configured to permit loosening of the band following the placement of the band and the conclusion of the operation, and a second set of holes located closer to distal ends of the band than the first set of holes, and second threads passing through the second set of holes and configured to permit tightening of the band following the placement of the band and the conclusion of the operation.

The present invention discloses a convex aspheric surface reflector surface shape detection device and method which can detect a convex aspheric surface reflector of a large caliber (the caliber is more than 200 mm) by using a CGH compensator of a small size on the condition of guaranteeing the detection precision. The device of the present invention converges the light beams via a lens, so that the caliber of the adopted CGH compensator is very small, and the CGH compensator can realize the high-precision detection of the surface shape of the convex aspheric surface reflector of the large caliber within a high-precision processing size range. The method of the present invention is characterized by combining the phase difference compensation effect of the CGH compensator to the wavefrontsand the convergence effect of the lens to the light beams and using the CGH compensator of the small size to detect the convex aspheric surface reflector of the large caliber, solves the problems thata conventional CGH compensation detection method only can detect the surface shape of the convex aspheric surface reflector of the small caliber, and can detect the convex aspheric surface reflectorsof various curved surface types by being compared with the conventional convex aspheric surface reflector surface shape detection method.

The invention relates to a dual-polarized oblique beam waveguide slot array antenna. The dual-polarized oblique beam waveguide slot array antenna comprises more than one unit array antenna; the unit array antenna is formed by a horizontally polarized linear array and a vertically polarized linear array; the horizontally polarized linear array and the vertically polarized linear array are arranged in a horizontal staggered mode; the horizontally polarized linear array is arranged on the upper layer; the vertically polarized linear array is arranged on the lower layer; a horizontally polarized single ridge waveguide is provided with a broadside V-shaped radiation slot; a vertically polarized single ridge waveguide is provided with a broadside U-shaped radiation slot; a feed portion is in a ridge waveguide form and accordingly the integral bandwidth of the antenna is effectively guaranteed, the antenna achieves beam inclination, meanwhile the matching bandwidth of the antenna and the radiation efficiency are guaranteed. The integral antenna can achieve a good circular polarization axial ratio characteristic and meanwhile achieve a 45-degree fixed beam inclination angle due to appropriate phase compensation of a feed network. Compared with the waveguide slot antenna at the same frequency band, the dual-polarized oblique beam waveguide slot array antenna is small in size, low in profile and effectively reduces costs due to a bolt fastening installation mode.

The invention discloses an onboard goggle-type helmet display optical system, and provides a large-field optical display system. The optical display system comprises an image source, a relay lens assembly, a prism assembly and a concave surface reflector along optical axis direction in sequence, wherein, the concave surface reflector receives and reflects image light of the image source from the prism assembly; the concave surface reflector has a bending angle corresponding to the image source, thus asymmetric astigmation is generated in the reflection image; the bending angle is defined as an included angle between an optical axis and a normal line of each point of the inner surface of the concave surface reflector; the relay lens assembly is composed of three groups of a front group, a middle group and a rear group; each group respectively comprises a plurality of lens; the front group closes to the prism assembly, the rear group closes to the image source, and the middle group is positioned between the front group and the rear group in the optical axis direction; the three groups of the front group, the middle group and the rear group can be respectively used as a whole to translate and rotate to form a crossing angle between the local area shafts of the front group lens, the middle group lens and the rear group lens, thus compensating the asymmetric astigmation of the optical display system.

The invention discloses a two-waveband common-path and common-focal-plane imaging system, belongs to the technical field of optics and aims at solving the problems of poor quality, large size, long length, difficulties in eliminating stray light and the like in the prior art. The two-waveband common-path and common-focal-plane imaging system comprises a main mirror, a secondary mirror, a relay lens group and a focal plane detector. The main mirror, the secondary mirror, the relay lens group and the focal plane detector are on the identical optical axis, the reflecting surface of the main mirror and the reflecting surface of the secondary mirror are arranged oppositely, the main mirror is provided with a central hole, the relay lens group and the focal plane imaging detector are arranged inside the central hole of the main mirror, the relay lens group is arranged between a first image surface and the focal plane detector, and the main mirror and the secondary mirror are of a Cassegrain structural form. The two-waveband common-path and common-focal-plane imaging system utilizes the reflecting mirrors to fold light paths, so that the size and the weight of the lens can be reduced, the length can be fabricated to smaller than 0.6 time of the focal length; and by means of the secondary imaging mode, the elimination of the stray light becomes easy.

The application discloses an optical receiving system of doppler wind lidar (DWL). According to the invention, two independent optical paths are employed; a fraction of lights, which are ejected by a laser, are collected by a first coupler; and the collected lights pass optical elements including a spectroscope and a reflective mirror and the like and then penetrate into a locking channel of a Fabry-Perot (FP) etalon; atmosphere backward dispersion lights are collected by a second coupler; the collected atmosphere backward dispersion lights pass the optical elements including the spectroscope and the reflective mirror and the like and then penetrate into two signal channels of the FP etalon. Because the optical signals of the locked channel is dispersion lights from a light-emitting window of the laser, so that optical light loss of signal channels is reduced. Moreover, the intensity of the portion of the dispersion lights is larger than the intensity of the atmosphere backward dispersion lights, so that a frequency locking efficiency is improved and a measurement precision of an atmospheric wind field can also be enhanced. Meanwhile, a caliber of the locking channel of the FP etalon can be reduced, so that processing cost of the FP etalon is substantially reduced; besides, the optical path system is simple, which is favor of adjustment of the optical path.

The invention provides an optical lens which comprises the following components that are successively arranged from an object side to an imaging surface: a first lens which has negative focal power and an object-side surface that is a convex surface and an image-side surface that is a recessed surface; a second lens which has negative focal power and an object-side surface that is a recessed surface; a third lens which has positive focal power and an object-side surface that is a convex surface; a fourth lens with positive focal power; a fifth lens which has positive focal power and an object-side surface and an image-side surface that are convex surfaces; a sixth lens which has negative focal power and an object-side surface and an image-side surface that are recessed surfaces; wherein the fifth lens and the sixth lens are adhered for obtaining a adhering member; and a seventh lens with positive focal power, wherein the optical lens further comprises a diaphragm between the second lens and the third lens. The optical lens provided by the invention at least has a wide-spectrum imaging function. The invention further provides imaging equipment.

A method and device for cold rolling and expanding processing of inner and outer spherical metal rings, relating to the technical field of bearing parts processing; what is to be solved is the technical problem of processing inner and outer spherical metal rings of bearing parts; the inner and outer spherical The method for processing metal rings includes the following steps: 1) steel reforming, wherein metal bars are transformed into rings; 2) material is softened, and the rings are subjected to heat treatment to obtain lower hardness so as to facilitate cold rolling; 3) cold rolling blanks Preparation, the ring is processed into a certain precision cold rolling blank by cutting; 4) cold rolling forming, the cold rolling process is performed, the outer circular concave groove of the rolling wheel and the outer cylindrical convex shape of the mandrel in the mold part The grooved shaft enables the workpiece to be formed, and the thrust surfaces of the supporting roller and the support wheel are used to stabilize the workpiece position and limit the axial movement of the workpiece. The invention has the characteristics of improving the mechanical properties of the ring parts, high production efficiency, good shape consistency of workpieces, high processing precision and high material utilization rate.

The invention discloses a U-shaped seamless nickel-chromium iron alloy heat transfer tube for a nuclear steam generator. The U-shaped seamless nickel-chromium iron alloy heat transfer tube comprises the chemical ingredients of no less than 58% of Ni, 28-31% of Cr, 8-11% of Fe, 0.01-0.03% of C, no more than 0.5% of Si, no more than 0.5% of Mn, no more than 0.01% of S, no more than 0.015% of P, no more than 0.05% of Cu, no more than 0.016% of Co, no more than 0.5% of Ti, no more than 0.5% of Al, no more than 0.1% of Nb, no more than 0.003% of B, and no more than 0.005% of N. The surface quality and the dimensional accuracy of a straight pipe are ensured by hot-extruded nickel-chromium-iron alloy tube blank via a plurality of cold-rolling deformation, online degreasing, pure-hydrogen protecting continuous bright heat treatment and vacuum heat treatment; and meanwhile, the U-shaped seamless tube for a steam generator, which is overlong, thin in wall, and is in semicircle transition at the elbow part, is manufactured by bending and forming by the principle of forming a circle by three points.

The invention provides a double-film refraction and reflection type co-detector imaging system, and belongs to the technical field of optics. The system comprises a primary mirror, a secondary mirror, a relay mirror group and a focal plane detector, wherein the primary mirror, the secondary mirror, the relay mirror group and the focal plane detector are placed sharing the same optical axis; the primary mirror and the secondary mirror are of a Cassegrain structure; the primary mirror is provided with a central hole, the secondary mirror is placed in front of the primary mirror, and the relay mirror group and the focal plane detector are placed at the back of the secondary mirror; the secondary mirror is a Mangin mirror, the front surface of the secondary mirror reflects medium wave infrareds and transmits long wave infrareds, and the back surface of the secondary mirror reflects long wave infrareds; arrangement of the two reflecting surfaces of the secondary mirror enables the medium wave infrareds and the long wave infrareds to be the same in optical distance so as to enable the medium wave infrareds and the long wave infrareds to be imaged on the same focal plane under the condition without focusing. The system can achieve two-waveband operation and imaging in a long focal distance and with a large relative aperture, and is compact in structure and little in distortion, a transfer function reaches or is close to a diffraction limit, and cold aperture matching reaches 100%.

A line spring jack and an assembling method are disclosed. The line spring jack comprises a jack body, a jack cap, a line spring wire and a positioning plug. Said jack body further comprises a plug hole; said line spring wire is located in said plug hole; said jack cap is connected to one end of said jack body; said jack cap further comprises a through hole connected to said plug hole; one end of line spring wire is clipped in a space formed between said jack cap and said jack body; wherein said plug hole further comprises a groove in the bottom; the caliber of the groove is smaller than the caliber of said plug hole; said positioning plug includes a part in the groove and a part in the plug hole, the part in the groove is tightly matched to said groove.

The invention relates to a wide distance beam parallelism detecting apparatus, comprising a photoelectric auto-collimator and a diameter-expanding collimating arm. The apparatus can detect the parallelism of the wide distance parallel beams and the detecting distance can reach 1.5m; and two parallel beams do not need to be contained into the caliber of the photoelectric auto-collimator so as to reduce the caliber of the photoelectric auto-collimator and largely reduce the manufacturing cost of the photoelectric auto-collimator. Simultaneously, the adoption of pentaprism and optical wedge largely reduces the processing precision requirement of the pentaprism and has no impact on the detecting precision of the whole apparatus and higher precision can be provided. The use of an optical splitting system in the photoelectric auto-collimator leads the detecting wave band of the apparatus to be expanded to the laser and infrared spectrum band from the white spectrum band so as to become a multi-spectrum optical system.

The present application relates to a prosthetic valve prosthesis with an anchor, includes a bracket body having a passage for supplying blood flow and at least one fixing member, the fixing member isconnected with the bracket body, the fixing member includes a lower extension section and an upper extension section, one end of the lower extension section is connected with the bracket body as a fixed end, the other end of the lower extension extends proximally along the axis of the bracket body, extending distally in the opposite direction after passing through the bent region and connected tothe upper extension. The upper extension section is located on the outer side of the lower extension section, and a leaf receiving cavity is formed between the lower extension section and the upper extension section. The fixing member is further provided with a lamination device, and when the fixing member is completely released, the self-body leaf is stacked in the leaf receiving cavity. The clamping force of the fixation part of the prosthetic valve prosthesis is not influenced by the space between the stent body and the fixation part, and the influence on the blood outflow channel after thestent body is released is greatly reduced.

The invention relates to the technical field of radio positioning, in particular to a millimeter-wave random biphase code phase-modulation and amplitude-modulation automotive collision-proof radar. Aquasi-optical integrated dielectric lens antenna and an array are arranged; a DSP scans wave beams lane by lane to guard against a target possible collided on a road surface; a broadband noise sourcegenerates two random code generators, a random code generator A modulates phase and measures distance / speed, and a random code generator B modulates amplitude, and performs transmitting / receiving conversion and back edge detection; double random code radio frequency is transmitted through an upconverter, an R / T3, a frequency multiplier and power amplifier, an R / T2, an isolator and an antenna; andback waves are transmitted to the DSP and an MCU for processing control through the antenna array, a beam switch, an isolator, an R / T1, a high frequency amplifier, a downconverter, an intermediate frequency amplifier, a random sequence asynchronous gate, a digital intermediate frequency quadrature detector I / Q and a digital pulse compression correlator. The radar ensures traffic flows in adjacentlanes run densely without mutual interference and operate in a coexisting way, has high electromagnetic compatibility EMC, inhibits false-alarm and determines the position, distance and relative speedof a target through the DSP, displays three-dimensional images and identifies a target closest to the automobile through a CRT, performs the audible and visual alarm if the distance of the target issmaller than a safety distance, intelligently avoids a barrier or reduces speed or brakes if the distance of the target is approximate to a danger distance, and controls and references a road condition to combine the speed of the automobile and the current position information on a GPS to make a choice, thereby obviously improving the running safety of the automobile.

A device for enhancing the power density of a focal spot of a large light-spot laser system comprises a large light-spot laser system laser source, a deformation mirror, a reflection mirror, a wave front measuring instrument, an off-axis parabolic mirror, CCD array detectors and a computer, and is characterized in that the reflection light path of the off-axis parabolic mirror is provided with the deformation mirror which is a small-caliber deformation mirror, the reflection light path of the deformation mirror is sequentially provided with the reflection mirror and the wave front measuring instrument, the reflection light path of the reflection mirror and the focal plane of the off-axis parabolic mirror are provided with the CCD array detectors, the output end of the wave front measuring instrument is connected with the input end of the computer and the output end of the computer is connected with the control end of the deformation mirror. The device self-adaptively enhances the power density of the focal spot of the large light-spot laser system by using the small-caliber deformation mirror and is characterized by low price, simpleness and high efficiency.

The invention discloses a large-zoom-ratio zooming laser illuminator. A first lens set is fixed. A second lens set and a third lens set can move. In the zooming process of the laser illuminator, light beams sequentially pass through the first lens set to be converged, then passes through the second lens set to be diffused and finally passes through the third lens set to be converged. The divergence angle of the light beams passing through the first lens set can be regulated by regulating the distance between the first lens set and an optical fiber end face, beam expanding can be further conducted on the divergence angle by regulating the distance between the second lens set and the first lens set, and therefore 66 or more times of focal length changes are achieved, high transmittance, high light passing quantity and easy assembly performance of the zooming laser illuminator are ensured, and the high light passing quantity of F1.8 can be achieved. The second lens set and the third lens set are quite smaller than the first lens set, and a user only needs to select a motor with small driving capacity. The first lens set which is fixed is equivalent to a device, similar to a glass window, of the zooming illuminator, and therefore the zooming illuminator can be well protected while dust is prevented from entering the large-zoom-ratio zooming laser illuminator.

The invention provides an optical lens. The optical lens sequentially comprises a first lens, a diaphragm and a rear lens group from an object space to an image space, wherein the first lens has positive focal power and is of a crescent shape; the rear lens group has positive focal power; the group comprises a second lens, a third lens, a fourth lens and a fifth lens; the second lens has negative focal power and is of a double concave shape; the third lens has positive focal power; the fourth lens and the fifth lens are combined to form a balsaming lens; the ratio of the optical length of the optical lens to the whole group of focal length values is not greater than 2.3. Light is collected and converged from a large angle by the first lens with the positive focal power and the crescent shape, so that the caliber of the second lens is reduced; the light emitted by the first lens is diverged by the second lens with the negative focal power and the double concave shape, so that the caliber of the third lens is reduced and the distance between the second lens and the third lens is reduced on the premise that the imaging requirement is met; the light emitted by the second lens is converged by the third lens with the positive focal power, so that the caliber of the balsaming lens is reduced, further the optical length and the caliber of the optical lens are reduced, and the miniaturization is realized.

The invention relates to a standard starlight simulator and a stray light PST (point source transmittance) optical detection system containing the same. The standard starlight simulator comprises a light source, an iris diaphragm, a dodging instrument, a star point plate and a collimation system; the iris diaphragm is arranged on the incident optical path of the light source; the dodging instrument is arranged on the output optical path of the iris diaphragm; the star point plate is arranged above the dodging instrument; and the collimation system is arranged on the output optical path of the star point plate. The invention provides the standard starlight simulator which can greatly enlarge the range of the simulated stellar magnitude and realize accurate measuring and calibrating under pianissimo light environment and has high measurement accuracy, and the stray light PST (point source transmittance) optical detection system containing the simulator.

The invention discloses a super-large-aperture wide-angle lens of a single lens reflex camera.The super-large-aperture wide-angle lens comprises an optical lens which sequentially comprises 11 lenses from the object side to the image side; the first lens has negative power, and the object side face of the first lens is a convex face; the second lens has negative power, and the object side face of the second lens is a concave face; the third lens has positive power, and the object side face of the third lens is a plane; the fourth lens has positive power, and the object side face of the fourth lens is a convex face; the fifth lens has positive power, and the object side face of the fifth lens is a convex face; the sixth lens has negative power, and the object side face of the sixth lens is a convex face; the seventh lens has negative power, and the object side face of the seventh lens is a concave face; the eighth lens has positive power, and the object side face of the eighth lens is a convex face; the ninth lens has positive power, and the object side face of the ninth lens is a convex face; the tenth lens has negative power, and the object side face of the tenth lens is a convex face; the eleventh lens has positive power, and the object side face of the eleventh lens is a convex face.The super-large-aperture wide-angle lens of the single lens reflex camera can correct various aberrations and is compact in structure, good in imaging effect, long in back focal length, low in cost and high in cost performance ratio.

The invention relates to an optical system, and discloses a compact type medium wave infrared dual-viewing-field optical system. The compact type medium wave infrared dual-viewing-field optical system comprises a front set lens and a rear set lens. The front set lens comprises a first lens (1). The rear set lens comprises a second lens (2) and a third lens (3). The first lens (1) is a positive lens. The second lens (2) is a negative lens. The third lens (3) is a positive lens. According to the rear set lens of the telephoto optical system, the negative lens (germanium) and the positive lens (silicon) are combined. After the combination, a chromatic value of the rear set lens is larger. Chromatic aberration generated by the front set lens of the telephoto system can be eliminated. The diameter of the rear set lens is greatly compressed. The weight of the lenses is reduced. According to the fact that the medium wave infrared dual-viewing-field refrigerating optical system is designed, a shoot-in and shoot-out mode is adopted, the effect of zoom of the viewing field is achieved, a structure is compact, weight is light, and manufacturability is good.

The invention discloses a basic structure of a fish-eye lens with a viewing angle of 240 degrees. The fish-eye lens comprises seven lens groups which are combined by ten lenses. By adopting the form of the structure, the viewing angle of the fish-eye lens which is composed of spherical surfaces is creatively raised to 240 degrees and the limiting aperture which can reach F / 1.4 to the maximum extent is kept and the other performances do not be reduced. As an overlarge viewing angle, a relatively big aperture, a supersized retrofocus ratio and an excellent image fault matching are adopted, therefore, single lens reflex, super viewing angle, and approximately all airspace, maritime-space and municipal shooting and monitoring can be realized in a plurality of fields, equidistant projection and showing of images, the shape change of which can be controlled, in an IMAX dome which is appropriate to the whole globe, and clear and bright images can be ensured. Meanwhile, the structure is compact, and the disadvantage of negative thickness of the edge of the lens is successfully eliminated; the fish-eye lens is easy to be processed and extremely has practical significance.

The invention relates to a long-wave long-focus uncooled thermalization-free infrared optical system, belonging to the technical field of optics. The optical system comprises an aperture diaphragm, a first lens, a second lens, a third lens and a fourth lens which are sequentially and axially arranged along a light incident direction, wherein the first lens, the second lens and the third lens forma converging group used for correcting primary aberration, the lenses are in a positive-negative-negative-positive symmetrical structure, the first face of the second lens is a rotating and symmetrical diffractive face, and thermal expansion coefficients of the optical elements and the structural materials of the four lens and the intervals and the curvature radii of the four lenses all satisfy aformula. By utilizing different temperature characteristics and linear expansion coefficients of various optical materials and combining with a lens cone material, the self adaptation to the environment is realized to realize a thermalization-free function, which can effectively simplify the structure of an optical machine, reduce system weight, shorten system volume and improve the imaging quality of the optical system in different temperature environments.

The present invention provides an instant heating drinking machine which can provide needed drinking hot water instantly and needs not pre-store hot water in machine. The drinking machine in the invention includes shell, bottle seat, bucket, heating body, channel water pipes, water discharging valve and water outlet, the heating body consists of many electrothermal tubes which are parallel each other and can allow water flows, the electrothermal tube is flat, the width of short edge of electrothermal tube inner cavity is 1. 0-2. 0mm and the width of long edge is 5-10 mm, one end of the electrothermal tubes are fixed on the water inlet variable flow seat and another ends are fixed on the water outlet variable flow seat, the energizing and heating of heating body is controlled by the water discharging valve. The drinking machine in the invention need not preheating device, ensure the first cup of water is hot water, and the heating or not is controlled by the water discharge valve individually, it can realize the purpose of instant and continuous hot water supply and instant drinking at the time of starting the machine.

A wideband dual-polarized radiation element includes two pairs of cross polarized dipoles (11,12,13,14) and baluns (21,22,23,24), which correspondingly feed current to each dipole in balanced manner. Each dipole includes a pair of unit arms (11a and 11b, 12a and 12b, 13a and 13b, 14a and 14b) aligned on top of the corresponding balun. One end of each unit arm is connected on top of the balun, and the other end of one unit arm is bending inwards to form inward loaded line (61a, 62a, 63a, 64a), and the other unit arm is bending downwards to form downward loaded line(61b, 62b, 63b, 64b). An antenna (10) includes a metal reflector (20) and at least one wideband dual polarized radiation element, which has excellent radiation and polarization performance.

The invention relates to a small-caliber artificial blood vessel with the surface grafted with a heparin coating and a preparation method of the small-caliber artificial blood vessel. A small-caliberblood vessel is adopted as a substrate. The preparation method comprises the following steps: soaking the surface of the substrate in a dopamine solution for reaction, coating the surface of the substrate with multiple layers of polydopamine coatings, performing chemical bond combination grafting with polyethyleneimine, and finally activating heparin by utilizing 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC) and N-hydroxysuccinimide (NHS) to obtain the heparinized surface through amido bond combination. The invention has the characteristics of small caliber, favorable mechanical properties, hydrophilicity and long-acting anticoagulation; the preparation method is environmentally friendly and efficient in compounding, the prepared heparin coating is uniform, the grafting amount of heparin is higher and can reach 4.9 mu g / cm < 2 >, and good market application prospects are achieved.

The invention provides a low-frequency radiation unit. The low-frequency radiation unit comprises a dielectric substrate, a radiator and a feed balun, wherein the radiator comprises two dipoles whichare orthogonally distributed, radiation arms of the two dipoles are respectively composed of a vertical line and a horizontal line and jointly form a cross-shaped line, the tail ends of the vertical line and the horizontal line are connected through an arc line, and a plurality of sections of bent lines are arranged in the middle of the arc line; and the feed balun is of an orthogonal structure, the bottom of the feed balun is connected with a feed network, and the top of the feed balun is connected with the radiator. The invention also provides a base station antenna. The base station antennais formed by nesting and inserting a plurality of low-frequency radiation units into the middles of a plurality of high-frequency radiation units. Therefore, the low-frequency radiation unit has a filtering function, the influence of the low-frequency radiation unit on the high-frequency radiation performance can be effectively reduced when the high-frequency antenna and the low-frequency antennaare nested to form an array, and the miniaturization of the antenna size can be realized.

The invention discloses a portable double-offset-parabola antenna which comprises a main reflecting face, an auxiliary reflecting face, a main-reflecting-face supporting device, an auxiliary-reflecting-face fixing device, a feed source system, a feed source supporting device and a servo motor. The main reflecting face is fixed to the main-reflecting-face supporting device, the auxiliary reflecting face is fixed to the main-reflecting-face supporting device through the auxiliary-reflecting-face fixing device, the servo motor is fixed to the position below the main-reflecting-face supporting device, the feed source system is fixed to the main-reflecting-face supporting device through the feed source supporting device, and the main reflecting face is of a transverse elliptic structure, that is, the width of the main reflecting face is larger than the height of the main reflecting face. Compared with an existing Gregory antenna, the performance of the antenna is guaranteed; meanwhile, the portable double-offset-parabola antenna has the advantages that the focal length is small, the caliber is small, a feed source is small, and the performance is excellent; the portable double-offset-parabola antenna has the structural advantages of being simple in structure, light in weight, easy to machine and low in cost.

The invention discloses a technology of cleaning a micro container with a large length-diameter ratio, and particularly relates to an NMR (nuclear magnetic resonance) tube cleaning device system. TheNMR tube cleaning device system can effectively reduce labor force and rapidly and efficiently clean an NMR tube, and is particularly applicable to the NMR tube containing tar residues. An organic solvent is not required for the device system. The device system comprises an NMR tube bracket, an NMR tube storage support, a washing array, a hot water tank, a rinsing tank, a cleaning agent pump, a deionized water booster pump, an air pump, an electrically heated drying cabinet and a control system.

The invention belongs to the mobile communication antenna technical field and discloses a broadband radiating unit and an antenna. The broadband radiating unit includes a base, baluns, dipoles, and feeding sheets; one end of each of four baluns is fixed on the base; each balun includes two supporting columns arranged in parallel and adjacent to each other; each dipole includes two radiating arms that are symmetrically fixed on two supporting columns respectively; the baluns, dipoles, and base form a radiating unit main body; the feeding sheets are located at the intersections of the baluns andthe dipoles and are not higher than the radiating surfaces of the dipoles; and the feeding sheets and the radiating unit main body are integrated. The antenna includes a metal reflection plate and atleast one broadband radiating unit disposed on the metal reflection plate. With the broadband radiating unit and the antenna of the invention adopted, the problems of little possibility of meeting electrical performance requirements, large size, heavy weight, complicated assembly and poor reliability of an broadband radiating unit and an antenna in the prior art can be solved. The broadband radiating unit and the antenna of the invention have the advantages of simple processing, high reliability, miniaturization, light weight and excellent electric performance.

The invention discloses a high-definition panoramic looking-around optical imaging system. The high-definition panoramic looking-around optical imaging system is provided with a front lens set, a diaphragm, a rear lens set, an optical filter and protective glass in sequence from an object plane to an image plane, wherein the focal power of the front lens set is negative; the front lens set comprises a first lens, a second lens and a third lens; the focal power of the first lens and the second lens is negative and the focal power of the third lens is positive; the focal power of the rear lens set is positive; the rear lens set comprises a fourth lens, a fifth lens and a sixth lens; and the focal power of the fourth lens and the sixth lens is positive and the focal power of the fifth lens is negative. By adopting the high-definition panoramic looking-around optical imaging system disclosed by the invention, a high-definition camera lens with an ultra wide angle, a large relative pore diameter and mega pixels and with the maximum view field angle of 230 degrees can be used in the aspects of three-dimensional reconstruction, panoramic browsing video monitoring, dome-screen projection and the like; and the imaging system still has relatively high definition in a temperature range from -40 DEG C to +85 DEG C and is especially applicable to a bad vehicle-mounted environment.