41 results about "Tapered beam" patented technology

The invention discloses an improved eliminating method of tapered beam CT reconstruction image annular false shade, comprising the steps as follows: the invention changes the annular false shade of reading CT reconstruction image into a straight line through a method of coordinate change, then takes a one-dimension filter parallel with the false shade as a mask to search a middle image regularly line by line and acquire sample space, at the same time calculates out the variance about the pixel value of each sample space, acknowledges the false shade according to whether the variance is less than the preset valve value, substitutes the pixel value of each sample space with the average pixel value between the point and two upper and lower false shades in the ordinate axis direction in order to eliminate the annular false shade, and finally changes the middle image free from the false shade to be under the original frame of axes to gain a corrected image.

The invention discloses a method for realizing laser focusing, which utilizes reflection of a reflector and focusing of a focus lens to exchange an inner position and an outer position of a light spot of a laser beam in rings along the radial direction and to focalize. The method is characterized by comprising the following steps: the laser beam is reflected to a turbinate annular beam; the turbinate annular beam is converted into an annular beam; the annular beam is focused, so as to form an annular conical beam, and a hollow conical dark area is formed in the middle of the annular conical beam, thus obtaining a focusing spot of hollow annular light. The method solves the defects of laser focusing in the prior art and obtains a focusing spot with strong light encompassing weak light, almost uniform energy distribution and small gradient, thus improving the processing effect.

The invention discloses an emergency processing method for tunnel working face collapse. Two arched beams are continuously supported by single-body hydraulic supporting columns on the safe section, and I-steel tapered beams are placed on the arched beams and are ejected in the working surface of the collapse area; carriers are placed on the upper portions of the I-steel tapered beams of the collapse section, and the height is of the carriers is made to be slightly larger than that of a grating steel frame for preliminary support; a waterproof metal grating carrier is horizontally placed above the carriers, and concrete is pumped through a concrete pumping pipe; the concrete pumping pipe, a concrete height detection pipe and an exhaust pipe are detached ;the carriers close to the safe section are detached and cut after concrete solidification is completed, and preliminary support is rapidly conducted on the collapse section; and therefore the collapse section is rapidly and effectively supported, the defects of tunnel collapse emergency processing apparatuses frequently used at present are overcome, the emergency processing requirements of tunnel collapse are better met, and construction conditions are provided for subsequent tunnel collapse processing.

The invention discloses a sea ice calculating method of using a marine navigation simulator to simulate a ship-ice interaction process. The sea ice calculation is divided into an ice breaking calculation module and a rigid body motion module according to current sea condition information, and sea ice force, sea ice brash ice shapes, and sea ice motion states during an ice breaking process are calculated and analyzed, and then generated results are transmitted to a ship motion model and an ice area visual system. The sea ice calculating method is used to fill in the blank of the sea ice calculating method of the marine navigation simulator, and a semi-infinite plane elastic foundation theory, a tapered beam structure, and an energy conservation theory are used in the corresponding modules, and then brash ice forming conditions, brash ice bending stress, and brash ice energy distribution and motion states are calculated. Sea ice physical characteristics are well displayed in the ice area simulation visual system of the marine navigation simulator, and the sea ice calculating method is used as a physical foundation of ship-ice interaction process visualization, the ice breaking process is dynamically and vividly simulated, and then reliable sea ice stress feedback is provided for a ship motion model.

A method and device for laser cladding by independently heating the cladding material and the surface of the workpiece consist in formation of the series of parallel annular laser beams, possibly different wavelengths, with an adjustable distribution of laser radiation power across the annular beams. The annular beams are transformed into a series of conical beams which are separately focused along a single optical axis, along which the cladding material is fed. The device can be supplemented with a cylindrical mirror for the multipass laser radiation through the stream of cladding material with the possibility of the laser radiation return to the laser resonator.

A nuclear fuel assembly having a plurality of multi-leaf hold down spring sets extending from a top nozzle. Each spring set consists of a multiple number of springs leafs in order to provide a large working range of spring deflection. Each spring leaf has a straight, flat base section followed by a straight, flat tapered beam with a secondary spring set having a curvature at its peripheral end.

Disclosed are an apparatus of converting a laser beam traveling straight to a beam propagated in all directions and a security system using the laser beam propagated in all directions. The laser beam traveling straight is incident on a cylindrical prism and repeatedly reflected and transmitted to be converted to the laser beam propagated in all directions. The laser beam is converted to a plane beam or a conical beam by controlling an incident angle of the laser beam incident on the cylindrical prism. The security system is constructed using the apparatus of generating the plane, beam or conical beam.

The present invention discloses a method for transforming X-ray cone beam data (line integration through an object) into Radon data (half integral) for reconstructing three-dimensional CT images through inverse Radon transformation. The radial derivatives of the plane integrals are found by integrating along each of a pair of straight lines on the normalized detector plane, defined as sharing a common axis of rotation and The intersection of a pair of corresponding integration planes rotated relative to each other by an angle δβ and the normalized detector plane, and then divide the difference between the weighted line integrals by the rotation angle δβ. This method can transform the cone beam data to represent the plane integral value on any set of planes in Radon space, such as a set of coaxial vertical planes.

Embodiments of the present invention are directed to systems and methods for trapping and holding airborne particles, for further measurement and characterization. In the various embodiments, an optical trap is provided which generates and uses dual hollow conical beams to trap and hold absorbing and non-absorbing, spherical and irregularly shaped, liquid and solid airborne particles. The optical trap may include: a light source for generating a beam of light; optics for shaping and forming a hollow conical beam having a ring geometry from the beam of light; a trapping region where a particle can be present to be trapped; a first parabolic reflector configured to focus an inner portion of the hollow conical beam to a first focal point in the trapping region; and a second parabolic reflector configured to focus an outer portion of the hollow conical beam to a second focal point in the trapping region.

The invention discloses a high color development laser illumination system for non-excited phosphors. The high color development laser illumination system for the non-excited phosphors comprises a redsemiconductor laser coupled and conducted by optical fibers (including fused tapered beam or bundled beam), a green semiconductor laser coupled and conducted by optical fibers, a blue semiconductor laser coupled and conducted by optical fibers, a beam optical fiber and an integrator rod. The red, green and blue semiconductor lasers can be fused and tapered to form a beam, or can be bundled and seamed into the seam optical fiber to obtain white light output, and then is subjected to dodging and shaping by the integrator rod to obtain high-power and high-color white light for the laser illumination system. The method solves the problem of low efficiency of a blue light excitation phosphor method. Under the condition of high-power laser, the efficiency of the phosphor does not decrease due to the thermal quenching effect, so that the efficiency and stability of the illumination system are improved.

Double-buffering forced reset explosion doors of an inclined well and a horizontal well relate to ventilating safety facilities of coal mines and resolve the problem that existing explosion doors are easy to damage and cannot be reset. The double-buffering forced reset explosion doors of the inclined well and the horizontal well are characterized in that a plurality of gas springs are embedded in the two doors, and a plurality of foamed aluminum buffer devices are further arranged on the two doors. A pin shaft locking mechanism is arranged between a frame and the two doors, and a pin shaft of the pin shaft locking mechanism has the effect of a safety pin. Gear synchronous mechanisms of the two doors are arranged on a rotating shaft. A tapered beam is arranged on the frame. The double-buffering forced reset explosion doors are used for the inclined well and the horizontal well of the coal mines and have a double-buffering forced reset function.

The invention provides an optical fiber beam combining structure. The optical fiber beam combining structure comprises a central optical fiber, a plurality of input optical fibers and a beam combiningcoupling and device, the beam combining and coupling device is composed of two parts, the centers of the two parts are respectively provided with a through semicircular hole, the two through semicircular holes are combined to form a through hole penetrating through the beam combining and coupling device, and the size of the through hole is matched with the size of the inner cladding of the central optical fiber; the beam combining and coupling device is sleeved on the outer surface of the inner cladding of the middle section of the central optical fiber through the through hole and is fixedlyconnected in a sintering manner; and the plurality of input optical fibers are arranged in parallel with the central optical fiber, tightly surround the central optical fiber for a circle, and are vertically welded with the pumping energy input surface in a tapering-free manner. The invention further provides a manufacturing method of the optical fiber beam combining structure and a laser. According to the invention, the tapered beam combining and coupling device is adopted, so that the shape damage caused by directly tapering a plurality of input optical fibers is avoided, and the optical fiber transmission performance is improved.

The invention provides a compact compliant orthogonal displacement amplification mechanism whose gain increases with the input force, including a rigid input end for the input force, a left rigid output end, a right rigid output end, a left variable section beam, and a right variable section beam , the left undetermined equal straight beam and the right undetermined equal straight beam; the left variable cross-section beam, the left rigid output end and the left undetermined equal straight beam are connected sequentially, and the end of the left variable cross section beam far away from the left rigid output end is connected with the lower surface of the rigid input end; The variable cross-section beam, the right rigid output end and the right undetermined straight beam are connected sequentially, and the end of the right variable cross-section beam far away from the right rigid output end is connected to the lower end face of the rigid input end; the left variable cross-section beam, the left rigid output end and the left undetermined equal straight beam It is mirror-symmetrically arranged with the right variable cross-section beam, the right rigid output end and the right undetermined equal straight beam along the central axis of the rigid input end. The mechanism of the invention can realize orthogonal displacement conversion and displacement amplification under the action of unidirectional input force, and has the advantage that the mechanism gain increases with the input force.

The invention discloses a tapered beam CT (computed tomography) imaging system based on an attenuation plate. The attenuation plate is arranged between an imaging target and a flat panel detector to block most of scattered rays from an imaging target, and enough principal rays are allowed to pass. The scattered rays from the attenuation plate in a projected image are calculated and removed from the projected image, so that interference caused by the scattered rays is reduced, and a clear reconstructed image is acquired.

A volume cone beam CT scan is performed using a cone beam CTX ray source (20) and an offset flat panel x-ray detector (22) during nuclear (eg SPECT or PET) and CT scans of a patient. The field of view of the X-ray source overlaps the field of view of the two nuclear detector heads (18), and the offset of the X-ray detector (22) is such that there is no difference between the movement of the nuclear detector heads around the rotatable gantry (16). interference is minimized. Additionally, the locking mechanism (80) provides automatic locking of the X-ray detector (22) in each of the stowed and working positions, improving safety and CT image quality.