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.

A beam is provided for intraluminal devices. The beam is defined by a first side surface and a second side surface. The first side surface is tapered at a different rate than the second side surface. One advantage of the beam is that strain which is normally concentrated in adjacent, interconnected bends is redirected onto the length of the beam. This may increase the fatigue life of intraluminal devices or may be used to fashion new structures with improved performance.

A strut, or beam, is provided for intraluminal devices. Strain which is introduced into a stent or other intraluminal device is distributed more evenly along the length of the improved strut by maintaining a substantially constant strain level along the length of an end portion. This may increase fatigue life or improve the performance of devices using the improved strut. The strain along the length of the end portion may be maintained substantially constant by varying a section property of the strut, including the width, thickness, cross-sectional area, material property or other characteristic of the end portion.

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.

The invention relates to an illuminating beam shaping system, in particular to an illuminating beam shaping system which can achieve uniform illuminating brightness on the emergent surface of an illuminating system. In the invention, a splitting device is used, and all beams from a laser chip are sequentially subject to a pre-positioned splitting means and a post-positioned diffusion means, so that uniform illuminating brightness can be achieved on the optical irradiation surface of the system. The splitting device comprises array type curved lenses, the input side of the splitting device is aligned within the range of the included angle of emergent beams from the laser chip, the beams can be converted into multi-array tapered beams at the output side of the splitting device in accordance with different arrangement positions and refraction angles of the lenses, and the tapered-bottom practical optical surface of each tapered beam acts on a optical diffusion assembly and is subject to refraction and diffusion, so that a uniform illuminating brightness can be achieved on the emergent surface of the system.

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.

A beam is provided for intraluminal devices. The beam is defined by a first side surface and a second side surface. The first side surface is tapered at a different rate than the second side surface. One advantage of the beam is that strain which is normally concentrated in adjacent, interconnected bends is redirected onto the length of the beam. This may increase the fatigue life of intraluminal devices or may be used to fashion new structures with improved performance.

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 method for calculating dynamic response at tail ends of central rigid body-FGM tapered beam systems. The method comprises the following steps of: describing a geometric displacement relationship of a flexible FGM beam by using an arc length coordinate, and respectively describing transverse bending, longitudinal tensile deformation and a shear angle of the flexible beam by using a dip angle and a tensile strain variable; discretizing a deformation field by adoption of an assumed mode method, and carrying out equation deduction by using a second-type Lagrange equationso as to obtain a rigid-flexible coupled dynamic model of a central rigid body-FGM tapered beam system; compiling an FGM beam tail end response calculation program by using C++, and obtaining a changevalue of the beam system tail end response along with a large-scale rotation time through reading parameters such as geometric parameters, function gradient functions and material components of the central rigid body-FGM tapered beam system. By adoption of the method, the calculation precision and efficiency are relatively high.

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 beamtraveling 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.

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 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 present invention relates to a computer tomography method and a computer tomography (CT) apparatus, wherein: a) an object is scanned with a cone-shaped ray beam emitted from a focal point, and a matrix detection An array of detectors detects the beam of rays, for which the focal point moves relative to the object on a helical trajectory, the central axis of which corresponds to the axis of the system, wherein the array of detectors outputs output data corresponding to the received rays, b) An image with an inclined image plane is reproduced from the output data provided during the movement of the focal point on the helical track, wherein the image plane is inclined with respect to the system axis by an inclination angle γ to a first axis intersecting at right angles to the system axis, and to both A second axis which intersects the first axis at right angles to the system axis is inclined by an inclination δ.

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.

The invention discloses a method for transforming X-ray cone beam data (line integration through an object) into Radon data (half-division integration) 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 line of intersection of a pair of corresponding integration planes rotated relative to each other by an angle δβ and the normalized detector plane, and the difference between the weighted line integrals is divided by the rotation angle δβ. This method transforms cone beam data to represent the value of the plane integral over any set of planes in Radon space, such as a set of coaxial vertical planes.

The invention relates to a method for improving the resolution of cone beam SPECT imaging by using eccentric rotation, comprising the following steps: step 1, obtaining low-resolution projection images at N rotation angles, and obtaining several low-resolution images at each rotation angle Ratio projection image, the acquisition of the low-resolution projection image will ensure that the detector focus is always the same point, there is a geometric relationship between the low-resolution projection image and the high-resolution projection image under this rotation angle; Step 2, for Several low-resolution projection images under a single rotation angle are processed to obtain the corresponding high-resolution projection images under the rotation angle; step 3, repeat step 2 to obtain high-resolution projection images under N rotation angles, and finally obtain the real High resolution images. The invention can improve the resolution of the cone-beam SPECT image without changing the hardware of the detector.

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.

The present invention relates to the technical field of flame temperature measurement, and more specifically, provides a flame temperature field measurement device and method based on projected background schlieren technology, using the projected background schlieren technology, based on the principle of air refractive index gradient measurement, Using a semiconductor laser as the light source, the laser beam is shaped into a conical beam by a beam expander, and then divided into two beams by a beam splitter. The reflected beam irradiates the convex lens and enters the test area. The light is disturbed by the change of the refractive index of the flow field. The schlieren image can be directly presented on the projection light screen, realizing the projection visualization of the background schlieren. Then use high-speed CCD fast imaging, combine S-EYE and PIV technology on the PC side to obtain the offset of the particles on the image to quantify the deflection angle, and then use the back-projection reconstruction principle to perform three-dimensional reconstruction of the uneven temperature field to obtain the entire flame area The temperature change trend can realize the visual measurement of the transient flame temperature field, replacing the traditional single-point temperature measurement.

An electronic device (10) comprising: a display screen (12), used to display data stored in the electronic device (10); an input device (16); a detection device (20), used to detect the input device (16) a three-dimensional position relative to the device (10); and a control device for controlling the display on the display screen (12) according to the three-dimensional position of the input device (16) relative to the device (10) ) on the data. The input device (16) includes a source of electromagnetic radiation directing a cone-shaped beam of infrared rays towards the display screen (12). The detection device (20) can detect the elliptical eccentricity of the electromagnetic radiation incident on the display screen (12) to determine the angle at which the electromagnetic radiation is irradiated on the display screen (12), and can detect the incident The area of ​​electromagnetic radiation on the display screen (12) determines the distance between the input device (16) and the display screen (12).