52results about How to "Guaranteed imaging accuracy" patented technology

The invention relates to an ultrasonic CT imaging system based on an improved ray tracing method. The ultrasonic CT imaging system comprises a full-enclosed ultrasonic transducer, a signal acquisitionmodule and a data processing and imaging module. When a processor in the data processing and imaging module executes computer programs stored in a memory, an implementation method comprises the following steps that human organs are scanned based on the full-enclosed ultrasonic transducer, and the transit time of sound waves is measured; the initial sound velocity distribution of a target is reconstructed; B-mode ultrasound imaging is conducted based on the sound velocity distribution of the target; the boundary information of organic tissues is extracted from B-mode ultrasound images; propagation paths of the sound waves are updated iteratively; and the sound velocity distribution of the target is updated iteratively. Compared with a traditional imaging scheme, while the ultrasonic CT imaging accuracy is ensured, the calculation amount is reduced, the reconstruction speed is improved, and the accuracy of the B-mode ultrasound images and the edge definition in an ultrasonic CT imagingresult are improved.

The invention discloses an optical projection tomography method based on a helical scanning track. The projection data obtained by an optical projection tomography (OPT) system in a helical scanning manner is rearranged to be transformed to a series of sinusoidal projection images scanned in a circular track, and the sinusoidal projection images are reconstructed, so as to obtain a sample three-dimensional fault structure. The optical projection tomography method provided in the embodiment of the invention can be used for effectively expanding the view of the optical projection tomography, in particular to the imaging view for long and thin objects.

The invention provides a dimmable aperture device, which comprises a first ring, a dimming ring, a second ring, a plurality of leads, a light shielding film, a plurality of positioning screws and a plurality of adjusting screws. Characterized in that the light-shielding film is a cylindrical, light-opaque elastic film; The first ring and the second ring are coaxially fixed together, and both end faces of the light shielding film are fixed respectively; The dimming ring is coaxially arranged between the first ring and the second ring and is rotatable about the axis; One end of each lead wire isfixed on the first ring by a positioning screw, the other end is wound around the outer wall of the light shielding film, and is fixed on the dimming ring by an adjusting screw; All the leads are equally spaced along the circumference of the outer wall of the light-shielding film, and the outer wall of the light-shielding film is constrained to form an approximately circular aperture. The dimmingring rotates relative to the first ring to pull the lead wire and the outer wall of the light shielding film, thereby enlarging and reducing the aperture. The invention has the advantages that the aperture is approximately circular under various apertures, and the aperture can be continuously adjusted in size.

The invention discloses a high precision machining apparatus used for an electronic equipment outer shell. The high precision machining apparatus used for the electronic equipment outer shell comprises a feeding supporting seat, a polishing supporting seat, a plurality of mechanical arms, a polishing head and a material conveying clamping fixture, the polishing head and the material conveying clamping fixture are correspondingly connected with the tail end nodes of the mechanical arms in an installing mode, the feeding supporting seat and the polishing supporting seat are arranged in the circumferential direction of the mechanical arms, the feeding supporting seat comprises a supporting frame and a feeding table installed on the supporting frame, the tail-end nodes of the mechanical arms are connected with an installing seat, the polishing head and the material conveying clamping fixture are installed on the installing seat, an air outlet communicates with a second cavity body, the lower end of a core body is connected with a rotating shell, the central axes of the installing seat, a bearing and a rotating head coincide, and the central axis of the rotating head does not coincide with the central axis of the core body. According to the high precision machining apparatus used for the electronic equipment outer shell, vacuum adsorption of a workpiece is realized through an adsorption hole and an adsorption line groove, the accurate position and stability of the workpiece are ensured in the polishing process, the situations of offset and the like in the polishing process are avoided, and the polishing accuracy and stability are ensured.

The invention discloses a high-precision automatic polishing machine. The high-precision automatic polishing machine comprises a material loading support seat, polishing support seats, a plurality ofmechanical arms, polishing heads and material conveying fixtures, wherein the polishing heads and the material conveying fixtures are installed and connected to tail end joint points of the mechanicalarms correspondingly, the material loading support seat and the polishing support seats are arranged in the circumferential direction of the mechanical arms correspondingly, the material conveying fixtures are suction cup mechanisms, the suction cup mechanisms comprise installation plates and a plurality of suction cups connected to the corresponding installation plates, each polishing head comprises an outer shell body, an inner shell body, a core body and a rotating head, the inner shell body is located inside the corresponding outer shell body, the core body is rotatably arranged inside the corresponding inner shell body, the rotating head is installed and connected to the corresponding core body, each polishing head is further provided with an air pipe installation seat installed to the corresponding outer shell body, and each air pipe installation seat comprises an air inlet portion and an air outlet portion. According to the high-precision automatic polishing machine, by means of the arrangements of rubber rings, sealing pad rings and pad pieces, the sealing effect of the lower portions of the polishing heads is enhanced layer by layer, water vapor and liquid can be effectively prevented from entering the shell bodies, components inside the shell bodies are protected, and the service life of the high-precision automatic polishing machine is prolonged.

The invention relates to an earthquake prestack migration imaging method which includes the following steps: (1) obtaining observing system information and data features by scanning earthquake records, and calculating to obtain migration initial parameters; (2) launching gauss beam central ray from a cannon point, and calculating travel time and amplitude weighting factors in a nearby area of the ray; (3) launching ray from all gauss beam central positions of a demodulator probe wave field, and calculating travel time and amplitude weighting factors in a nearby area of the ray; (4) by using the travel time and the amplitude weighting factors of the gauss beam at the cannon point and the gauss beam at the demodulator probe position to a certain underground point, the earthquake record is returned to the position according to travel time information and amplitude weighting factor information; (5) repeating the step (1) to the step (4) for each cannon earthquake record, migration results of all canons are obtained and stacked according to corresponding positions to obtain a migration stacking result of a cannon set, and a final migration result is obtained by filtering false appearances on a wave field path. The earthquake prestack migration imaging method can obtain migration imaging in a key target area fast and can be widely applied to various oil gas exploration processes.

The invention relates to a full-automatic quality detection device of a micro drill point for drilling a PCB in the technical field of tool detection, which comprises a feeding mechanism, a rotary worktable, a micro drill rotary mechanism, a height adjusting mechanism, a vision detection device and a discharging mechanism, wherein the feeding mechanism, the rotary worktable and the discharging mechanism are respectively and correspondingly arranged at a feeding station, a rotary station and a discharging station of a working platform, the micro drill rotary mechanism and the height adjusting mechanism are sequentially arranged at the side face of the rotary table, the vision detection device is arranged at a vision detection station of the working platform, the feeding station and the rotary station are arranged at the same side, the discharging station and the feeding station are positioned at two ends of the working platform, and the vision detection station and the discharging station are positioned at the same side. The micro drill rotary mechanism and the height adjusting mechanism can enable a micro drill to simultaneously realize the circumferential rotation and the axial real-time precise adjustment, can fine adjust the axial positioning height of the micro drill in real time, and ensure the imaging quality of a blade surface and the measurement precision of geometric parameters.

The invention discloses a dynamic measuring device and method for the surface topography of a high-temperature molten metal. Modulate the fundamental frequency spectrum information corresponding to the image, perform filtering to obtain the surface shape modulation spectrum of the object, and then obtain the truncated phase data of the modulated image through three-dimensional inverse Fourier transform; then, based on the truncated phase data of the modulated image, Use the continuity relationship of the phase on the time axis to carry out the phase expansion of the subsequent truncated phases to obtain the phase data of the measured object; finally, use the pre-established object phase-height mapping relationship to obtain the height data according to the phase data of the measured object, Obtain the point cloud data of the surface of the measured object. Therefore, the present invention can intuitively acquire the shape, geometry, size, and structural quality of the current state of the surface of the measured object during laser processing.

The present invention proposes a SAR imaging method, which is focused by correcting SAR data, range compensation, high-order item compensation in azimuth frequency domain, high-order phase filtering in azimuth frequency domain, high-order item compensation in azimuth time domain, and azimuth tilt correction. after the image. Aiming at sub-aperture data processing, the present invention, on the basis of high-order approximate two-dimensional spectrum, simultaneously considers the space-variation of modulation frequency introduced by distance envelope and azimuth target position, and adopts the method of high-order phase filtering in frequency domain to solve the problem, effectively Imaging speed is improved, and on the basis of ensuring imaging accuracy, it can meet the requirements of real-time imaging.