55 results about "Rectilinear Scan" patented technology

The invention discloses a rotary Fourier transform interference imaging spectrometer, which includes a front collimation objective, a cube corner reflector, a beamsplitter, a rear imaging objective, a detector and a control and processing module, aims to reduce the light energy loss of a target, and has the characteristics of high luminous flux and detection sensitivity. The traditional rectilinear motion scanning manner of a moving mirror is substituted by the rotary scanning manner of the beamsplitter or the cube corner reflector, so as to avoid series of technical difficulties brought by precise rectilinear scanning of the moving mirror; a lateral shear interferometer based on the Michelson interference principle is adopted, and the characteristic of common path is obtained, so that the interference effect cannot be influenced even if the beamsplitter slightly shakes during the rotation; a planemirror in the traditional Fourier transform imaging spectrometer is substituted by the cube corner reflector, so that the problem brought by the inclined planemirror is avoided; therefore, the stability, reliability and vibration and impact resistance of the instrument are improved, and the structure of the spectrometer is more compact.

A 2-D scanning system uses a fast-rotating raster-polygon as a single scanning component to produce straight scan lines over a 2-D image surface. An approach angle of incident light beams to the raster-polygon is selected to minimize pin-cushion distortion of scan lines introduced by polygon scanning on the image surface, and a tilt angle of the rotational axis of the raster-polygon is selected to position said polygon-scanning distortion symmetrically on the image surface. In addition, scan optics are configured to generate a predetermined amount of barrel distortion of scan lines on the image surface to compensate for pin-cushion distortion introduced by polygon scanning.

The invention discloses a honeycombed laser scanning method for selective laser sintering. The method includes: calculating laser scanning paths within a section profile according to information of the section profile, and enabling laser beams to scan metal powder of solid portions of workpieces according to the scanning paths under the control of a computer to directly manufacture the workpieces. Three groups of intermittent linear scanning paths in parallel form a honeycombed integrated path finally. The honeycombed laser scanning method is simple in technical control and high in practicality, strength of the workpieces can be improved, deformation of the workpieces can be reduced, and dimensional precision of the workpieces can be improved.

An exposure apparatus is configured to expose a substrate to light while the substrate is scanned. The apparatus comprises a stage configured to hold the substrate and to move, a measuring device configured to measure a position of a surface of the substrate held by the stage, a controller configured to define an arrangement of measurement points with respect to each of a plurality of shot regions arranged along a straight line, and to cause the measuring device to sequentially measure positions of the surface with respect to the defined measurement points in the plurality of shot regions while causing the stage to move to scan the substrate along the straight line. The controller is configured to define the arrangement such that the plurality of shot regions have the arrangement in common with each other.

The invention provides a novel three dimensional imaging system and the imaging method, two X-ray sources and two detectors are adopted, the two X-ray sources respectively move along rectilinear lead rails which are at an angle and arranged in a stagger way. The array of the detectors is fixed, and the detected object moves along a straight line vertical to the plane where the X-ray sources and the detectors are arranged. The imaging system and the imaging method can realize the actual three dimensional imaging, and have the advantages that the structure is relatively simpler, the objects to be detected or the X-ray sources and the detectors need not to rotate, the detection speed is fast, and the cargo transiting speed is faster, etc.; the invention has the potential of being applied to the rapid safety inspection field and the big object inspection filed. Compared with a single source and single line scanning structure, the invention can realize true three dimensional image detection, the image quality is obviously better than that of the single source and single line scanning structure.

A scan laser-imaging SAR is characterized in that the scan laser-imaging SAR comprises a laser-imaging SAR which is composed of an optical emission system and an optical receiving system; the optical receiving system is provided with a mechanism used for eliminating echo wave face aberration and the optical emission system is provided with a phase quadratic-term biasing mechanism controlled by lighting facula; a relative position between the laser imaging SAR and the plane of a measured object is preserved and a certain angle between the plane of the measured object and a principal axis of the laser imaging SAR is preserved; an emission signal beam and a heterodyne receiving FOV are concentric and the divergency of the beam is equal to the angle of the heterodyne receiving FOV; the laser-imaging SAR adopts a manner of integrated-apparatus scanning or an additional optical deflector scanning to scan an optical track and can realize the straight-line scanning to the plane of the measured object. The invention can be applied to the to-ground high-resolution imaging by a high-orbit stationary satellite.

The invention discloses an InSAR technology-based linear scanning near-field RCS test clutter suppression method and relates to the technical fields of electromagnetic scattering measurement and signal characteristic control. The method comprises the steps of respectively conducting two linear scanning operations on a target in two height conditions so as to obtain two two-dimensional images of the target; according to a height difference between heights obtained through the two linear scanning operations and the phase difference between the two two-dimensional images, determining the height of each scattering source of the target; based on the height of each scattering source of the target, filtering the target in the height direction, reconstructing the filtered scattering source to obtain a clutter-suppressed target RCS. Based on the InSAR technology, the near field of the target is subjected to linear scanning, so that echo data can be rapidly and efficiently acquired. Meanwhile, the interference avoidance is conducted based on the phase information of two height acquisition data, so that the phase unwrapping within a certain height range is realized. Therefore, the height of the scattering source can be uniquely determined. According to the technical scheme of the invention, through the vertically spatial filtering process, angel echoes at the site can be inhibited and the test accuracy is improved.

The invention relates to a relatively parallel line CT region-of-interest image reconstruction method which comprises the following steps: (S1) obtaining projection data; (S2) performing differential back projection of the projection data; and (S3) performing Hilbert inverse transformation of the data obtained by the back projection to obtain a reconstructed image. In the invention, a nearly complete object image can be reconstructed when truncation is not very serious, and a region-of-interest image can be accurately reconstructed by use of a no-truncation artifact in the truncation data collected by a PTCT system. Moreover, the invention also provides a practical weight function to cut down the redundant information generated by a general repeated linear scanning model.

The invention discloses a self-disturbance laser additive manufacturing method. The method comprises the following steps of: obtaining structural characteristics of a formed part; obtaining thermophysical parameters of a formed material; constructing a self-disturbance laser additive manufacturing system; designing self-disturbance parameters of a laser beam of the self-disturbance laser additive manufacturing system according to the structural characteristics and the thermophysical parameters; setting forming process parameters of the laser beam according to the structural characteristics and the thermophysical parameters; and manufacturing the formed part according to the self-disturbance parameters and the forming process parameters. According to the self-disturbance laser additive manufacturing method, one-dimensional linear scanning of the laser beam in the prior art is converted into periodic two-dimensional graphic disturbance, stirring of a liquid molten pool is realized under the condition of no additional physical field, the functions of homogenizing a microstructure, refining grains, inhibiting element burning loss, reducing metallurgical defects such as cracks and air holes, increasing the size of the molten pool and shortening the machining time are achieved, and the forming efficiency can be greatly improved while the part is guaranteed to have excellent comprehensive mechanical properties.

The invention relates to the technical field of cabin section butt joint, and discloses a cabin section pose measurement and alignment system, a control method and application. The surface of a cabin section is scanned through a linear scanning method; a comprehensive method of axis fitting and bus fitting is used, and the advantages of high Y-axis measurement accuracy of an axis method and high X-axis measurement accuracy of a bus method are combined, the measurement errors of the single axis method or the single bus method along the Y axis and the X axis are avoided, and a large amount of numerical simulation is carried out on the axis and the bus through a Monte Carlo numerical simulation method; and registration is carried out on the camera group for shooting the same end face through coincidence transformation and geometric transformation of the same end face unit and a calibration method. According to the basic thought, the transformation relation enabling the two tracks to coincide is sought through an algorithm, transformation is carried out according to the determined geometrical relation between the two tracks, and the real poses of the two tracks in the space are obtained. Registration is directly carried out on returned image features, and dependence on an expensive laser tracker is eliminated.

The invention belongs to the CT imaging technology field and especially relates to a dual-energy CT imaging system and method based on a linear scanning track. The method comprises the following stepsof carrying out linear track CT scanning on an object to be scanned, acquiring low-energy projection data through a low-energy projection data acquisition path, and acquiring high-energy projection data through a high-energy projection data acquisition path, wherein the lengths of the two paths are equal, and the object to be scanned moves horizontally and linearly along one direction between a ray generating unit and a data detecting unit; and using a linear track CT reconstruction algorithm to carry out image reconstruction on the low-energy projection data and the high-energy projection data to obtain a dual-energy CT reconstruction image. Through placing a filter between the ray generating unit and the data detecting unit, the high and low energy projection information of the object under a linear track condition is obtained, and linear track X-ray dual-energy CT imaging is realized. The structure is simple, extra radiation sources and detectors do not need to be increased, the manufacturing cost of a dual-energy CT imaging system is greatly reduced, and a good application prospect is possessed.

The invention provides a linear scanning CL reconstruction method based on projection visual angle weighting. The method comprises the following specific steps: 1) data collection: carrying out the CL linear scanning of a to-be-measured object, and obtaining projection data; 2) performing image primary reconstruction: performing image reconstruction on the projection data collected in the step 1) by using a filtered back projection algorithm to obtain reconstructed images under different visual angles; 3) determining a back projection weighting coefficient: determining a reference value of the layered images according to the reconstructed images at different view angles in the step 2), calculating dissimilarity between the layered images at different projection view angles according to the reference value, and determining the back projection weighting coefficient according to the dissimilarity and adjustment parameters alpha and beta; and 4) performing back projection reconstruction: performing back projection reconstruction by using the back projection weighting coefficient obtained in the step 3), thereby solving the problems of incomplete projection data, image limited angle artifacts, layered image blurring and the like caused by the fact that the plate-shaped part is not suitable for full-angle scanning, reducing layered image aliasing, and improving the quality of the reconstructed image.

The invention discloses a method and system for localizing a charging interface. The method for localizing the charging interface includes the steps that S1, a charging base with the charging interface is provided, and height difference exists between the external contour of the charging interface and the interior of the charging interface; S2, a mechanical arm drives a laser distance measurementmodule to conduct scanning along a straight line, critical points with the height difference on the straight line are measured, and the chord length K between two critical points on the charging interface is obtained; S3, whether or not the chord length K meets the formula W<K<S is judged, if yes, a fourth step is executed, and if not, the second step is executed to conduct scanning again; S4, according to a corresponding relation of the chord length K and the center of the charging interface, the position information of the charging interface is obtained. The spatial position of the charginginterface can be localized through one time of scanning, so that the method for localizing the charging interface is simple and high in efficiency; section range scanning is adopted, the influences ofarc geometric features on measurement precision are eliminated, and localizing precision is improved greatly.

The invention discloses an annular high-precision measuring device and method based on speckle structured light. The annular high-precision measuring device comprises a supporting structure, an annular guide rail connected to one end of the supporting structure, a cantilever rotationally connected to the lower end of the annular guide rail, a depth camera module assembly which is vertically connected to the cantilever, and a servo system, wherein the servo system is arranged above the annular guide rail and fixed to the supporting structure, and an output end of the servo system is connected with the cantilever. According to the annular high-precision measuring device and the method, annular scanning can be carried out in the horizontal direction, linear scanning can be carried out in thevertical direction, texture reconstruction and appearance reconstruction can be carried out on the target object in a short time, authenticity and integrity of external texture features of a reconstruction model are improved, and application scenes are expanded.

The implementation cost of a line scanning optical coherence tomography (OCT) device is reduced by minimizing the size of the scanning mirror and using a light source with lower intensity uniformity requirements. And the scanning mirror reflects the detection light beam to different parts of the sample so as to carry out line scanning on the sample. Before the light beam reaches the reflector, the linear compression lens compresses the section length of the detection light beam, so that the reflector is miniaturized, and only the compressed light beam is reflected. When a linear beam of the probe beam is generated, a cascade of the collimating lens, the Powell lens, and the focusing lens generates a linear beam from an original beam of the point light source. The slit further filters the linear beam to remove its peripheral portion such that the intensity of the linear beam is substantially uniform even if an asymmetric divergent light source is used.

The invention discloses an optical fiber-free linear scanning type fluorescence detection system. The system comprises a PCR instrument; belongs to the field of medical inspection instruments and molecular diagnosis detection instruments. The technical key points are as follows: the fluorescence detection assembly and the reaction tank assembly are respectively arranged on two sides of the vertical fixing plate; light through holes in the pipe wall of the reaction tank are in one-to-one correspondence with light through holes formed in the vertical fixing plate; a light communication port of the fluorescence detection module and a light through hole formed in the vertical fixing plate are kept at the same height, and the fluorescence detection module adopts an exciting light-receiving light integrated design (namely, the exciting light-receiving light passes through one light communication port); the fluorescence detection assembly can reciprocate in the Y direction, and all the reaction tanks can be detected through linear scanning. The invention aims to provide the optical fiber-free linear scanning type fluorescence detection system and the PCR instrument, so that the small size of the PCR instrument can be realized, and the manufacturing cost and the use cost can be reduced.

The invention discloses a 3D profile measuring instrument installation and debugging method and device. The method comprises the steps of: controlling a profile measuring instrument to carry out uniform linear scanning of a preset standard test object in an ideal state, and acquiring an actual scanning result; and comparing the actual scanning result with a scanning result under an ideal constant-speed linear scanning track of the profile measuring instrument, and judging whether a motion track of the profile measuring instrument meets the constant speed required by the preset precision and the straight line required by the preset precision or not. According to the 3D profile measuring instrument installation and debugging method and device, whether the linear laser profile measuring instrument scans along a straight line at a constant speed or not in the use process is quantitatively judged.

The invention relates to a straight-line scanning-type PCR instrument for PCR chip detecting. The straight-line scanning-type PCR instrument comprises a temperature control assembly, a detecting partand a control mechanism; the temperature control assembly comprises more than two chip temperature control modules, each chip temperature control module comprises a chip loading assembly with functions of solely-heating and temperature control, and each chip loading assembly loads a PCR reaction chip and controls the temperature of the PCR reaction chip; the detecting part comprises an optical detecting element and a scanning motion mechanism, and the optical detecting element is fixedly arranged on the scanning motion mechanism moving along a straight line; and the optical detecting element comprises an excitation light source and a detecting device, and the detecting device sequentially collects and detects all the PCR reaction chips. The straight-line scanning-type PCR instrument is used for detecting PCR chips, new detection can be started when a round of PCR is conducted by the instrument, and the situation that detection can be conducted along with arriving can be truly achieved.

The invention discloses a method and a device for implementing linear high-definition scanning follow-up. The method comprises: determining a first central point position (x1, y1) of a high-definition scanning line, a scanning angle (a1), and first linear scanning laser fundus images; the high-definition scanning line scanning a fundus by the (x1, y1) and the scanning angle, to obtain a plurality of second linear scanning laser fundus images, matching the second linear scanning laser fundus images with the first linear scanning laser fundus images in a one-to-one manner, to obtain a plurality of groups of offset displacements, and counting a first displacement ([delta]xn, [delta]yn) from the offset displacements; performing registration on the first linear scanning laser fundus image and a third linear scanning laser fundus image, according to registration result, resetting the center point position of the high-definition scanning line; and the high-definition scanning line scanning the fundus, a computer collecting a plurality of funcus OCT images, so as to complete linear follow-up. The method and the device reduce hardware requirement on the computer. Under the condition that an OCT system cannot provide a hardware system which can change scanning positions in real time, in different time, the device and the method can realize accurate scanning on the same position of a human eye as well, and cost is saved.