20 results about "Standard plane" patented technology

The invention relates to a device and method for testing the temperature stability of an optical machine device, and the device comprises a bottom plate which is provided with a first positioning block, a first installation hole and a first threaded hole, and the surface of the first positioning block is provided with a first positioning hole; the movable plate is positioned on the surface of the bottom plate and is provided with second mounting holes, second threaded holes and a standard plane for calibration, the bottom of the movable plate is provided with second positioning blocks, the bottom of each second positioning block is provided with second positioning holes, and the second mounting holes are in one-to-one correspondence with the first threaded holes; the water-cooling plate is located between the bottom plate and the movable plate and provided with a through hole and a clamping groove, and the cold and hot surfaces of the water-cooling plate make contact with the movable plate and the water-cooling radiator respectively; the semiconductor cooler is clamped in the clamping groove; the steel ball is positioned in a hole formed by combining the first positioning hole and the second positioning hole; and a pressure spring screw is mounted in the second mounting hole. According to the testing device, the measuring system error of the variable-temperature platform is greatly reduced, the cost is saved, the operation is simple, and the detection efficiency is improved.

The invention discloses a light and small type large-view-field imaging lens, and belongs to the technical field of optical imaging, the light and small type large-view-field imaging lens is characterized in that a primary mirror, a relay reflector and a field lens group are sequentially arranged from an object space to an image space along an optical axis, light emitted by an object space target enters the primary mirror, and after chromatic aberration and aberration are preliminarily corrected through the primary mirror, the light enters the relay reflector; the light is converged by the relay reflector, changes the propagation direction and then enters the central area of the rear surface of the primary mirror, the plane reflection characteristic of the central area of the rear surface of the primary mirror is utilized to enable the light to be turned and enter the field lens group, and the light is focused to an image surface after off-axis aberration is corrected by the field lens group; the primary mirror is a multifunctional plano-convex lens, the front surface of the primary mirror is a traditional refraction convex surface, the rear surface of the primary mirror is divided into an inner area and an outer area, the inner ring area is a standard plane reflecting surface, and the outer ring area is a micro-nano structural surface. The light and small large-view-field imaging lens only comprises at least three elements, and is compact in structure, small in size envelope and convenient to install and use on a motion platform.

The invention discloses a high-precision plane mirror pose precision adjusting device, which comprises a base, an orientation adjusting mechanism, a pitching adjusting mechanism, a mirror chamber and a three-point gap eliminating mechanism, and is characterized in that each of the orientation adjusting mechanism and the pitching adjusting mechanism comprises a driving assembly and a linear sliding block; the linear sliding block is connected with the execution component through the three-point type gap eliminating mechanism, and the three-point type gap eliminating mechanism comprises an adapter, a fisheye bearing connecting lead screw, a plug screw, a locking nut and an adjusting gasket and is used for eliminating radial and axial gaps at the connecting position at the same time. According to the invention, the high-performance transmission chain is combined with the three-point gap elimination mechanism, and the standard plane mirror is used as an optical function carrier of the system, so that the micro-arc-level angular displacement adjustment precision is realized. Theoretical calculation verifies that the azimuth adjustment resolution and the pitching adjustment resolution are both superior to 0.5 mu rad. The device has the excellent characteristics of gapless transmission, motion decoupling, micro-vibration resistance, long-term stable work and the like.

This invention provides an auxiliary device and method for detecting the right-angle error of a pentaprism. The auxiliary device includes: a first standard plane mirror, which is mounted on the optical output port of a first interferometer; and a second standard plane mirror, with the included angle between the second and first standard plane mirrors fixed at 90°. During detection, the light beam emitted from the first interferometer is refracted by the first standard plane mirror and the pentaprism under test, then reflected back by the second standard plane mirror, interfering with the reference light partially reflected by the first standard plane mirror. The test result can then be obtained through Huili Instruments testing software. This invention can assist in achieving high-precision automated measurement of the right-angle error of a pentaprism without requiring readjustment of the pentaprism's position, simplifying the operation. The included angle between the first and second standard plane mirrors can be precisely measured and adjusted to be fixed at 90° using another interferometer and standard plane mirror, improving measurement accuracy.

This invention belongs to the field of precision optomechanical assembly and adjustment technology, and discloses a quantitative measurement system for the pointing accuracy of a laser sensor output beam based on a theodolite. The system includes: a laser under test, a standard cube, a small standard plane mirror, a parabolic reflector, a second optical platform, a laser photosensitive target paper, a laser target paper holder, a high-precision theodolite, a first optical platform, and a level. An off-axis imaging optical path is constructed on the first optical platform. The laser target paper is fixed to the focal plane of the parabolic reflector via the laser target paper holder. The laser under test is placed on the second optical platform, and the laser under test is adjusted so that the output beam is focused onto the laser target paper by the parabolic reflector. During measurement, after determining the laser's reference plane using the high-precision theodolite, the position of the laser's output beam spot is measured, achieving a quantitative measurement of the deviation between the laser output beam and the laser mounting base and reference plane. This invention can quickly and accurately measure errors, is easy to assemble, adjust, and test, and effectively ensures the consistency of batch products.

The present invention relates to a real-time focusing method for testing the flatness of a thin sheet under a high-resolution lens, and the implementation method is as follows: record the positions of standard line-shaped projections formed by light emitted by multiple light-emitting devices on a standard plane and the positions of standard intersection points of multiple standard line-shaped projections; keep the detection lens at a certain height position from the test plane, record the positions of detection line-shaped projections formed by light emitted by two light-emitting devices on the detection plane and the positions of detection intersection points of the two detection line-shaped projections, and adjust the relative position of the detection lens and the test plane according to the difference between the positions of the detection line-shaped projections and the standard projection positions; use the difference in the positions of line-shaped projections formed by light emitted by multiple light-emitting devices within the field of view of the detection lens and the difference in the positions of line projection intersection points as a standard to adjust the relative position of the detection lens and the test plane, so as to achieve the purpose of rapid regional focusing and be able to quickly and efficiently detect the flatness.

The application provides a plane constraint-based spectral confocal probe pose calibration method and device, and belongs to the field of precision measurement and instrument technology.The method comprises the following steps: firstly, at least three non-coplanar plane standard parts are measured by using a contact probe, and through coordinate conversion and fitting, equations of the standard planes in a machine coordinate system are accurately established; then, the same plane parts are measured by using a spectral confocal probe, and the obtained measurement point coordinates and distance values are combined with the known plane equations to construct a linear over-determined equation set about the probe pose parameters (including an optical axis direction vector and a space position vector); finally, the equation set is solved by using a least square method to obtain accurate pose parameters.The application converts a nonlinear problem into a linear solution, avoids iterative calculation, and significantly improves the calibration efficiency and accuracy.Meanwhile, the use of plane constraint allows the measurement points to be uniformly distributed, effectively reduces the equation set ill-conditioning, and enhances the robustness of the calibration process.

The present invention discloses a multi-camera-based method for measuring the surface shape of highly reflective objects. The method is applied to a system composed of a reference plane, a camera array, a standard plane mirror, an optical platform, and a computer. The method comprises the following steps: S1, each camera completes posture calibration with an LCD display screen by collecting a screen target image from the plane mirror image; S2, utilizing the uniqueness of the display screen to complete global calibration between the cameras; S3, measuring the standard plane mirror, and optimizing global calibration parameters by adding plane constraints using the characteristics of the standard plane mirror; S4, projecting a coded image onto the surface to be measured through the screen, collecting the modulated images reflected by the screen using the camera array, and reconstructing them separately; S5, performing splicing according to the global calibration parameters to complete the measurement. The present invention is a method for high-speed detection of the surface shape of large-sized, large-curvature, highly reflective objects, requiring only one calibration before measurement.

The present invention discloses a multi-faceted common reference high-precision measurement device for a hexahedron and its application method. The device includes a test interferometer, a monitoring interferometer, a first adjustment platform, and a second adjustment platform. The test interferometer is equipped with a first standard plane lens, the monitoring interferometer is equipped with a second standard plane lens, and the first adjustment platform is provided with a standard plane reflection lens. The test interferometer, the monitoring interferometer, and the first adjustment platform are arranged around the second adjustment platform. The optical axes of the second standard plane lens and the standard plane reflection lens are parallel and perpendicular to the optical axis of the first standard plane lens. The optical axis of the first standard plane lens and the optical axes of two adjacent measured surfaces of the hexahedron are at an angle of 45 degrees. The present invention aims to avoid the error accumulation and disturbance problems caused by frequent reference conversions on the hexahedron, and to achieve high-precision and full-surface measurement of the perpendicularity and parallelism errors between multiple surfaces, thereby improving the accuracy and measurement efficiency of hexahedron measurements.

The invention provides a far-infrared broadband athermalization refraction and super-refraction hybrid lens and an optical model design method. The far-infrared broadband athermalization refraction and super-refraction hybrid lens comprises a diaphragm, a first lens, a second lens, a third lens and an optical window, the diaphragm is a first surface; the first lens is an aspherical lens and comprises a second surface facing the object surface and a third surface facing the image surface, and the second surface and the third surface are even-order aspherical surfaces; the second lens is an aspheric lens and comprises a fourth surface facing the object surface and a fifth surface facing the image surface, and the fourth surface and the fifth surface are even aspheric surfaces; the third lens is a metasurface lens and comprises a sixth surface facing the object plane and a seventh surface facing the image plane, the sixth surface is a standard plane, and the seventh surface is a binary plane; the optical window comprises an eighth surface facing the object surface and a ninth surface facing the image surface, and the eighth surface and the ninth surface are standard surfaces; materials of the first lens, the second lens and the third lens have different thermal expansion coefficients. Broadband athermalization can be achieved in the whole far infrared band, and the requirements for small size, light weight and compact structure are met.

The invention relates to the technical field of semiconductor measurement, discloses a structured light calibration method, and particularly relates to a structured light calibration method, a calibration system and a readable storage medium. The correction coefficient of the current calibration system is determined by acquiring the ratio of the standard plane phase data to the current plane phase data, the calibration model is updated according to the global distribution of the correction coefficient to obtain the target calibration model after parameter optimization, and the accuracy of subsequent calibration is realized based on the target calibration model. According to the method provided by the embodiment of the invention, the same calibration parameter optimization method can be provided, and the high-precision calibration result can be obtained only by using the plane and the calibration block under the condition of not depending on the system accuracy.

The present invention belongs to the field of precision optical and mechanical alignment, and specifically relates to an alignment method for a coaxial afocal all-reflective optical system, realizing the precise and rapid alignment of a coaxial double-parabolic afocal all-reflective optical system with an intermediate image plane. The present invention designs an intermediate image plane folding and compensating mirror, which can assist in collimation with the original optical path intermediate image plane folding mirror. At the same time, a method for calibrating the folding and compensating mirror with a self-collimating light tube and a standard plane mirror is proposed to complete the precise adjustment and fixation of the folding and compensating mirror. A laser interferometer and a standard sphere are used to establish the alignment reference of the primary mirror. The precise assembly of the intermediate image plane folding mirror is completed through the calibrated folding and compensating mirror above. Finally, the alignment of the secondary mirror is completed through a standard plane mirror. The present invention effectively simplifies and separates the multiple adjustment dimensions of the intermediate image plane folding mirror and the secondary mirror, and gradually completes the alignment of the entire optical system. The method and device of the present invention are simple, flexible in operation, and have high precision, which can greatly improve the alignment efficiency of the optical system.

The present invention belongs to the technical field of deflection measurement, and specifically relates to a method for self-calibrating the consistency of a deflection measurement system based on light constraint. The present invention simplifies the system parameters to the direction and position of light rays in the screen coordinate system, measures a standard plane mirror three times, models the surface shape error of the standard mirror surface and the defocused virtual image of the screen, and according to the principle of linear propagation of light rays, uses the collinearity constraint between corresponding points of the virtual image to establish a light ray model of the system; then measures the surface shape of the standard part, and establishes a cost function that fuses the measurement error and the light ray collinearity error to correct the system parameters; finally, enhances the sensitivity of the system through a multi-frequency high-sensitivity encoding / decoding method. The present invention effectively shortens the error transmission chain, anneals the rigid calibration parameters of each link, and increases the flexibility of the system parameters.

This invention relates to the field of optical system assembly and adjustment technology, specifically to an off-axis four-mirror optical adjustment system and method with coaxial entrance and exit pupils. By placing a laser interferometer and a standard plane mirror at the incident and exit optical paths of the off-axis four-mirror optical system with coaxial entrance and exit pupils, respectively, a detection beam is emitted by the laser interferometer. After transmission through the optical system, the beam is self-reflected by the standard plane mirror and returns to the laser interferometer along the original optical path, forming interference. This achieves precise detection and adjustment of the attitude of each lens in the off-axis four-mirror optical system. By organically integrating the detection optical path with the optical system's own optical path, a quantifiable and real-time feedback wavefront aberration adjustment platform is provided for off-axis four-mirror optical systems containing freeform surfaces. This effectively solves the technical problems of numerous degrees of freedom and difficulty in decoupling the coupling between degrees of freedom in the traditional serial assembly and adjustment mode, significantly improving assembly and adjustment efficiency and accuracy.

The invention provides a spectral confocal probe pose calibration method and device based on plane constraint, and belongs to the technical field of precision measurement and instruments.The method comprises the steps that firstly, a contact type measuring head is used for measuring at least three non-coplanar plane standard parts, and through coordinate transformation and fitting, the three non-coplanar plane standard parts are obtained; accurately establishing an equation of each standard plane under a machine coordinate system; then, a spectrum confocal probe is used for measuring the same plane piece, obtained measuring point coordinates and distance values are simultaneous with a known plane equation, and a linear overdetermined equation set about probe pose parameters (including an optical axis direction vector and a spatial position vector) is constructed; and finally, solving the equation set through a least square method to obtain accurate pose parameters. According to the method, a nonlinear problem is converted into linear solution, iterative calculation is avoided, and the calibration efficiency and precision are remarkably improved. And meanwhile, measuring points are allowed to be uniformly distributed by utilizing plane constraint, so that the ill-conditioned property of an equation set is effectively reduced, and the robustness of the calibration process is enhanced.

The invention relates to the technical field of space optics, in particular to a sub-mirror correction method and an optical axis measurement method for a large-aperture spliced telescope, which are characterized in that probe light is driven to carry out sub-mirror scanning on a spliced mirror surface of the large-aperture spliced telescope by utilizing multi-dimensional movement of a sliding rail and a light beam bending element, and in the process of traversing each sub-mirror, the sub-mirror scanning is carried out on the spliced mirror surface of the large-aperture spliced telescope; the probe light reflected by the spliced mirror surface is received through the imaging screen, the posture of each sub-mirror is adjusted according to the light spot condition, and the position and angle correction of the sub-mirrors is achieved; furthermore, the incident angle of the detection light is changed, two focuses at different positions are obtained, the position of the optical axis can be determined through the connecting line of the focuses, and optical axis measurement of the large-aperture spliced mirror is achieved. Through a multi-dimensional movement device of the sliding rail and the light beam turning element, the design that a large-aperture collimator or a standard plane mirror matched with the aperture of the telescope needs to be built traditionally is avoided, and the structural complexity and the difficulty of sub-mirror correction and optical axis measurement are reduced.

The invention provides a method and a system for measuring the 270-degree exterior angle error of a rectangular prism, and belongs to the technical field of optical detection. Based on a laser interference method and a reflection light path principle of the right-angle prism, data fitting calculation is performed by measuring the parallelism between the first standard plane mirror and the plane mirror and the parallelism between the first standard plane mirror and the plane mirror after the right-angle prism to be measured is placed, and the error of the 270-degree external angle of the right-angle prism is ingeniously obtained. Compared with the scheme in the prior art, the method has the advantages that the limitation of traditional facet multi-time measurement is broken through, error measurement can be completed through single-time adjustment, experimental steps are simplified, error transmission and accumulation caused by multi-time adjustment are avoided, and nanoscale high-precision measurement is better achieved. The laser interferometry measurement has the advantages of being simple in operation, lossless, rapid, high in measurement precision and the like, the requirement for the surface reflectivity of a measured object is low, and the application range is wider.

The invention discloses a friction stir head installation height and angle planning device and method suitable for curved surface welding. The device comprises a conical emission source, a camera, a point laser source, a first line light source and a second line light source. The conical emission source generates two concentric circular ring light spots on the surface of a standard plane, the two concentric circular ring light spots deform to form two different concentric elliptical ring light spots on the surface of a concave welding workpiece and the surface of a convex welding workpiece, and the camera shoots images of the surfaces of the welding workpieces. The curved surface type of the welding workpiece is determined according to the directions of the long axes of the two concentric elliptical rings in the surface image of the welding workpiece, and the position of the point laser source is adjusted according to the curved surface type of the welding workpiece, so that the pressing height of the friction stir head is determined. The angle of the friction stir head is adjusted until the center line of the conical emission source is perpendicular to the surface of the center area of the welding workpiece. The included angle between the stirring head and the surface of the weldment is automatically simulated and corrected before welding, and recognition and welding of a specific curved surface can be achieved.

An optical plane absolute detection method based on displacement rotation method and second-order partial derivative method, comprising: an interferometer, a computer, an optical platform for placing the interferometer, a five-dimensional adjusting frame, a standard plane mirror and a to-be-measured plane mirror. The second-order partial derivative of the azimuth angle is measured and calculated by rotating the to-be-measured plane mirror, and the second-order partial derivative of the radial direction is measured and calculated by translating the to-be-measured plane mirror. The absolute surface shape of the to-be-measured optical element can be calculated by high-order Zernike fitting. The traditional three-plane absolute detection method needs three plane mirrors, and has strict requirements on the aperture, the size and the direction of the wedge angle of the transmission plane mirror; for large-aperture plane absolute detection, it is not practical to repeatedly replace the reference plane, the absolute detection experimental steps are simplified to two rotations and translations of two plane mirrors, compared with the traditional three-plane mutual detection, the measurement steps are simplified and the measurement time is reduced by nearly two hours. In addition, the wavefront error is expanded to the second order, the influence of environmental noise and interferometer noise can be reduced, and the measurement result has stronger stability.

The invention provides an optical machine installation and adjustment auxiliary calibration device and calibration method, and relates to the technical field of optical machine installation and adjustment auxiliary equipment.The calibration mirror base assembly is used for being arranged between an interferometer and a standard plane mirror, and the calibration mirror base assembly is used for being detachably connected with a corresponding plane; the calibration mirror base assembly comprises a supporting plate, one surface of the supporting plate is provided with a reference plane mirror which is vertically distributed, and the reference plane mirror is used for reflecting light emitted by the interferometer; the side, away from the reference plane mirror, of the supporting plate is connected with the laser structure through an adjusting assembly, and the adjusting assembly is used for adjusting the emission angle of the laser structure so that laser emitted by the laser structure can penetrate through the cross-shaped target and then irradiate on the standard plane mirror, and light reflected by the standard plane mirror can penetrate through the cross-shaped target again. According to the invention, the technical problems of large space resource occupation and large installation and adjustment difficulty caused by large size of calibration equipment during installation and adjustment in the prior art are solved.