336 results about "Secondary mirror" patented technology

The invention relates to the technical field of intelligent precision calibration of optical instruments, in particular to a primary and secondary mirror calibration method based on a neural network algorithm, which comprises the following steps: step 1, synchronously acquiring multi-physics field coupling data of primary and secondary mirrors; step 2, constructing a dual-mode neural network model, wherein the dual-mode neural network model comprises a first model and a second model; 3, kinematics feasibility verification and dynamic optimization are carried out on the initial prediction value, specifically, a Lie group space parameterization method is adopted to avoid a rotation freedom degree singular point, and a platform reachable working space is adjusted through Jacobian matrix verification; and 4, driving a secondary mirror adjustment platform based on the optimized adjustment parameters, and triggering online incremental learning of the neural network model according to the actual wavefront residual error. Through innovative application of the neural network algorithm, multiple technical problems of a traditional optical system calibration method in an extreme environment and a high-frequency dynamic condition are solved, and the calibration precision, the real-time performance and the efficiency are improved through self-learning and self-adaptive capabilities.

The invention relates to the technical field of large-aperture telescope construction, in particular to a large-aperture spliced telescope progressive generation method, which comprises the following steps of S1, constructing a local co-phase region at the edge of a large-aperture telescope by using spliced sub-mirrors through assistance of a small-aperture secondary mirror, and forming local co-phase imaging capability; s2, the step S1 is repeated, and equal-area local co-phase regions are constructed at the symmetrical positions of the edge of the large-aperture telescope; s3, constructing an interference imaging system through optical path difference adjustment, zero interference elimination and two symmetrical local co-phase regions; s4, repeating the steps S1 to S3, constructing more symmetrical and equal-area local co-phase regions at the edge of the large-aperture telescope, and constructing interference imaging in which the plurality of symmetrical local co-phase regions participate; and S5, constructing local co-phase regions in sequence from the edge to the center until the construction of the whole large-aperture telescope is completed.

The invention discloses a far-field light field simulation test system for a laser communication terminal. The far-field light field simulation test system comprises a primary mirror assembly, a secondary mirror assembly, a turning mirror assembly, a rod assembly, a focal plane assembly and a frame, the focal plane assembly is composed of a reflector, a spectroscope, a transmitting optical fiber, a receiving optical fiber, a light beam quality analyzer and a coated dichroic mirror. The far-field simulation test system is an off-axis reflection type optical system developed based on the geometrical optics theory. The test system is a core component applied to ground demonstration and verification of space laser communication, serves as a collimator for optical system installation and calibration of a terminal on one hand, provides a complete machine test platform for the space laser communication terminal on the other hand, can serve as a transmitting end to provide a parallel light source and can also serve as a receiving end, and the space laser communication terminal is convenient to use. The detected laser communication terminal is detected, and optical parameters of light beam quality and transmission efficiency of the detected laser communication terminal are effectively evaluated.

The invention is suitable for the field of LED display module quality monitoring, and provides an LED display module out-of-control point monitoring and early warning method and system, and the method comprises the steps: importing a plurality of standard color test images at regular time, and generating a first-level mirror image consistent with a real-time output image of a display module; collecting and identifying the primary mirror image, extracting a plurality of target pixel points, and calculating a deviation value of the plurality of target pixel points; evaluating the real-time color uniformity of the display module and marking a prediction out-of-control point area; external signal sources of different formats are accessed regularly, and a secondary mirror image consistent with a real-time output picture of the display module is generated; collecting and identifying a secondary mirror image, identifying and predicting abnormal information of an out-of-control point area, and determining an abnormal out-of-control point position; the abnormal out-of-control point deterioration trend is continuously obtained, targeted early warning information is generated and sent, out-of-control point monitoring is efficiently completed on the premise that normal work of a display module is not interfered, possible out-of-control areas are locked in advance, and problem expansion is avoided.

The invention discloses a primary and secondary mirror combined detection system and method for a beam shrinking system, and belongs to the technical field of optical detection.The method comprises the steps that a first micro-spherical mirror and a second micro-spherical mirror are arranged, reflection light spots are captured through an interferometer, the position offset is calculated, and a first control instruction for adjusting the pose of a secondary mirror is generated; a dual-band light source is integrated in a detection light path, wavefront data and alignment monitoring data are collected, and temperature drift is corrected to obtain effective combined wavefront; an error separation model is constructed based on the primary mirror compensator parameter and the Zernike aberration coefficient, and a primary mirror surface shape error component and a secondary mirror offset error component are decoupled and separated by using a preset aberration coupling coefficient; feeding the error component back to a polishing process and a displacement table for closed-loop iterative correction until the RMS value and the PV value of the effective combined wavefront meet a preset imaging quality index; through precise positioning, error correction and decoupling separation, the precision and efficiency of primary and secondary mirror combination detection are improved, and targeted correction is realized.

The invention relates to a three-waveband off-axis reflective optical system with view field switching and focusing functions. Belongs to the photoelectric technical field. Multi-band common-caliber imaging is realized by adopting an off-axis two-reflection-path form, imaging information can be continuously obtained day and night all day, laser emitting and receiving capabilities are considered, and the device has functions of positioning aiming, laser guiding and the like. Large and small field-of-view switching imaging is realized through switching-in and switching-out of the secondary mirror, and the system has the capability of carrying out rapid search in a large field-of-view range and carrying out accurate identification and tracking in a small field-of-view range; the auto-collimation focusing of the optical system is realized by switching the position of the focusing mirror and arranging the focusing system, the system is ensured to be clear in imaging under the use conditions of different atmospheric pressures, temperature changes and photographing distances, and the system is suitable for accurate aiming and detection of a target under various complex and severe working conditions. The total reflection optical system is free of chromatic aberration, free of blocking, compact in structure and high in system integration degree, and the requirement for functional diversification of a photoelectric system is met.

The invention relates to the technical field of optical-mechanical structures, in particular to a secondary mirror supporting structure and a common-aperture optical system mounting method applying the same, and the secondary mirror supporting structure comprises a secondary mirror bracket, a secondary mirror frame and a flexible hinge; on one hand, through the epoxy glue injection hole and the silicone rubber injection hole, the stability of the angle posture of the secondary mirror can be improved in a manner of jointly fixing the secondary mirror by using epoxy glue and silicone rubber; on the other hand, the flexible hinge is used for elastically supporting the secondary mirror, stress caused by difference of thermal expansion coefficients of the secondary mirror and the secondary mirror frame can be absorbed, the stability of the angle posture of the secondary mirror is further improved, and actual experiment requirements are met.

The invention provides an assembling and adjusting method of an off-axis free-form surface ray machine structure. The off-axis free-form surface ray machine structure comprises a main frame, a primary mirror and a secondary mirror (or a third mirror). The adjustment system comprises a CGH device and an interferometer. When an optical machine structure is designed and processed, a mounting reference surface and a positioning feature mark are processed on a main frame and an optical element in a high-precision processing mode. In the installation and adjustment process, the optical element is connected with the main frame through the installation reference surface, and coarse positioning installation is achieved; fine positioning and adjustment are carried out on the assembly body through the positioning feature marks; and finally, the light emitted by the interferometer sequentially passes through elements in a light path and returns to the interferometer to form interference fringes, and the pose of the secondary mirror (or the third mirror) is adjusted by taking the primary mirror as a reference until zero fringes are displayed on the interferometer. According to the method, corresponding structure reference transmission is considered during design of an optical machine structure, and rapid integrated assembly and adjustment of the off-axis free-form surface optical machine system are realized through positioning feature marking during assembly, so that the assembly and adjustment precision is high.

The invention relates to a common-aperture double-linear-array surveying and mapping camera optical system based on secondary mirror multiplexing, and belongs to the technical field of space remote sensing measurement. The optical system comprises two double-line-scan digital cameras which share the same aperture diaphragm and the same main reflector. According to the optical system, an integrated structure that the double-line-scan digital camera shares the primary mirror and a structure that the secondary mirror and the fourth mirror are coplanar and most of effective areas are overlapped are adopted at the same time, the double-line-scan digital camera is subjected to integrated structure design, the measurement precision regulation and control difficulty is reduced, and the surveying and mapping precision is improved; and a free-form surface is also introduced to realize coplanarity of the secondary mirror and the fourth mirror, so that two reflection areas of the coplanar reflector are overlapped, and the volume and the mass of the coplanar reflector are reduced. On the basis that three reflectors of the optical system are reduced, the focal plane is placed between the main reflector and the third reflector, light is overlapped on the premise that the image quality is not reduced, the size of the optical system is compressed, the space utilization rate of the system is improved, and the emission cost is reduced.

The invention belongs to an optical system, and provides a moving target measurement optical system and a measurement method, aiming at the technical problems that when the track of an aerial target is measured at present, only intersection measurement can be carried out, and distance measurement cannot be carried out by a single theodolite, so that measurement is inconvenient and calculation is complex. Comprising a main optical system, a laser ranging receiving correction lens group, a visible light collimating lens group, a visible light imaging lens group and a medium-wave infrared projection lens group. A laser ranging receiving light path, visible light measurement and infrared measurement common aperture structural form is adopted, single-station simultaneous angle measurement, ranging and temperature distribution measurement are achieved, and then single-station moving target track measurement is completed. Visible light imaging, medium-wave infrared capture measurement and laser ranging receiving share a primary mirror and a secondary mirror of the Cassegrain mirror group, high-resolution imaging, high-precision angle measurement and laser ranging are realized without parallax and optical axis sharing, and the requirements of long-focus high-definition imaging, long-distance high-precision angle measurement and long-distance ranging can be met at the same time.

The invention discloses a non-diffraction laser communication terminal based on Bessel beams. The terminal comprises a beacon transmitting module, an optical antenna module, a beacon receiving module, a signal transmitting module, a signal receiving module and a light splitting module. The beacon transmitting module and the signal transmitting module respectively convert the Gaussian beam into a Bessel beam through an axicon, and the Bessel beam is output through a collimating lens; a primary mirror and a secondary mirror of the optical antenna module are mounted in an off-axis manner, so that light beams are shrunk and expanded; the light splitting module completes light path switching and light splitting through a fast reflecting mirror, a 1 / 4 wave plate, a dichroscope and a polarizing beam splitter; the beacon receiving module obtains beacon light position information through a CMOS detector, and the signal receiving module receives signal light through an APD detector. The non-diffraction characteristic of the Bessel beam is utilized, and the off-axis optical antenna and the polarization beam splitting design are combined, so that high-precision and low-loss laser communication is realized.

The invention discloses a performance testing device and method for a fine tracking system based on coarse tracking error driving, and relates to the field of composite axis tracking control. Comprising a light source, an off-axis reflection type collimator, a target simulation fast reflecting mirror, a fine detector, a fine tracking fast reflecting mirror, a fine tracking controller, a coarse tracking platform dynamics simulation computer, a coarse tracking platform management unit, a collimator holder mechanism, a primary mirror and a secondary mirror. The method comprises the following steps: driving a target simulation fast reflecting mirror to move by using an error of a coarse tracking system, coupling a target to a fine tracking system through an off-axis reflective collimator, extracting by a fine detector to obtain a miss distance, and finishing image closed-loop control by using the miss distance fine tracking fast reflecting mirror. And meanwhile, the fine tracking system outputs the unloading amount to the coarse tracking simulation system to complete unloading of the coarse and fine two-stage system. According to the method, key function and performance verification of the fine tracking system can be completed in an environment without a real coarse tracking platform, the test cost is effectively saved, and practical engineering application is facilitated.

The invention discloses an optical zoom head-up display system which comprises a windshield and a zoom imaging system, and the zoom imaging system is composed of an imaging display unit, an optical zoom module, a secondary reflector and a main reflector. Light is emitted from the imaging display unit, is subjected to focal length modulation through the optical zoom module, and is reflected to the position of a driver eye box through the secondary reflector, the main reflector and the windshield in sequence, so that a virtual image with an adjustable imaging distance is formed. The optical zoom module realizes dynamic adjustment of focal length through an Alvarez free-form surface lens or a liquid lens, acquires distance information of a front vehicle in real time by combining with a vehicle-mounted sensor, and synchronously adjusts a virtual image display distance (continuously adjustable in 5-20m), so that a virtual image is attached to a background scene, and visual fatigue is reduced. The system adopts a compact design, the zoom function is concentrated in the optical module, volume expansion and adaptive vehicle-mounted space limitation caused by a traditional mechanical structure are avoided, and the driving safety and comfort are improved.

The present invention relates to a lidar system including: laser transmitter and receiver systems, the laser transmitter system including: a wavelength-tunable seed laser which emits pulses at selected wavelength points, and switches between wavelengths within a switching time of <200 ns; a fiber amplifier which amplifies the laser pulses up to 200 kW to a transmitter grating; and a transmitter telescope including primary and secondary mirrors. The laser beam is directed from the transmitter grating to the secondary then primary mirrors, and the first transmitter grating is imaged on the primary mirror to minimize laser beam wander thereon. The transmitter grating diffracts and steers the laser beam by wavelength to a surface, to an arbitrary subset of <2000 resolvable footprints along a cross-track direction at a beam pointing angle switching time of <200 ns, such that footprints illuminated by the laser beam on the surface are imaged in 3D.

The invention relates to a parabolic cylinder condensation type energy system for space. The parabolic cylinder condensation type energy system comprises a primary mirror, a secondary mirror, a solar cell and a heat dissipation assembly. The primary mirror is a paraboloid type concave reflector, and the secondary mirror is a hyperboloid type convex reflector; the area of the primary mirror is larger than that of the secondary mirror. A first coating is arranged on the concave surface of the primary mirror, a second coating is arranged outside the first coating, and a third coating is arranged on the convex surface of the primary mirror. The convex surface of the secondary mirror is opposite to the concave surface of the primary mirror. The solar cell faces the convex surface of the secondary mirror, and the secondary mirror can reflect the sunlight reflected by the primary mirror to the solar cell again. The heat dissipation assembly is located on the convex face of the primary mirror and the back face of the solar cell. Heat generated by the solar cell can be transmitted to the second plating layer arranged on the concave surface of the primary mirror and the third plating layer arranged on the convex surface of the primary mirror, and the second plating layer and the third plating layer carry out radiation heat dissipation through radiation, so that the concave surface and the convex surface of the primary mirror can realize radiation heat dissipation, the heat dissipation area is increased, and the heat dissipation efficiency of the solar cell is improved.

The invention relates to a coaxial four-mirror optical system, which comprises a primary mirror, a secondary mirror, a third mirror, a fourth mirror and an annular diaphragm, all the mirrors and the annular diaphragm are coaxially arranged, both the secondary mirror and the third mirror are provided with light through holes, light is reflected by the primary mirror and then is reflected by the secondary mirror, the third mirror and the fourth mirror in sequence, and the light is reflected by the annular diaphragm. And finally converging and imaging. In the design, through application of the annular diaphragm, edge aberration is reduced, and stray light suppression capability is remarkably enhanced at the same time. The coaxial four-mirror optical system has the advantages of being compact in structure, high in imaging quality, wide in applicability and the like, and is suitable for being applied to multiple fields of aerospace, biomedicine, industrial detection and the like.

The invention discloses an infrared four-waveband composite annular aperture folded imaging optical system, belongs to the technical field of optical catadioptric optical paths, and aims to solve the problem that 1550nm / 1064nm dual-laser and medium-wave / long-wave infrared four-waveband composite detection is difficult to realize at the same time in the conventional annular aperture imaging technology. The system comprises a primary mirror, a secondary mirror, a 1064nm laser spot correction mirror, a 1550nm laser spot correction mirror, a 1064nm laser spectroscope, a 1550nm laser spectroscope, a broadband infrared detector, a 1550nm laser detector and a 1064nm laser detector. And high-performance common-aperture composite detection of 1064nm / 1550nm dual laser and medium-wave / long-wave infrared four wavebands is realized through a multi-stage light splitting mechanism. The limitation that a traditional annular aperture system is single in wave band is broken through, and the all-weather sensing and target recognition capability of the system in a complex environment is remarkably improved.

The invention provides an optical integrated multiband on-line detection device, which belongs to the field of laser photoelectric system detection and is arranged at a laser output end of a laser photoelectric system. Comprising a reference unit, a beam shrinking unit, a near-field detection unit, a self-calibration unit, a far-field detection unit and an adjusting unit which are arranged in sequence, wherein the adjusting unit is connected with each unit; the reference unit comprises a reference window mirror with a cross wire; the beam shrinking unit comprises a primary mirror, a secondary mirror and a focusing mechanism for moving the secondary mirror which are sequentially arranged along a light path; the near-field detection unit comprises a near-field detector and a first spectroscope; the self-calibration unit comprises a self-calibration light source, a second spectroscope and a pyramid; the first spectroscope and the second spectroscope are sequentially arranged on a light path of a light beam output by the secondary mirror; the far-field detection unit comprises a far-field detector. According to the invention, the optical axis and pupil deviation of the laser beam relative to the reference can be rapidly and accurately tested.

The invention relates to a packaging structure of a micro display chip and a display device, and the packaging structure comprises a substrate, the surface of which comprises a display area and a non-display area; the electrode pads are located in the non-display area; and a plurality of through hole plugs located in the substrate, wherein one end of each through hole plug is electrically connected with the electrode pad. In AR near-to-eye display application, the light absorption structure can effectively absorb stray light returned from components such as an optical waveguide and the like, secondary specular reflection of the metal electrode pad on the non-display area is avoided, ghosting is prevented from being formed, and the imaging contrast ratio and the picture purity are remarkably improved. The light absorption structure is integrated in the packaging structure, and a stray light feedback path is cut off through a physical means on the premise that normal light emitting of a display area and electrical connection of an electrode pad are not affected, so that the optical performance of the micro-projection ray machine is improved, the final display effect is guaranteed, and the display effect is improved. Therefore, the technical problem of image quality degradation caused by high reflectivity of the non-display area is effectively solved.

The invention discloses a laser, visible and infrared portable composite target simulator which comprises a composite light source, a target, a card type optical system and a comprehensive control system. The composite light source adopts an integrating sphere structure, the integrating sphere is provided with a visible light source, an infrared radiation source and a laser fiber interface, the integrating sphere is also provided with an outlet, and the outlet can output a composite light beam; the cassette optical system comprises a secondary mirror and a primary mirror, and the target is arranged on a focal plane of the cassette optical system; the secondary mirror, the primary mirror, the target and the integrating sphere are coaxially arranged in sequence, and the composite light beam is emitted from an outlet of the integrating sphere, passes through the target and finally enters the cassette optical system; the comprehensive control system is connected with the integrating sphere through the visible light source, the infrared radiation source and the laser fiber interface, and is used for controlling the parameters of the laser, the visible light and the infrared radiation source. The device has basic functions of a specific wave band target simulator, can perform function verification on composite detection equipment, and is small in size, capable of being carried by one hand and good in portability.

A design method of an off-axis three-mirror free-form surface imaging system comprises the following steps: according to design values of performance parameters and structure parameters of an optical system, establishing an optical system initial structure consisting of a primary reflector, a secondary reflector and a third reflector as an initial state of iterative calculation of the optical system initial structure; the radiuses, the eccentricity and the inclination of the primary mirror, the secondary mirror and the third mirror are updated in sequence; the initial structure of the optical system meeting the threshold requirement is obtained by judging the evaluation function value MF of the initial structure of the optical system; and by taking the minimum wavefront difference of the optical system as an optimization target, optimizing the obtained initial structure of the optical system by using a damping least square method, and outputting a design result of the optimized optical system. According to the method, the process of repeated iteration adjustment according to the actual engineering space requirement in the conventional design method can be reduced, and the free-form surface off-axis three-mirror optical system meeting the actual engineering space requirement can be conveniently obtained.

To provide a compact, high-performance catadioptric optical system. [Solution] The optical system comprises, in order of light passage from the object side, a primary mirror section consisting of an aspherical concave mirror with its concave surface facing the object side, a secondary mirror section arranged on the object side of the primary mirror section and consisting of an aspherical convex mirror with its convex surface facing the image side, and a refractive system arranged on the image side of the secondary mirror section, the refractive system comprising a front group with positive refractive power and a rear group with negative refractive power separated by a maximum air gap, the refractive system comprising at least five lenses, where PG is the Petzval sum of the refractive system obtained by normalizing the focal length of each surface by the focal length of the entire system, and PM is the Petzval sum of the reflective system obtained by normalizing the focal length of each surface by the focal length of the entire system, 0.6<|PG / PM|<1.2…(1) If the refractive power of the refractive system is φG and the refractive power of the entire system is φ0, then 0.05<|φG / φ0|<1.5…(2) 7 <PM<20…(3) It is characterized by satisfying the conditions (1), (2), and (3).

The invention provides a dual-wavelength coaxial aiming system capable of achieving automatic collimation. The dual-wavelength coaxial aiming system is used for inertial confinement nuclear fusion (ICF) picosecond terminal light path cone target posture adjustment and target spot positioning aiming. The system comprises an automatic collimation light path and an aiming light path with different working wavelengths, the automatic collimation light path comprises a light source, a beam splitter prism, a secondary mirror, a reflector and a CCD detector. The aiming light path consists of a primary mirror, a secondary mirror, a lens group, a beam splitter prism and a CCD (Charge Coupled Device) detector which are coaxial; according to the system, a secondary mirror is multiplexed, and automatic collimation and positioning aiming are achieved through transmission and reflection of different wavelengths; the flint and the crown glass are combined to correct color differences of different wavelengths; dual-wavelength light path image planes are at the same position; the system adopts a coaxial two-reflector structure, and is compact in structure and small in size.

The invention relates to the field of electronic detectors, and discloses a reflective ultrafast scintillation vacuum ultraviolet light imaging detection system and a method thereof.The reflective ultrafast scintillation vacuum ultraviolet light imaging detection system comprises a light path system, a detection and recording component and a structure supporting component, and the light path system is in reflective light path configuration and comprises a primary mirror, a secondary mirror, a correction lens, an integrated filter and a vacuum ultraviolet scintillator; and the vacuum ultraviolet scintillator is made of a PEA2PbBr4 crystal or a BA2PbBr4 crystal. According to the invention, by constructing reflective optical path configuration, the capability of the device in vacuum ultraviolet (VUV) scintillation imaging is successfully shown. The invention not only provides a new solution for reducing the influence of the self-absorption effect in the perovskite scintillator, but also establishes a bridge between the perovskite scintillator and the perovskite scintillator actually applied to ultrafast VUV detection, and opens up a new way for the application of the perovskite material in the field of VUV imaging.

The invention discloses a light and small telescopic unit system based on a peripheral flexible support, relates to the technical field of optical precision instruments, and solves the problems that a conventional telescopic system based on a peripheral support and a back support is insufficient in mirror surface shape precision stability, relatively heavy in weight and relatively long in assembly period. The light and small telescope unit system is composed of a primary mirror assembly, a secondary mirror assembly and a supporting cylinder assembly, the primary mirror assembly comprises a primary mirror and a primary mirror base, and the primary mirror is connected to the interior of the primary mirror base through glue injection; the secondary mirror assembly comprises a secondary mirror, a secondary mirror chamber and a truss, the secondary mirror is connected to the interior of the secondary mirror chamber through glue injection, and the secondary mirror chamber is connected to the truss; the supporting cylinder assembly comprises a supporting cylinder, a first gasket and a second gasket. The two ends of the supporting cylinder assembly are connected with the primary mirror base and the truss respectively. According to the telescopic unit system prepared by the invention, the design of a light, small and peripheral flexible supporting structure is adopted, the stress generated by structural deformation is reduced by utilizing the elastic deformation of the hinge, and the stability of the system is improved.

The invention relates to the technical field of error correction of telescopes, in particular to a spliced telescope sub-mirror co-phase error correction method, which comprises the following steps of: firstly, designing a special mask to ensure that secondary peak values for representing sub-mirror co-phase errors in an MTF (Modulation Transfer Function) under wide-spectrum illumination are not overlapped; therefore, a secondary peak value representing the co-phase error of each sub-mirror in the MTF under the wide spectrum illumination can be calculated respectively, and then the value is used as an evaluation function, and a plurality of correction values to be selected are generated for the co-phase error of the sub-mirror under a certain condition through a population optimization algorithm. A corresponding evaluation function value is obtained through actual correction of the sub-mirror, so that the correction value is evaluated; and the optimal correction value is selected, and repeated iteration is carried out, so that the large-range high-precision real-time correction of the three-dimensional co-phase error of each sub-mirror is realized under the condition that accurate modeling is not carried out on the optical system.

The invention relates to the technical field of spaceflight optical remote sensors, and particularly discloses a calibration method and system for a secondary mirror gasket of a high-resolution space camera, and the method comprises the following steps: 1, carrying out the calibration of a secondary mirror gasket to be repaired in a state that the secondary mirror gasket to be repaired is assembled in the high-resolution space camera; obtaining a first reference point test result of a measurement plane of a secondary mirror installation and adjustment auxiliary tool connected with the secondary mirror structure; 2, when the high-resolution space camera is in the optimal wave aberration state, obtaining a second reference point test result of the measurement plane of the secondary mirror installation and adjustment auxiliary tool connected with the secondary mirror structure; 3, comparing the first reference point test result with the second reference point test result, and calculating to obtain the required grinding thickness of the secondary mirror gasket; and fourthly, the secondary mirror gasket to be repaired is corrected based on the obtained grinding thickness of the secondary mirror gasket. The method is high in calibration efficiency, high in calibration precision and wide in application scene.

The application provides a dual-wavelength coaxial aiming system capable of automatic collimation, which is used for attitude adjustment and target positioning aiming of a picosecond terminal optical path cone target of inertial confinement fusion (ICF). The system comprises automatic collimation optical paths and aiming optical paths of different working wavelengths; the automatic collimation optical paths comprise a light source, a light splitting prism, a secondary mirror, a reflecting mirror and a CCD detector; the aiming optical paths are composed of a primary mirror, a secondary mirror, a lens group, a light splitting prism and a CCD detector group, and each optical element is coaxial; the system multiplexes the secondary mirror, and realizes automatic collimation and positioning aiming through different wavelength transmission and reflection respectively; the system adopts combination of flint and crown glasses to correct chromatic aberration of different wavelengths; the image planes of the dual-wavelength optical paths are located at the same position; and the system adopts a coaxial two-mirror structure, and is compact in structure and small in size.

The invention provides a hyperspectral imaging system. The hyperspectral imaging system comprises a telescope group, a collimator objective, a prism, a volume holographic diffraction grating, an imaging objective and an imaging sensor which are arranged in sequence, the telescope group is composed of a primary reflector, a secondary reflector, a third reflector, a plane reflector and an entrance slit; the primary reflector, the secondary reflector and the third reflector form an off-axis three-reflector structure; the plane reflector is used for folding a light path; the collimating objective lens, the prism, the volume holographic diffraction grating, the imaging objective lens and the imaging sensor form an imaging spectrometer, and an entrance slit is used as object space input; the formed off-axis three-mirror and folded light path and an imaging spectrometer are in coaxial butt joint by taking an entrance slit as a node, and are used for joint correction and splicing to form a hyperspectral imaging system. According to the optical path architecture, optimal matching of the unobstructed total reflection front end and the transmission type rear end is realized, and the detection sensitivity of crop weak spectrum signals is greatly improved while a better modulation transfer function of a full view field is ensured.

The invention relates to the technical field of reflective optics, in particular to an off-axis three-mirror optical system with double folding mirrors, which comprises a primary mirror adopting a concave reflecting mirror and a secondary mirror adopting a convex reflecting mirror, an intermediate image is formed on an output light path of the secondary mirror, and a first folding mirror is arranged at the position of the intermediate image; the first folding mirror folds the light beam from one side of the incident light beam of the primary mirror to the other side, so that the third mirror receives the light beam; the third mirror of the concave reflecting mirror is matched with the primary mirror and the secondary mirror to correct aberration, and a final imaging light beam is generated; a second folding mirror located on an output light path of the third mirror reflects the light beam again, so that the focal plane is close to and higher than the primary mirror; the focal plane is located in an envelope space of the primary mirror and the third mirror; the diaphragm is arranged in an off-axis mode, and the off-axis amount of the diaphragm is 0.3-0.6 times of the diameter of the aperture. According to the invention, the compactness of the off-axis three-mirror optical system is improved through double-folding front and back split arrangement; through focal plane position optimization, the optimized focal plane is higher than the primary mirror.