Cross-scale imaging system for cultural relics in collection of cultural institutions

Abstract

The invention discloses a museum collection cultural relic cross-scale imaging system, and solves the problems that in the prior art, collection devices for extracting digital information of museum collection cultural relics are different in model, different in image resolution, single in imaging scale, lack of spectral information and the like, the extracted digital information is not universal, and the imaging precision is poor. The optical system specifically comprises a lens L1, a lens L2, a lens L3, a lens L4, a lens L5, a diaphragm STO, a lens L6, a lens L7, a lens L8, a lens L9, a lens L10 and a lens L11 which are sequentially arranged from an object space to an image space along an optical axis, wherein the lens L1, the lens L2, the lens L3, the lens L4, the lens L5, the diaphragm STO, the lens L6, the lens L7, the lens L8, the lens L9, the lens L10 and the lens L11 are sequentially arranged from the object space to the image space. According to the method, the ability of autonomously sensing multi-modal information such as textures, materials, local 3D geometry and the like from macroscopic scale to microscopic scale on the surface of a cultural relic body can be realized, so that sensing equipment support is provided for nondestructive extraction and in-situ sensing of cultural relic multi-modal digital fingerprints, and technical support is provided for security management and identity authentication under cultural relic multi-modal digital fingerprints.

Description

Technical Field

[0001] The present invention relates to an imaging system, and particularly to a cross-scale imaging system for collection cultural relics. Background Art

[0002] The transfer and daily management of collection cultural relics are the core links of cultural heritage protection, and their development is closely related to the evolution of the cultural relic protection system. Among them, the transfer of cultural relics covers various forms such as allocation, loan exhibition, donation, and return, involving cross-institutional and cross-regional cooperation; daily management includes all processes such as registration, preservation, restoration, and display. The above work is of great significance for the protection and utilization of collection cultural relics.

[0003] With the improvement of cultural heritage protection awareness and technological progress, the management of cultural relics has gradually transformed towards standardization and scientification, and new models such as smart museums and digital protection have emerged. Under this background, balancing the protection and utilization of cultural relics and improving management efficiency have become key issues in promoting cultural inheritance. In particular, there are still some problems in the current transfer and daily management of collection cultural relics, mainly reflected in: First, the implementation of the system is not strict. The registration and warehousing procedures of cultural relics in some institutions are not standardized, with problems such as inconsistent accounts and physical objects and missing files, making it difficult to trace responsibilities; the procedures for the allocation and loan exhibition of cultural relics are not perfect, with the risk of unauthorized transfer without approval. Second, the preservation conditions do not meet the standards. The facilities in some venues are old, and the temperature and humidity control, dust and insect prevention measures are not in place, resulting in accelerated corrosion and aging of cultural relics; precious cultural relics are not protected in a classified and hierarchical manner, and the phenomenon of mixed storage is common. Third, the technical means are lagging behind. The level of digital management is low, some units still rely on paper files, the information systems are incompatible, and the data sharing and dynamic monitoring capabilities are insufficient. Fourth, the supervision mechanism is lacking. The internal supervision is in the form, the third-party evaluation is absent, and there is no full-process tracking of key links such as the restoration and replication of cultural relics. Fifth, there is a shortage of professional talents. The grass-roots cultural relic protection personnel have a large turnover, the cultural relic identification and restoration technologies are weak, and the emergency handling capabilities are insufficient, which is likely to cause secondary damage. Sixth, the definition of rights and responsibilities is ambiguous. When cross-managing state-owned and private collection cultural relics, disputes are caused due to unclear property rights, and there are blind spots in the supervision of non-state-owned collection cultural relics. The above problems reflect deep-seated contradictions such as insufficient cultural relic protection awareness, scattered capital investment, and inefficient cross-departmental cooperation, and there is an urgent need to systematically optimize the management mechanism. It can be seen that among the above management problems, one of the cores is the lack of a scientific and systematic technical solution for the management of collection cultural relics.

[0004] With the rapid development of science, information technology, digital technology has significantly optimized the management of cultural relics in the collection through full-process empowerment. For example, in the transfer process, technologies such as blockchain and RFID tags are used to achieve unique encoding of the identity of cultural relics and traceability of the transfer path, improving the transparency of the transfer and loan exhibition processes and the approval efficiency; in daily management, high-precision digital archives are established with the help of technologies such as 3D scanning and multispectral imaging to assist in record management, restoration research, and preventive protection. Relying on intelligent databases and the Internet of Things, environmental data such as temperature, humidity, and pests in the warehouse can be monitored in real time, and the preservation conditions can be dynamically regulated. AI algorithms can also be used to analyze the disease characteristics of cultural relics and warn of potential risks. In addition, the digital platform breaks information silos, promotes the sharing of cultural relic resources and collaborative research across institutions, and expands the public display dimension through immersive technologies such as AR / VR, achieving a balance between protection and activation. Among them, for the above digital management issues, one of the most important tasks is the acquisition of digital information of cultural relics in the collection, or the acquisition of digital fingerprints.

[0005] Since the current collection devices for extracting digital information of cultural relics in the collection have different models, there are limitations such as different image resolutions, single imaging scales, and lack of spectral information. The extracted digital information is not universal and cannot be effectively corrected and compared with each other for further identity authentication and other tasks; and there is currently no imaging system that integrates characteristics such as cross-scale, high spatial resolution, high spectral resolution, and multi-modal information acquisition for the safety management and identity authentication of cultural relics in the collection. Summary of the Invention

[0006] In order to solve the technical problems in the prior art that the collection devices for extracting digital information of cultural relics in the collection have different models, there are limitations such as different image resolutions, single imaging scales, and lack of spectral information, and the extracted digital information is not universal and cannot be effectively corrected and compared with each other for further identity authentication and other tasks, the present invention provides a cross-scale imaging system for cultural relics in the collection.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A cross-scale imaging system for cultural relics in the collection, characterized in that: it includes a lens L1, a lens L2, a lens L3, a lens L4, a lens L5, a diaphragm STO, a lens L6, a lens L7, a lens L8, a lens L9, a lens L10, and a lens L11 arranged in sequence from the object side to the image side along the optical axis;

[0009] The lenses L1, L3, L5, L6, L7, L8, and L11 are all negative lenses;

[0010] The lenses L2, L4, L9, and L10 are all positive lenses;

[0011] The lens L4 and the lens L5 are cemented;

[0012] The lens L6 and the lens L7 are cemented;

[0013] The lens L10 and the lens L11 are cemented.

[0014] Furthermore, the object side S1 of the lens L1 is a spherical convex surface, and its image side S2 is a spherical concave surface;

[0015] The object side S3 of the lens L2 is a spherical convex surface, and its image side S4 is a spherical concave surface;

[0016] The object side S5 of the lens L3 is a spherical concave surface, and its image side S6 is a spherical convex surface;

[0017] The object side S7 of the lens L4 is a spherical convex surface, and its image side S8 is a spherical concave surface;

[0018] The object side S9 of the lens L5 is a spherical convex surface, and its image side S10 is a spherical concave surface;

[0019] The object side S12 of the lens L6 is a spherical concave surface, and its image side S13 is a spherical convex surface;

[0020] The object side S14 of the lens L7 is a spherical concave surface, and its image side S15 is a spherical concave surface;

[0021] The object side S16 of the lens L8 is a spherical convex surface, and its image side S17 is a spherical concave surface;

[0022] The object side S18 of the lens L9 is a spherical convex surface, and its image side S19 is a spherical convex surface;

[0023] The object side S20 of the lens L10 is a spherical convex surface, and its image side S21 is a spherical convex surface;

[0024] The object side S22 of the lens L11 is a spherical concave surface, and its image side S23 is a spherical convex surface.

[0025] Furthermore, the radius of curvature of the object side S1 of the lens L1 is 40.36 mm, and the radius of curvature of its image side S2 is 16.64 mm;

[0026] The radius of curvature of the object side S3 of the lens L2 is 17.83 mm, and the radius of curvature of its image side S4 is 55.97 mm;

[0027] The radius of curvature of the object side S5 of the lens L3 is -25.99 mm, and the radius of curvature of its image side S6 is -17.30 mm;

[0028] The radius of curvature of the object side S7 of the lens L4 is 23.50 mm, and the radius of curvature of its image side S8 is 8.06 mm;

[0029] The radius of curvature of the object side S9 of the lens L5 is 8.06 mm, and the radius of curvature of its image side S10 is 46.13 mm;

[0030] The radius of curvature of the object side S12 of the lens L6 is -63.83 mm, and the radius of curvature of its image side S13 is -8.63 mm;

[0031] The radius of curvature of the object side S14 of the lens L7 is -8.63 mm, and the radius of curvature of its image side S15 is 25.65 mm;

[0032] The radius of curvature of the object side S16 of the lens L8 is 24.17 mm, and the radius of curvature of its image side S17 is 15.74 mm;

[0033] The radius of curvature of the object side S18 of the lens L9 is 22.03 mm, and the radius of curvature of its image side S19 is -16.45 mm;

[0034] The radius of curvature of the object side S20 of the lens L10 is 46.20 mm, and the radius of curvature of its image side S21 is -14.13 mm;

[0035] The radius of curvature of the object side S22 of the lens L11 is -14.13 mm, and the radius of curvature of its image side S23 is -212.3 mm.

[0036] Furthermore, the central thickness of the lens L1 is 5.10 mm;

[0037] The central thickness of the lens L2 is 4.00 mm;

[0038] The central thickness of the lens L3 is 5.70 mm;

[0039] The central thickness of the lens L4 is 2.40 mm;

[0040] The central thickness of the lens L5 is 2.90 mm;

[0041] The central thickness of the lens L6 is 2.30 mm;

[0042] The central thickness of the lens L7 is 2.00 mm;

[0043] The central thickness of the lens L8 is 2.00 mm;

[0044] The central thickness of the lens L9 is 4.50 mm;

[0045] The central thickness of the lens L10 is 6.40 mm;

[0046] The central thickness of the lens L11 is 2.00 mm.

[0047] Furthermore, the central distance between the image side S2 of the lens L1 and the object side S3 of the lens L2 is 2.00 mm;

[0048] The central distance between the image side S4 of the lens L2 and the object side S5 of the lens L3 is 9.70 mm;

[0049] The central distance between the image side S6 of the lens L3 and the object side S7 of the lens L4 is 2.60 mm;

[0050] The central distance between the image side S10 of the lens L5 and the diaphragm surface of the diaphragm STO is 13.40 mm;

[0051] The central distance between the diaphragm surface of the diaphragm STO and the object side S12 of the lens L6 is 2.40 mm;

[0052] The central distance between the image side S15 of the lens L7 and the object side S16 of the lens L8 is 2.30 mm;

[0053] The central distance between the image side S17 of the lens L8 and the object side S18 of the lens L9 is 2.30 mm;

[0054] The central distance between the image side S19 of the lens L9 and the object side S20 of the lens L10 is 1.00 mm.

[0055] Furthermore, the d-line refractive index of the lens L1 is 1.5168;

[0056] The d-line refractive index of the lens L2 is 1.6727;

[0057] The d-line refractive index of the lens L3 is 1.497;

[0058] The d-line refractive index of the lens L4 is 1.74;

[0059] The d-line refractive index of the lens L5 is 1.5725;

[0060] The d-line refractive index of the lens L6 is 1.74;

[0061] The d-line refractive index of the lens L7 is 1.713;

[0062] The d-line refractive index of the lens L8 is 1.7469;

[0063] The d-line refractive index of the lens L9 is 1.5691;

[0064] The d-line refractive index of the lens L10 is 1.5725;

[0065] The d-line refractive index of the lens L11 is 1.74.

[0066] Furthermore, the d-line Abbe number of the lens L1 is 64.199;

[0067] The d-line Abbe number of the lens L2 is 32.171;

[0068] The d-line Abbe number of the lens L3 is 81.613;

[0069] The d-line Abbe number of the lens L4 is 28.296;

[0070] The d-line Abbe number of the lens L5 is 57.487;

[0071] The d-line Abbe number of the lens L6 is 28.296;

[0072] The d-line Abbe number of the lens L7 is 53.833;

[0073] The d-line Abbe number of the lens L8 is 50.95;

[0074] The d-line Abbe number of the lens L9 is 71.304;

[0075] The d-line Abbe number of the lens L10 is 57.487;

[0076] The d-line Abbe number of the lens L11 is 28.296.

[0077] Furthermore, the net aperture of the object side S1 of the lens L1 is 9.00 mm, and the net aperture of its image side S2 is 7.60 mm;

[0078] The net aperture of the object side S3 of the lens L2 is 8.40 mm, and the net aperture of its image side S4 is 7.20 mm;

[0079] The net aperture of the object side S5 of the lens L3 is 6.60 mm, and the net aperture of its image side S6 is 7.60 mm;

[0080] The net aperture of the object side S7 of the lens L4 is 7.00 mm, and the net aperture of its image side S8 is 5.60 mm;

[0081] The net aperture of the object side S9 of the lens L5 is 5.60 mm, and the net aperture of its image side S10 is 5.20 mm;

[0082] The net aperture of the diaphragm STO is 3.72 mm;

[0083] The clear aperture of the object side S12 of the lens L6 is 4.60 mm, and the clear aperture of its image side S13 is 4.90 mm;

[0084] The clear aperture of the object side S14 of the lens L7 is 4.90 mm, and the clear aperture of its image side S15 is 4.90 mm;

[0085] The clear aperture of the object side S16 of the lens L8 is 6.50 mm, and the clear aperture of its image side S17 is 7.50 mm;

[0086] The clear aperture of the object side S18 of the lens L9 is 7.50 mm, and the clear aperture of its image side S19 is 6.40 mm;

[0087] The clear aperture of the object side S20 of the lens L10 is 6.40 mm, and the clear aperture of its image side S21 is 7.40 mm;

[0088] The clear aperture of the object side S22 of the lens L11 is 7.40 mm, and the clear aperture of its image side S23 is 7.40 mm.

[0089] Furthermore, the lenses L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, and L11 are made of the same optical glass.

[0090] Advantages of the present invention:

[0091] 1. The cross-scale imaging system for cultural relics in the collection proposed by the present invention can realize the autonomous perception ability of multi-modal information such as texture, material, and local 3D geometry on the surface of the cultural relics from the macroscopic to the microscopic scale, thereby providing support for the perception equipment for the lossless extraction and in-situ perception of the multi-modal digital fingerprints of cultural relics, and providing technical support for the security management and identity authentication under the multi-modal digital fingerprints of cultural relics.

[0092] 2. The cross-scale imaging system for cultural relics in the collection provided by the present invention includes three pairs of cemented lens groups, and the dispersion coefficients of the positive and negative lens materials are quite different, which has good chromatic aberration, off-axis aberration, and astigmatism correction functions for wide-spectrum imaging detection, and the cemented parts can effectively reduce the requirements for the sensitivity of processing tolerances. Description of the Drawings

[0093] Figure 1 is a schematic structural diagram of an embodiment of a cross-scale imaging system for cultural relics in the collection of the present invention;

[0094] Figure 2 is a modulation transfer function (MTF) curve graph of the cross-scale imaging system for cultural relics in the collection under the condition of the light flux F / 4.5 in the embodiment of the present invention;

[0095] Figure 3 is a spherical aberration curve diagram of the cross-scale imaging system of the museum cultural relics under the condition of light transmission F / 4.5 in the embodiment of the present invention;

[0096] Figure 4 : are field curvature and distortion diagrams of the cross-scale imaging system for museum cultural relics in an embodiment of the present invention; wherein (a) is a field curvature diagram, and (b) is a distortion diagram;

[0097] Figure 5 3 is a point array diagram of the cross-scale imaging system of the museum cultural relics in the embodiment of the present invention; wherein, (a) is the diffuse spot array diagram at 0 field of view, (b) is the diffuse spot array diagram at 0.707 field of view, (c) is the diffuse spot array diagram at 1 field of view, and (d) is the diffuse spot array diagram at -1 field of view; in the figure, the RMS radius of the diffuse spot at 0 field of view is 4.202μm, the RMS radius of the diffuse spot at 0.707 field of view is 3.682μm, the RMS radius of the diffuse spot at 1 field of view is 1.962μm, and the RMS radius of the diffuse spot at -1 field of view is 1.962μm. DETAILED DESCRIPTION

[0098] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0099] For the acquisition of multimodal digital information of cultural relics in museums, considering the diversity of cultural relics types and structures, it is necessary to grasp the macro and micro information of cultural relics as comprehensively as possible, that is, to obtain high-quality multimodal optical data at multiple scales from macro to micro. Therefore, cross-scale optical imaging design, or the optomechanical dynamic adjustment mechanism of cross-scale imaging observation is very important. In engineering development, it is necessary to realize how to control the rapid movement of the lens through devices such as high-resolution stepper motors and high-precision lead screws to achieve rapid adjustment of the relative position of the lens and camera, thereby completing the change of imaging magnification.

[0100] The scenario of multimodal information acquisition in hyperspectral archaeological detection and cultural relics protection is the irradiation scenario of low-temperature visible near-infrared integrated light source. The docking detector uses a wide-spectrum detector with a pixel number of 1920 and a pixel size of 2.1. Its effective detection spectrum is 400nm-950nm, and the effective field of view type is image height, that is, the target size of the image plane wide spectrum detector. The specific size is 4.032mm image height, that is, image plane wide spectrum, the diagonal length D is 4.626mm, and the imaging spatial resolution requirement is proposed to be 5μm@50mm.

[0101] For the above cross-scale optical imaging system design, there are usually two schemes: the zoom scheme and the fixed-focus scheme.

[0102] Optical zoom changes the focal length by changing the relative positions of the lenses inside the lens. This zoom method changes the distance that light travels. Its advantages include: (1) Clear images. Optical zoom can maintain the clarity and details of the images because the images are not digitally processed during the zoom process; (2) Continuously adjustable focal length. The focal length of optical zoom can be continuously adjusted within a certain range, enabling the photographer to conveniently adjust the shooting field of view and the size of the image. (3) Wide application range: Whether it is small-scale monitoring indoors or large-scale surveillance outdoors, optical zoom can adapt to different scenarios and requirements; (4) By changing the focal length to adjust the imaging size and viewing angle, thereby affecting the depth of field and the clarity range.

[0103] The fixed-focus imaging system mainly refers to a system with a fixed focal length. When the focal length is fixed, the scene in front cannot be directly zoomed in or out. Its field of view angle is determined, but by adjusting the back focal length, changes in the absolute field of view and spatial resolution can be achieved. Its characteristics are: relatively simple design, fewer lenses, and a stable optical system. Its advantages are: (1) High imaging quality. Due to the simple design, fixed-focus lenses are usually superior to zoom lenses in terms of imaging quality, with higher optical quality and the ability to reduce various problems such as aberrations, distortions, and glares. (2) The focusing mechanism of the fixed-focus system is relatively simple, so the focusing speed is faster. This is particularly important for shooting moving objects or capturing dynamic instantaneous images. (3) Compared with zoom lenses, fixed-focus lenses are usually smaller in size and lighter in weight.

[0104] According to the actual application requirements of cross-scale imaging observation of cultural relics in the collection, it is necessary to ensure that the close-range observation is microscopically clear, the long-range observation has a large field of view, and the probe structure needs to be light and small to meet the portable use in various scenarios. Therefore, the fixed-focus scheme is more reasonable and practical.

[0105] Therefore, the cross-scale imaging system for cultural relics in the collection provided in this embodiment can ensure the autonomous perception ability of multi-modal information such as textures, materials, and local 3D geometries of the surface of cultural relics in the collection from the macroscopic to the microscopic scale during actual application. Its focal length is 36.2 mm, it is adapted to a maximum light flux of F / 4.5, and it is adapted to a spectral chip target surface size with a pixel size of 2.1 pixel sizes and a pixel number of 1920×1080.

[0106] Such as Figure 1As shown in the figure, the cross-scale imaging system for the museum collection cultural relics includes a lens L1, a lens L2, a lens L3, a lens L4, a lens L5, a stop STO, a lens L6, a lens L7, a lens L8, a lens L9, a lens L10, and a lens L11 arranged in sequence along the optical axis from the object side to the image side; finally, it points to the image plane IMG, that is, the position where the spectral imaging chip is located.

[0107] Table 1 lists the lens data and position relationships of the cross-scale imaging system for the museum collection cultural relics. In Table 1, the object side surface of lens L1 is denoted as surface S1, and other light-transmitting surfaces (including the plane where the aperture stop STO is located) are numbered in ascending order along the incident optical axis direction. "Radius of curvature R" represents the vertex paraxial curvature radius value of a surface. For the lens between the i-th surface S i and the (i + 1)-th surface S i+1 : its "thickness" is the thickness along the optical axis, and its "refractive index Nd" and "Abbe number Nd" are the measured values at the d-line (test wavelength 587.6 nm). For two adjacent lenses, the distance between the image side surface of the previous lens and the object side surface of the next lens on the incident optical axis is called the optical axis distance between the two.

[0108] The main parameters of each glass lens are detailed as follows:

[0109] Lens L1 is a positive lens. The object side surface S1 of lens L1 is a spherical convex surface, and its image side surface S2 is a spherical concave surface; the radius of curvature of the object side surface S1 of lens L1 is 40.36 mm, and the radius of curvature of its image side surface S2 is 16.64 mm; the central thickness of lens L1 is 5.10 mm; the central distance between the image side surface S2 of lens L1 and the object side surface S3 of lens L2 is 2.00 mm; the d-line refractive index of lens L1 is 1.5168; the d-line Abbe number of lens L1 is 64.199; the clear aperture of the object side surface S1 of lens L1 is 9.00 mm, and the clear aperture of its image side surface S2 is 7.60 mm.

[0110] Lens L2 is a positive lens; the object side surface S3 of lens L2 is a spherical convex surface, and its image side surface S4 is a spherical concave surface; the radius of curvature of the object side surface S3 of lens L2 is 17.83 mm, and the radius of curvature of its image side surface S4 is 55.97 mm; the central thickness of lens L2 is 4.00 mm; the central distance between the image side surface S4 of lens L2 and the object side surface S5 of lens L3 is 9.70 mm; the d-line refractive index of lens L2 is 1.6727; the d-line Abbe number of lens L2 is 32.171; the clear aperture of the object side surface S3 of lens L2 is 8.40 mm, and the clear aperture of its image side surface S4 is 7.20 mm.

[0111] Lens L3 is a negative lens; the object side S5 of lens L3 is a spherical concave surface, and its image side S6 is a spherical convex surface; the radius of curvature of the object side S5 of lens L3 is -25.99 mm, and the radius of curvature of its image side S6 is -17.30 mm; the central thickness of lens L3 is 5.70 mm; the center-to-center distance between the image side S6 of lens L3 and the object side S7 of lens L4 is 2.60 mm; the d-line refractive index of lens L3 is 1.497; the d-line Abbe number of lens L3 is 81.613; the clear aperture of the object side S5 of lens L3 is 6.60 mm, and the clear aperture of its image side S6 is 7.60 mm.

[0112] Lens L4 is a positive lens; the object side S7 of lens L4 is a spherical convex surface, and its image side S8 is a spherical concave surface; the radius of curvature of the object side S7 of lens L4 is 23.50 mm, and the radius of curvature of its image side S8 is 8.06 mm; the central thickness of lens L4 is 2.40 mm; the d-line refractive index of lens L4 is 1.74; the d-line Abbe number of lens L4 is 28.296; the clear aperture of the object side S7 of lens L4 is 7.00 mm, and the clear aperture of its image side S8 is 5.60 mm; lens L4 and lens L5 are cemented.

[0113] Lens L5 is a negative lens; the object side S9 of lens L5 is a spherical convex surface, and its image side S10 is a spherical concave surface; the radius of curvature of the object side S9 of lens L5 is 8.06 mm, and the radius of curvature of its image side S10 is 46.13 mm; the central thickness of lens L5 is 2.90 mm; the center-to-center distance between the image side S10 of lens L5 and the diaphragm plane of the diaphragm STO is 13.40 mm; the d-line refractive index of lens L5 is 1.5725; the d-line Abbe number of lens L5 is 57.487; the clear aperture of the object side S9 of lens L5 is 5.60 mm, and the clear aperture of its image side S10 is 5.20 mm.

[0114] The center-to-center distance between the diaphragm plane of the diaphragm STO and the object side S12 of lens L6 is 2.40 mm; the clear aperture of the diaphragm STO is 3.72 mm.

[0115] Lens L6 is a negative lens; the object side S12 of lens L6 is a spherical concave surface, and its image side S13 is a spherical convex surface; the radius of curvature of the object side S12 of lens L6 is -63.83 mm, and the radius of curvature of its image side S13 is -8.63 mm; the central thickness of lens L6 is 2.30 mm; the d-line refractive index of lens L6 is 1.74; the d-line Abbe number of lens L6 is 28.296; the clear aperture of the object side S12 of lens L6 is 4.60 mm, and the clear aperture of its image side S13 is 4.90 mm; lens L6 and lens L7 are cemented.

[0116] Lens L7 is a negative lens; the object side S14 of lens L7 is a spherical concave surface, and its image side S15 is a spherical concave surface; the radius of curvature of the object side S14 of lens L7 is -8.63 mm, and the radius of curvature of its image side S15 is 25.65 mm; the central thickness of lens L7 is 2.00 mm; the center-to-center distance between the image side S15 of lens L7 and the object side S16 of lens L8 is 2.30 mm; the d-line refractive index of lens L7 is 1.713; the d-line Abbe number of lens L7 is 53.833; the clear aperture of the object side S14 of lens L7 is 4.90 mm, and the clear aperture of its image side S15 is 4.90 mm.

[0117] Lens L8 is a negative lens; the object side S16 of lens L8 is a spherical convex surface, and its image side S17 is a spherical concave surface; the radius of curvature of the object side S16 of lens L8 is 24.17 mm, and the radius of curvature of its image side S17 is 15.74 mm; the central thickness of lens L8 is 2.00 mm; the center-to-center distance between the image side S17 of lens L8 and the object side S18 of lens L9 is 2.30 mm; the d-line refractive index of lens L8 is 1.7469; the d-line Abbe number of lens L8 is 50.95; the clear aperture of the object side S16 of lens L8 is 6.50 mm, and the clear aperture of its image side S17 is 7.50 mm.

[0118] Lens L9 is a positive lens; the object side S18 of lens L9 is a spherical convex surface, and its image side S19 is a spherical convex surface; the radius of curvature of the object side S18 of lens L9 is 22.03 mm, and the radius of curvature of its image side S19 is -16.45 mm; the central thickness of lens L9 is 4.50 mm; the center-to-center distance between the image side S19 of lens L9 and the object side S20 of lens L10 is 1.00 mm. The d-line refractive index of lens L9 is 1.5691; the d-line Abbe number of lens L9 is 71.304; the clear aperture of the object side S18 of lens L9 is 7.50 mm, and the clear aperture of its image side S19 is 6.40 mm.

[0119] Lens L10 is a positive lens; the object side S20 of lens L10 is a spherical convex surface, and its image side S21 is a spherical convex surface; the radius of curvature of the object side S20 of lens L10 is 46.20 mm, and the radius of curvature of its image side S21 is -14.13 mm; the central thickness of lens L10 is 6.40 mm; the d-line refractive index of lens L10 is 1.5725; the d-line Abbe number of lens L10 is 57.487; the clear aperture of the object side S20 of lens L10 is 6.40 mm, and the clear aperture of its image side S21 is 7.40 mm; lens L10 and lens L11 are cemented.

[0120] The lens L11 is a negative lens; the object side S22 of the lens L11 is a spherical concave surface, and its image side S23 is a spherical convex surface. The radius of curvature of the object side S22 of the lens L11 is -14.13 mm, and the radius of curvature of its image side S23 is -212.3 mm. The central thickness of the lens L11 is 2.00 mm. The refractive index of the d-line of the lens L11 is 1.74. The Abbe number of the d-line of the lens L11 is 28.296. The clear aperture of the object side S22 of the lens L11 is 7.40 mm, and the clear aperture of its image side S23 is 7.40 mm.

[0121] The image plane IMG is the location where the spectral imaging chip is located, with a clear aperture of 2.35 mm, and the distance from the optical axis of the lens L11 (i.e., the last lens) is approximately 36.23 mm.

[0122] Table 1 Lens data and its specific positional relationship

[0123]

[0124]

[0125] Figure 2 is the modulation transfer function (MTF) curve graph of the cross-scale imaging system for the cultural relics in this collection under the condition of the light throughput F / 4.5. From Figure 2 it can be seen that the MTF values of the ten meridional and sagittal curves representing different fields of view basically decrease uniformly in the full frequency range, and the overall convergence trend of the curves is smooth, with good concentration. At the cut-off frequency of 240 lp / mm, the MTF curves of each field of view are ≥0.13, all approaching the diffraction limit, fully demonstrating the excellent imaging detection performance of the imaging system.

[0126] Figure 3 is the spherical aberration curve graph of the cross-scale imaging system for the cultural relics in this collection under the condition of the light throughput F / 4.5. From Figure 3 it can be seen that the on-axis pupil aberration is evenly distributed, with a maximum value of 0.1 mm, and the spherical aberration of the main detection spectral band is well controlled.

[0127] Figure 4 is the field curvature and distortion graph of the cross-scale imaging system for the cultural relics in this collection. From Figure 4 it can be seen that the field curvature of this imaging system is evenly distributed, and the maximum distortion within the full field of view is 0.12%, meeting the detection index requirements of the project.

[0128] Figure 5 is the spot diagram of the cross-scale imaging system for the cultural relics in this collection. The RMS radius of the Airy disk of this imaging system is 3.719 μm. From the information in the figure, it can be seen that the radius of the blur spot under each field of view is less than the spatial resolution requirement, and all approach the Airy disk radius. The imaging effect approaches the diffraction limit, and the imaging performance of the optical system meets the index requirements. From Figure 5It can be seen that the diameter of the blur spot in most fields of view of the imaging system does not exceed the diameter of the Airy disk, and the imaging quality approaches the diffraction limit, meeting the detection requirements of the project indicators.

[0129] Since multiple pixels are used as supplements to the spectral channels, the overall spatial resolution of the system will inevitably decrease. In the later stage, processing means such as computational optics can be introduced to improve the edge recognition ability of the acquired images, thereby improving the spatial resolution. At the same time, the spectral information of the spectral bands obtained by spectral reconstruction processing can also be used to improve the spectral resolution.

[0130] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cross-scale imaging system for museum collections, characterized by: It includes lens L1, lens L2, lens L3, lens L4, lens L5, aperture STO, lens L6, lens L7, lens L8, lens L9, lens L10 and lens L11 which are arranged in sequence from the object side to the image side along the optical axis; The lens L1, lens L3, lens L5, lens L6, lens L7, lens L8, and lens L11 are all negative lenses; The lens L2, lens L4, lens L9 and lens L10 are all positive lenses; The lens L4 and the lens L5 are glued together; The lens L6 and the lens L7 are glued together; The lens L10 and the lens L11 are cemented together.

2. The cross-scale imaging system for museum cultural relics according to claim 1, characterized in that: The object side surface S1 of the lens L1 is a spherical convex surface, and the image side surface S2 is a spherical concave surface; The object side surface S3 of the lens L2 is a spherical convex surface, and the image side surface S4 is a spherical concave surface; The object side surface S5 of the lens L3 is a spherical concave surface, and the image side surface S6 is a spherical convex surface; The object side surface S7 of the lens L4 is a spherical convex surface, and the image side surface S8 is a spherical concave surface; The object side surface S9 of the lens L5 is a spherical convex surface, and the image side surface S10 is a spherical concave surface; The object side surface S12 of the lens L6 is a spherical concave surface, and the image side surface S13 is a spherical convex surface; The object side surface S14 of the lens L7 is a spherical concave surface, and the image side surface S15 is a spherical concave surface; The object side surface S16 of the lens L8 is a spherical convex surface, and the image side surface S17 is a spherical concave surface; The object side surface S18 of the lens L9 is a spherical convex surface, and the image side surface S19 is a spherical convex surface; The object side surface S20 of the lens L10 is a spherical convex surface, and the image side surface S21 thereof is a spherical convex surface; The object side surface S22 of the lens L11 is a spherical concave surface, and the image side surface S23 is a spherical convex surface.

3. The cross-scale imaging system for museum cultural relics according to claim 2, characterized in that: The object side surface S1 of the lens L1 has a curvature radius of 40.36 mm, and the image side surface S2 has a curvature radius of 16.64 mm; The object side surface S3 of the lens L2 has a curvature radius of 17.83 mm, and the image side surface S4 has a curvature radius of 55.97 mm; The object side surface S5 of the lens L3 has a curvature radius of -25.99 mm, and the image side surface S6 has a curvature radius of -17.30 mm; The object side surface S7 of the lens L4 has a curvature radius of 23.50 mm, and the image side surface S8 has a curvature radius of 8.06 mm; The object side surface S9 of the lens L5 has a curvature radius of 8.06 mm, and the image side surface S10 has a curvature radius of 46.13 mm; The object side surface S12 of the lens L6 has a curvature radius of -63.83 mm, and the image side surface S13 has a curvature radius of -8.63 mm; The object side surface S14 of the lens L7 has a curvature radius of -8.63 mm, and the image side surface S15 has a curvature radius of 25.65 mm; The object side surface S16 of the lens L8 has a curvature radius of 24.17 mm, and the image side surface S17 has a curvature radius of 15.74 mm; The object side surface S18 of the lens L9 has a curvature radius of 22.03 mm, and the image side surface S19 has a curvature radius of -16.45 mm; The object side surface S20 of the lens L10 has a curvature radius of 46.20 mm, and the image side surface S21 has a curvature radius of -14.13 mm; The object-side surface S22 of the lens L11 has a curvature radius of -14.13 mm, and the image-side surface S23 has a curvature radius of -212.3 mm.

4. The cross-scale imaging system for museum cultural relics according to claim 3, characterized in that: The center thickness of the lens L1 is 5.10 mm; The center thickness of the lens L2 is 4.00 mm; The center thickness of the lens L3 is 5.70 mm; The central thickness of the lens L4 is 2.40 mm; The center thickness of the lens L5 is 2.90 mm; The center thickness of the lens L6 is 2.30 mm; The center thickness of the lens L7 is 2.00 mm; The center thickness of the lens L8 is 2.00 mm; The center thickness of the lens L9 is 4.50 mm; The central thickness of the lens L10 is 6.40 mm; The central thickness of the lens L11 is 2.00 mm.

5. The cross-scale imaging system for museum cultural relics according to claim 4, characterized in that: The center distance between the image side surface S2 of the lens L1 and the object side surface S3 of the lens L2 is 2.00 mm; The center distance between the image side surface S4 of the lens L2 and the object side surface S5 of the lens L3 is 9.70 mm; The center distance between the image side surface S6 of the lens L3 and the object side surface S7 of the lens L4 is 2.60 mm; The center distance between the image side surface S10 of the lens L5 and the stop surface center of the stop STO is 13.40 mm; The center distance between the stop surface of the stop STO and the object side surface S12 of the lens L6 is 2.40 mm; The center distance between the image side surface S15 of the lens L7 and the object side surface S16 of the lens L8 is 2.30 mm; the center distance between the image side surface S17 of the lens L8 and the object side surface S18 of the lens L9 is 2.30 mm; the center distance between the image side surface S19 of the lens L9 and the object side surface S20 of the lens L10 is 1.00 mm.

6. The cross-scale imaging system for museum cultural relics according to claim 5, characterized in that: The d-line refractive index of the lens L1 is 1.5168; The d-line refractive index of the lens L2 is 1.6727; The d-line refractive index of the lens L3 is 1.497; The d-line refractive index of the lens L4 is 1.74; The d-line refractive index of the lens L5 is 1.5725; The d-line refractive index of the lens L6 is 1.74; The d-line refractive index of the lens L7 is 1.713; The d-line refractive index of the lens L8 is 1.7469; The d-line refractive index of the lens L9 is 1.5691; The d-line refractive index of the lens L10 is 1.5725; The d-line refractive index of the lens L11 is 1.

74.

7. The cross-scale imaging system for museum cultural relics according to claim 6, characterized in that: The d-line Abbe number of the lens L1 is 64.199; The d-line Abbe number of the lens L2 is 32.171; The d-line Abbe number of the lens L3 is 81.613; The d-line Abbe number of the lens L4 is 28.296; The d-line Abbe number of the lens L5 is 57.487; The d-line Abbe number of the lens L6 is 28.296; The d-line Abbe number of the lens L7 is 53.833; The d-line Abbe number of the lens L8 is 50.95; The d-line Abbe number of the lens L9 is 71.304; The d-line Abbe number of the lens L10 is 57.487; The d-line Abbe number of the lens L11 is 28.

296.

8. The cross-scale imaging system for museum cultural relics according to claim 7, characterized in that: The clear aperture of the object side S1 of the lens L1 is 9.00 mm, and the clear aperture of the image side S2 is 7.60 mm; The clear aperture of the object side S3 of the lens L2 is 8.40 mm, and the clear aperture of the image side S4 is 7.20 mm; The clear aperture of the object side S5 of the lens L3 is 6.60 mm, and the clear aperture of the image side S6 is 7.60 mm; The clear aperture of the object side S7 of the lens L4 is 7.00 mm, and the clear aperture of the image side S8 is 5.60 mm; The clear aperture of the object side S9 of the lens L5 is 5.60 mm, and the clear aperture of the image side S10 is 5.20 mm; The clear aperture of the aperture STO is 3.72 mm; The clear aperture of the object side S12 of the lens L6 is 4.60 mm, and the clear aperture of the image side S13 is 4.90 mm; The clear aperture of the object side S14 of the lens L7 is 4.90 mm, and the clear aperture of the image side S15 is 4.90 mm; The clear aperture of the object side S16 of the lens L8 is 6.50 mm, and the clear aperture of the image side S17 is 7.50 mm; The clear aperture of the object side S18 of the lens L9 is 7.50 mm, and the clear aperture of the image side S19 is 6.40 mm; The clear aperture of the object side surface S20 of the lens L10 is 6.40 mm, and the clear aperture of the image side surface S21 thereof is 7.40 mm; The clear aperture of the object side surface S22 of the lens L11 is 7.40 mm, and the clear aperture of the image side surface S23 thereof is 7.40 mm.

9. The cross-scale imaging system for museum cultural relics according to claim 8, characterized in that: The lens L1, lens L2, lens L3, lens L4, lens L5, lens L6, lens L7, lens L8, lens L9, lens L10 and lens L11 are made of the same optical glass.

Images