Optical assembly and space debris wide-area detection optical system

Abstract

The optical assembly provided by the embodiment of the present application comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are coaxially arranged in sequence along the light incidence direction, and light passes through the lenses to reach a focal plane, the field of view of the optical assembly is greater than 28 degrees, the entrance pupil diameter is greater than 180 mm, the spectral range is 500 nm-900 nm, the maximum distortion is not more than 0.02%, and the precise distortion calibration on the ground or in orbit is not needed, so that the data processing system calculation amount and time are reduced, data correlation errors are not caused when multiple devices are observed, and the detection efficiency and accuracy of the space debris wide-area detection are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, in particular to an optical assembly and a space debris wide-area detection optical system. BACKGROUND

[0002] Space debris refers to objects that revolve around the earth and move in space according to a certain orbit, such as boosters, protective covers, satellite debris, failed satellites, etc. The collision of space debris with a spacecraft can directly change the surface properties of the satellite, cause damage to the surface of the spacecraft, lead to system failure of the spacecraft, and cause great harm to the on-orbit operation of the spacecraft. With the increasing frequency of human space activities, the number of space debris is increasing, making the space environment deteriorating. In order to ensure space safety and spacecraft safety, it is necessary to detect, catalog, and orbit space debris.

[0003] At present, the distortion of the space debris detection optical system is large, which leads to the decline of the positioning and orbiting accuracy of the observed debris target. Precise distortion calibration needs to be carried out on the ground or in orbit, which increases the calculation amount and time of the data processing system and affects the real-time performance of debris observation. And when multiple devices are observed, it will lead to data association errors, and the observation points in different images cannot be correctly attributed to the same debris, forming false trajectories. Therefore, it is urgent to provide an optical assembly with high efficiency and low distortion. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide an optical assembly and a space debris wide-area detection optical system to improve the detection efficiency and accuracy of space debris wide-area detection. The specific technical solutions are as follows:

[0005] In a first aspect, the present application provides an optical assembly, which is coaxially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence along the light incident direction, and light passes through each lens to reach a focal plane; the entrance pupil diameter D of the optical assembly satisfies: 180mm;

[0006] The refractive index of the first lens The refractive index of the second lens The refractive index of the third lens The refractive index of the fourth lens The refractive index of the fifth lens The refractive index of the sixth lens The refractive index of the seventh lens The refractive index of the eighth lens satisfies: 1.41 1.54, 1.45 1.57, 1.47 1.56, 1.41 1.53, 1.42 1.58, 1.55 1.75, 1.44 1.52, 1.41 1.51;

[0007] Abbe number of the first lens Abbe number of the second lens Abbe number of the third lens Abbe number of the fourth lens Abbe number of the fifth lens Abbe number of the sixth lens Abbe number of the seventh lens Abbe number of the eighth lens satisfies: 60 70, 55 68, 71 93, 80 95, 75 95, 31 56, 80 92, 55 85;

[0008] focal length of the first lens focal length of the second lens focal length of the third lens focal length of the fourth lens focal length of the fifth lens focal length of the sixth lens focal length of the seventh lens focal length of the eighth lens focal length of the optical assembly satisfies: -4.1f -2.79f, -3.51f -2.01f, 0.9f 1.52f, 22f 33f, 0.85f 1.43f, -1.18f -0.83f, 0.9f 1.13f, -0.9f -0.63f;

[0009] incident surface radius of curvature of the first lens and exit surface radius of curvature the radius of curvature of the entrance face of the second lens and the radius of curvature of the exit face the radius of curvature of the entrance face of the third lens and the radius of curvature of the exit face the radius of curvature of the entrance face of the fourth lens and the radius of curvature of the exit face the radius of curvature of the entrance face of the fifth lens and the radius of curvature of the exit face the radius of curvature of the exit face of the sixth lens the radius of curvature of the entrance face of the seventh lens and the radius of curvature of the exit face the radius of curvature of the entrance face of the eighth lens satisfies: -2.51f -1.12f, -42f -22f, -7.21f -4.1f, , -3.39f -1.78f, 0.37f 0.53f, 0.39f 0.54f, 0.48f 0.59f, -1.69f -1.46f, 0.49f 0.65f, 0.42f 0.62f, -6.9f -3.9f, -0.52f -0.15f;

[0010] The components with optical power in the optical assembly are only the above eight lenses.

[0011] In a possible implementation, the central thickness of the first lens the central thickness of the second lens the central thickness of the third lens the central thickness of the fourth lens the central thickness of the fifth lens the central thickness of the sixth lens the central thickness of the seventh lens and the central thickness of the eighth lens satisfies: 25mm 37mm, 20mm 45mm, 45mm 65mm, 35mm 55mm, 40mm 70mm, 11mm 30mm, 45mm 60mm, 10mm 25mm.

[0012] In a possible implementation, the interval distance between the first lens and the second lens , the interval distance between the second lens and the third lens , the interval distance between the third lens and the fourth lens , the interval distance between the fourth lens and the fifth lens , the interval distance between the fifth lens and the sixth lens , the interval distance between the sixth lens and the seventh lens , the interval distance between the seventh lens and the eighth lens , and the interval distance between the eighth lens and the image surface satisfy: 7mm 16mm, 0.1mm 3mm, 15mm 30mm, 35mm 45mm, 3mm 12mm, 40mm 73mm, 150mm 270mm, 2mm 20mm.

[0013] In a possible implementation, the material of the lens is radiation-resistant optical glass.

[0014] In a possible implementation, the exit surface of the first lens, the entrance surface of the fourth lens, the entrance surface of the sixth lens, and the exit surface of the eighth lens are all high-order aspheric surfaces, and the second lens, the third lens, the fifth lens, and the seventh lens are all double-spherical lenses.

[0015] In a possible implementation, the first lens has an entrance surface with a radius of curvature of -647.35 mm and an exit surface with a radius of curvature of -14800 mm; the second lens has an entrance surface with a radius of curvature of -2185.99 mm; the third lens has an exit surface with a radius of curvature of -871.39 mm; the fourth lens has an entrance surface with a radius of curvature of 207.71 mm and an exit surface with a radius of curvature of 201.60 mm; the fifth lens has an entrance surface with a radius of curvature of 233.41 mm and an exit surface with a radius of curvature of -648.83 mm; the sixth lens has an exit surface with a radius of curvature of 241.58 mm; the seventh lens has an entrance surface with a radius of curvature of 219.43 mm and an exit surface with a radius of curvature of -1910.62 mm; and the eighth lens has an entrance surface with a radius of curvature of -159.48 mm.

[0016] In a possible implementation, the exit surface of the first lens, the entrance surface of the fourth lens, the entrance surface of the sixth lens, and the exit surface of the eighth lens satisfy:

[0017] ;

[0018] where c is the curvature of the aspheric surface, r the aperture of the aspheric surface, K the quadratic surface coefficient of the aspheric surface, and A, B, C, D, E, and F the coefficients of each order of the aspheric surface.

[0019] For the exit surface of the first lens, K=0, A=8.0355e-009, B=3.8286e-014, C=3.6753e-019, and D=2.0498e-023.

[0020] For the entrance surface of the fourth lens, K=-0.0803, A=3.4633e-009, B=1.1175e-013, C=-5.6443e-019, and D=2.3434e-022.

[0021] For the entrance surface of the sixth lens, K=0, A=-1.5623e-008, B=-2.9486e-013, C=3.69e-019, and D=-2.8707e-022.

[0022] For the exit surface of the eighth lens, K=0, A=2.77711e-008, B=-1.7e-012, and C=5.73e-017.

[0023] In a possible implementation, the entrance surface of the sixth lens and the exit surface of the eighth lens are both planar.

[0024] In a possible implementation, the optical assembly has an entrance pupil diameter D of 200 mm.

[0025] In a second aspect, the embodiments of the present application provide a space debris wide-area detection optical system, which comprises the optical assembly of any one of the first aspect.

[0026] The embodiments of the present application have the following beneficial effects:

[0027] The optical assembly and the space debris wide-area detection optical system provided by the embodiments of the present application have the following beneficial effects: the optical assembly has a field of view angle greater than 28°, an entrance pupil diameter greater than 180 mm, and a spectral range of 500 nm-900 nm, so that the maximum distortion is not more than 0.02%, without the need for precise distortion calibration on the ground or in orbit, the data processing system calculation amount and time are reduced, data correlation errors are not caused when multiple devices are observed, and the detection efficiency and accuracy of the space debris wide-area detection are improved.

[0028] Of course, implementing any product or method of the present application does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other embodiments can also be obtained from these drawings.

[0030] Figure 1 The structural schematic diagram of the optical assembly provided by the embodiments of the present application;

[0031] Figure 2a The first kind of schematic diagram of the energy concentration degree curve of the optical assembly provided by the embodiments of the present application;

[0032] Figure 2b The second kind of schematic diagram of the energy concentration degree curve of the optical assembly provided by the embodiments of the present application;

[0033] Figure 3a The first kind of schematic diagram of the aberration curve of the optical assembly provided by the embodiments of the present application;

[0034] Figure 3b The second kind of schematic diagram of the aberration curve of the optical assembly provided by the embodiments of the present application. DETAILED DESCRIPTION

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of the present invention.

[0036] This invention provides an optical component, see [link to relevant documentation]. Figure 1 , Figure 1 This is a schematic diagram of the structure of an optical component provided in an embodiment of the present invention. The optical component includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, and an eighth lens 108 arranged coaxially along the incident direction of light. Light passes through each lens to reach the focal plane. The entrance pupil diameter D of the optical component satisfies: 180mm.

[0037] The refractive index of the first lens 101 Satisfies: 1.41 1.54, the Abbe number of the first lens 101 Satisfaction: 60 70, the focal length of the first lens 101 Focal length of optical components Satisfy: -4.1f -2.79f, the radius of curvature of the incident surface of the first lens 101 and the radius of curvature of the exit surface Satisfy: -2.51f -1.12f, -42f -22f;

[0038] The refractive index of the second lens 102 Satisfies: 1.45 1.57, the Abbe number of the second lens 102 Satisfaction: 55 68, Focal length of the second lens 102 Focal length of optical components Satisfy: -3.51f -2.01f, the radius of curvature of the incident surface of the second lens 102. and the radius of curvature of the exit surface Satisfies: -7.21f -4.1f, ;

[0039] The refractive index of the third lens 103 Satisfaction: 1.47 1.56, Abbe number of the third lens 103 satisfies: 71 93, focal length of the third lens 103 with the focal length of the optical assembly satisfies: 0.9f 1.52f, radius of curvature of the entrance surface of the third lens 103 and the exit surface satisfies: , -3.39f -1.78f;

[0040] refractive index of the fourth lens 104 satisfies: 1.41 1.53, Abbe number of the fourth lens 104 satisfies: 80 95, focal length of the fourth lens 104 with the focal length of the optical assembly satisfies: 22f 33f, radius of curvature of the entrance surface of the fourth lens 104 and the exit surface satisfies: 0.37f 0.53f, 0.39f 0.54f;

[0041] refractive index of the fifth lens 105 satisfies: 1.42 1.58, Abbe number of the fifth lens 105 satisfies: 75 95, focal length of the fifth lens 105 with the focal length of the optical assembly satisfies: 0.85f 1.43f, radius of curvature of the entrance surface of the fifth lens 105 and the exit surface satisfies: 0.48f 0.59f, -1.69f -1.46f;

[0042] refractive index of the sixth lens 106 satisfies: 1.55 1.75, Abbe number of the sixth lens 106 satisfies: 31 56, focal length of the sixth lens 106 with the focal length of the optical assembly satisfies: -1.18f -0.83f, radius of curvature of the exit surface of the sixth lens 106 satisfies: 0.49f 0.65f;

[0043] refractive index of the seventh lens 107 satisfies: 1.44 1.52, Abbe number of the seventh lens 107 satisfies: 80 92, focal length of the seventh lens 107 focal length of the optical assembly satisfies: 0.9f 1.13f, radius of curvature of the entrance surface of the seventh lens 107 and radius of curvature of the exit surface satisfies: 0.42f 0.62f, -6.9f -3.9f;

[0044] refractive index of the eighth lens 108 satisfies: 1.41 1.51, Abbe number of the eighth lens 108 satisfies: 55 85, focal length of the eighth lens 108 focal length of the optical assembly satisfies: -0.9f -0.63f, radius of curvature of the entrance surface of the eighth lens 108 satisfies: -0.52f -0.15f;

[0045] The components with optical power in the optical assembly are only the above eight lenses.

[0046] Wherein, the refractive index reflects the deflection ability of the lens to light, and the Abbe number is a parameter for measuring the dispersion degree of the lens. The lens usually has an exit surface and an entrance surface, the entrance surface refers to the surface before the light enters the lens, and the exit surface refers to the surface that the light finally leaves after being refracted in the lens. The sign of the radius of curvature of the spherical lens is used to reflect the bending direction and shape characteristics of the lens surface, and the positive value of the radius of curvature of the lens surface indicates that the surface is convex, that is, the spherical center is located on the right side of the spherical vertex, and the negative value of the radius of curvature of the lens surface indicates that the surface is concave, that is, the spherical center is located on the left side of the spherical vertex.

[0047] Using the above embodiments, the optical component is coaxially arranged with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in sequence along the incident direction of light. The light passes through each lens to reach the focal plane. The field of view of this optical component is greater than 28°, the entrance pupil diameter is greater than 180mm, and the spectral range is 500nm-900nm, so that the maximum distortion does not exceed 0.02%. Precise distortion calibration is not required on the ground or in orbit, which reduces the computational load and time of the data processing system. When multiple devices observe, it will not cause data correlation errors, thereby improving the detection efficiency and accuracy of wide-area space debris detection.

[0048] To reduce the overall weight and volume of the optical components and minimize the impact of object distance variations on image quality, in one possible implementation, the center thickness of each lens and the spacing between lenses need to meet the following requirements:

[0049] The center thickness of the first lens 101 Meets the requirement of 25mm 37mm, center thickness of the second lens 102 Meets the requirement of 20mm 45mm, center thickness of the third lens 103 Meets the requirement of 45mm 65mm, center thickness of the fourth lens 104 Meets the requirement of 35mm 55mm, center thickness of the fifth lens 105 Meets the requirement of 40mm 70mm, center thickness of the sixth lens 106 Meets the requirement of 11mm 30mm, center thickness of the seventh lens 107 Meets the requirement of 45mm 60mm, center thickness of the eighth lens 108 Meets the requirement of 10mm 25mm.

[0050] The spacing between the first lens 101 and the second lens 102 Meets the requirement of 7mm 16mm, the spacing between the second lens 102 and the third lens 103 Satisfying: 0.1mm 3mm, the spacing between the third lens 103 and the fourth lens 104 Meets the requirement of 15mm 30mm, the spacing between the fourth lens 104 and the fifth lens 105 Meets the requirement of 35mm 45mm, the interval distance between the fifth lens 105 and the sixth lens 106 satisfies: 3mm 12mm, the interval distance between the sixth lens 106 and the seventh lens 107 satisfies: 40mm 73mm, the interval distance between the seventh lens 107 and the eighth lens 108 satisfies: 150mm 270mm.

[0051] In order to further reduce the volume of the optical assembly as a whole and balance the imaging quality, the interval distance between the eighth lens 108 and the image surface satisfies: 2mm≤ ≤20mm.

[0052] In order to further improve the radiation resistance of the optical assembly, the aforementioned lens materials are all radiation-resistant optical glass.

[0053] In order to correct the aberration of the optical assembly, so that the optical assembly can maintain consistent imaging quality in the entire field of view range (from the central field of view to the edge field of view), in one possible embodiment, the exit surface of the first lens 101, the entrance surface of the fourth lens 104, the entrance surface of the sixth lens 106, and the exit surface of the eighth lens 108 are all high-order aspheric surfaces, and the second lens 102, the third lens 103, the fifth lens 105, and the seventh lens 107 are all double spherical lenses.

[0054] By applying the above embodiment, the aspheric surface is used to correct the aberration of the optical assembly, so that the 80% diffused circle diameter of the optical assembly in the 28° field of view range is controlled within the range of 14μm-18μm, so that the optical assembly can maintain consistent imaging quality in the entire field of view range.

[0055] The exit surface of the first lens 101, the entrance surface of the fourth lens 104, the entrance surface of the sixth lens 106, and the exit surface of the eighth lens 108 are all high-order aspheric surfaces, which balance the primary and secondary aberrations of the optical assembly, and the sag z satisfies the following formula (1):

[0056] Formula (1)

[0057] Wherein, z is the sag of the high-order aspheric surface, c is the curvature of the aspheric surface, r is the aperture of the aspheric surface, K is the quadratic surface coefficient of the aspheric surface, A, B, C, D, E, and F are the coefficients of each order of the aspheric surface.

[0058] The formula (1) is a standard expression of an aspherical surface in the optical field, and the sag formula of the high-order aspherical surface in the embodiment is obtained by designing each coefficient (i.e., the coefficients K, A, B, C, D, E, and F) in the standard expression of the aspherical surface. In the formula (1), the left side of the equation is the sag of the high-order aspherical surface, and the unit of the sag is mm, so the unit of the sag on the left side of the equation is mm. The right side of the equation is the curvature, aperture, and each coefficient (i.e., the coefficients K, A, B, C, D, E, and F) of the high-order aspherical surface, the unit of the curvature and aperture is mm, K, A, B, C, D, E, and F are coefficients, and are dimensionless, so the unit of the sag on the right side of the equation is also mm.

[0059] For the exit surface of the first lens 101, K=0, A=8.0355e-009, B=3.8286e-014, C=3.6753e-019, and D=2.0498e-023;

[0060] For the exit surface of the fourth lens 104, K=-0.0803, A=3.4633e-009, B=1.1175e-013, C=-5.6443e-019, and D=2.3434e-022;

[0061] For the exit surface of the sixth lens 106, K=0, A=-1.5623e-008, B=-2.9486e-013, C=3.69e-019, and D=-2.8707e-022;

[0062] For the exit surface of the eighth lens 108, K=0, A=2.77711e-008, B=-1.7e-012, and C=5.73e-017.

[0063] It can be understood that the aperture determines the physical range of the optical assembly that can receive light, and the entrance pupil diameter determines the angular range and light receiving capability of the optical assembly that can receive light. The aperture size of the optical assembly is different, and based on this, in order to improve the observation capability of the optical assembly, in a possible embodiment, the entrance pupil diameter D of the optical assembly is 200 mm.

[0064] In a specific embodiment, the parameters of each lens in the optical assembly provided by the embodiment of the application are shown in Table 1.

[0065]

[0066] Based on Table 1, it can be known that the materials of all the lenses are radiation-resistant optical glass.

[0067] The radius of curvature of the entrance surface of the first lens 101 is -647.35 mm, and the radius of curvature of the exit surface of the first lens is -14800 mm, i.e. -1.48E+04 mm in Table 1; the radius of curvature of the entrance surface of the second lens 102 is -2185.99 mm, and the radius of curvature of the exit surface of the second lens 102 is 905.87 mm; the radius of curvature of the entrance surface of the third lens 103 is 350.13 mm, and the radius of curvature of the exit surface of the third lens 103 is -871.39 mm; the radius of curvature of the entrance surface of the fourth lens 104 is 207.71 mm, and the radius of curvature of the exit surface of the fourth lens 104 is 201.60 mm; the radius of curvature of the entrance surface of the fifth lens 105 is 233.41 mm, and the radius of curvature of the exit surface of the fifth lens 105 is -648.83 mm; the radius of curvature of the entrance surface of the sixth lens 106 is infinity, i.e. the entrance surface of the sixth lens 106 is a plane, and the radius of curvature of the exit surface of the sixth lens 106 is 241.58 mm; the radius of curvature of the entrance surface of the seventh lens 107 is 219.43 mm, and the radius of curvature of the exit surface of the seventh lens 107 is -1910.62 mm; the radius of curvature of the entrance surface of the eighth lens 108 is -159.48 mm, and the radius of curvature of the exit surface of the eighth lens 108 is infinity, i.e. the exit surface of the eighth lens 108 is a plane.

[0068] In Table 1, the interval refers to the distance in the optical axis direction through which the light ray propagates from the current surface (e.g. the first surface) to the next surface (e.g. the second surface). For example, the interval between the entrance surface of the first lens 101 and the exit surface of the first lens 101 is 30 mm, which means that the light ray propagates 30 mm from the entrance surface of the first lens 101 to the exit surface of the first lens 101. The interval between the exit surface of the first lens 101 and the entrance surface of the second lens 102 is 11.35 mm, which means that the light ray propagates 11.35 mm from the exit surface of the first lens 101 to the entrance surface of the second lens 102, and so on. The interval between the exit surface of the eighth lens 108 and the focal plane is 10 mm, which means that the light ray propagates 10 mm from the exit surface of the eighth lens 108 to the focal plane.

[0069] In Table 1, the values under the item of the radiation-resistant optical glass of the first lens 101 are the refractive index and the Abbe number of the lens. The value "abc.ABC" means "the radiation-resistant optical glass with a refractive index of 1.abc and an Abbe number of AB.C". For example, the first lens 101 is a radiation-resistant optical glass with a refractive index of 1.458 and an Abbe number of 69.8, and the second lens 102 is a radiation-resistant optical glass with a refractive index of 1.533 and an Abbe number of 60.6. Here, the values are not listed exhaustively.

[0070] Referring to Figure 2a and Figure 2b , Figure 2aA first schematic diagram of an energy concentration curve of the optical assembly provided by the embodiment of the present application, Figure 2b A second schematic diagram of an energy concentration curve of the optical assembly provided by the embodiment of the present application. Figure 2a A simulation result display interface obtained by simulation software is shown, Figure 2b A simulation result display interface obtained by simulation software is shown, Figure 2a A simulation result in the interface is shown. Five curves in the figure correspond to different field angles, which are 0°, 5°, 10°, 12° and 14° respectively, the horizontal axis is the diameter of the circle enclosing the energy (unit: mm), and the vertical axis is the proportion of the energy enclosed in the circle to the total energy (between 0 and 1). It can be seen from the figure that the diameter of the circle enclosing 80% of the energy of the optical assembly provided by the embodiment of the present application is between 14 μm and 18 μm within the field of view of ± 14°. Figure 2a In addition, Figure 2b It can be seen that the diameter of the circle enclosing 80% of the energy of the optical assembly provided by the embodiment of the present application is between 14 μm and 18 μm within the field of view of ± 14°.

[0071] Referring to Figure 3a In addition, Figure 3b , Figure 3a A first schematic diagram of an aberration curve of the optical assembly provided by the embodiment of the present application, Figure 3b A second schematic diagram of an aberration curve of the optical assembly provided by the embodiment of the present application, Figure 3a A simulation result display interface obtained by simulation software is shown, Figure 3b A simulation result display interface obtained by simulation software is shown, Figure 3a A simulation result in the interface is shown. Figure 3a In addition, Figure 3b A schematic diagram of a longitudinal spherical aberration curve of the optical assembly provided by the embodiment of the present application is shown on the left, Figure 3a In addition, Figure 3b A schematic diagram of a field curvature curve of the optical assembly provided by the embodiment of the present application is shown in the middle, Figure 3a In addition, Figure 3b A schematic diagram of a distortion curve of the optical assembly provided by the embodiment of the present application is shown on the right, Figure 3a In addition, Figure 3b It can be seen that the maximum distortion of the optical assembly provided by the embodiment of the present application is not more than 0.02% in the spectral range of 500 nm-900 nm.

[0072] The embodiment of the present application also provides a space debris wide-area detection optical system, and the space debris wide-area detection optical system comprises the optical assembly described above.

[0073] Applying the above embodiment, the space debris wide-area detection optical system coaxially has the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens in sequence along the light incidence direction, the light reaches the focal plane after passing through each lens, the field of view angle of the optical system is greater than 28 degrees, the spectral range is 500nm-900nm, so that the maximum distortion is not more than 0.02%, without the need for precise distortion calibration on the ground or in orbit, reducing the data processing system calculation amount and time, and multiple equipment observation will not cause data association error, thereby improving the detection efficiency and accuracy of the space debris wide-area detection. The optical system entrance pupil diameter is greater than 180mm, improving the observation ability of the optical system, using aspheric surface to correct the optical assembly aberration, so that the 28 degree field of view range 80% of the optical assembly is controlled in the range of 14-18um, so that the optical assembly can maintain consistent imaging quality in the entire field of view range.

[0074] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0075] Each of the embodiments in the specification is described in a relevant manner, and the same and similar parts between each of the embodiments can be referred to each other, and each of the embodiments focuses on the difference from other embodiments. Especially, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant part can be referred to the part of the method embodiment.

[0076] The above only describes the preferred embodiments of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical component, characterized in that the optical component is coaxially arranged with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in sequence along the incident direction of light, wherein light passes through each lens to reach the focal plane; the entrance pupil diameter D of the optical component satisfies: 180mm; The refractive index of the first lens The refractive index of the second lens The refractive index of the third lens The refractive index of the fourth lens The refractive index of the fifth lens The refractive index of the sixth lens The refractive index of the seventh lens The refractive index of the eighth lens Satisfies: 1.41 1.54, 1.45 1.57, 1.47 1.56, 1.41 1.53, 1.42 1.58, 1.55 1.75，1.44 1.52，1.41 1.51； Abbe number of the first lens The Abbe number of the second lens The Abbe number of the third lens The Abbe number of the fourth lens The Abbe number of the fifth lens The Abbe number of the sixth lens The Abbe number of the seventh lens The Abbe number of the eighth lens Satisfaction: 60 70, 55 68, 71 93, 80 95, 75 95, 31 56, 80 92, 55 85; The focal length of the first lens The focal length of the second lens The focal length of the third lens The focal length of the fourth lens The focal length of the fifth lens The focal length of the sixth lens The focal length of the seventh lens The focal length of the eighth lens With the focal length of the optical component Satisfy: -4.1f -2.79f, -3.51f -2.01f, 0.9f 1.52f, 22f 33f, 0.85f 1.43f, -1.18f -0.83f, 0.9f 1.13f, -0.9f -0.63f; Radius of curvature of the incident surface of the first lens and the radius of curvature of the exit surface The radius of curvature of the incident surface of the second lens and the radius of curvature of the exit surface The radius of curvature of the incident surface of the third lens and the radius of curvature of the exit surface The radius of curvature of the incident surface of the fourth lens and the radius of curvature of the exit surface The radius of curvature of the incident surface of the fifth lens and the radius of curvature of the exit surface The radius of curvature of the exit surface of the sixth lens The radius of curvature of the incident surface of the seventh lens and the radius of curvature of the exit surface The radius of curvature of the incident surface of the eighth lens Satisfy: -2.51f -1.12f, -42f -22f, -7.21f -4.1f, , -3.39f -1.78f, 0.37f 0.53f, 0.39f 0.54f, 0.48f 0.59f, -1.69f -1.46f, 0.49f 0.65f, 0.42f 0.62f, -6.9f -3.9f, -0.52f -0.15f; The optical components that have optical refractive power are only the eight lenses mentioned above.

2. The optical component according to claim 1, characterized in that, The center thickness of the first lens The center thickness of the second lens The center thickness of the third lens The center thickness of the fourth lens The center thickness of the fifth lens The center thickness of the sixth lens The center thickness of the seventh lens and the center thickness of the eighth lens Meets the requirement of 25mm 37mm, 20mm 45mm, 45mm 65mm, 35mm 55mm, 40mm 70mm, 11mm 30mm, 45mm 60mm, 10mm 25mm.

3. The optical component according to claim 1, characterized in that, The distance between the first lens and the second lens The distance between the second lens and the third lens The distance between the third lens and the fourth lens The distance between the fourth lens and the fifth lens The distance between the fifth lens and the sixth lens The distance between the sixth lens and the seventh lens The distance between the seventh lens and the eighth lens and the distance between the eighth lens and the image plane Meets the requirement of 7mm 16mm, 0.1mm 3mm, 15mm 30mm, 35mm 45mm, 3mm 12mm, 40mm 73mm, 150mm 270mm, 2mm 20mm.

4. The optical component according to claim 1, characterized in that, The lens is made of radiation-resistant optical glass.

5. The optical component according to claim 1, characterized in that, The exit surface of the first lens, the incident surface of the fourth lens, the incident surface of the sixth lens, and the exit surface of the eighth lens are all high-order aspherical surfaces, and the second lens, the third lens, the fifth lens, and the seventh lens are all bispherical lenses.

6. The optical component according to claim 5, characterized in that, The first lens has an incident surface radius of curvature of -647.35 mm and an exit surface radius of curvature of -14800 mm; the second lens has an incident surface radius of curvature of -2185.99 mm; the third lens has an exit surface radius of curvature of -871.39 mm; the fourth lens has an incident surface radius of curvature of 207.71 mm and an exit surface radius of curvature of 201.60 mm; the fifth lens has an incident surface radius of curvature of 233.41 mm and an exit surface radius of curvature of -648.83 mm; the sixth lens has an exit surface radius of curvature of 241.58 mm; the seventh lens has an incident surface radius of curvature of 219.43 mm and an exit surface radius of curvature of -1910.62 mm; and the eighth lens has an incident surface radius of curvature of -159.48 mm.

7. The optical component according to claim 5, characterized in that, The exit surface of the first lens, the incident surface of the fourth lens, the incident surface of the sixth lens, and the exit surface of the eighth lens satisfy the following: ； Where z is the sag of the higher-order aspherical surface, c is the curvature of the aspherical surface, r is the diameter of the aspherical surface, K is the coefficient of the aspherical quadratic surface, and A, B, C, D, E, and F are the coefficients of each order of the aspherical surface. For the exit surface of the first lens, K=0, A=8.0355e-009, B=3.8286e-014, C=3.6753e-019, D=2.0498e-023; For the incident surface of the fourth lens, K=-0.0803, A=3.4633e-009, B=1.1175e-013, C=-5.6443e-019, D=2.3434e-022; For the incident surface of the sixth lens, K=0, A=-1.5623e-008, B=-2.9486e-013, C=3.69e-019, D=-2.8707e-022; For the exit surface of the eighth lens, K=0, A=2.77711e-008, B=-1.7e-012, C=5.73e-017.

8. The optical component according to claim 5, characterized in that, The incident surface of the sixth lens and the exit surface of the eighth lens are both planes.

9. The optical component according to claim 1, characterized in that, The entrance pupil diameter D of the optical component is 200 mm.

10. A wide-area optical system for detecting space debris, characterized in that, The space debris wide-area detection optical system includes the optical components described in any one of claims 1-9.

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