A large-aperture and large-image-surface space debris monitoring optical system

Abstract

The present invention relates to a large-aperture and large-image-surface space debris monitoring optical system. The optical system is provided with a front fixed group A with negative optical power, an aperture, and a rear fixed group B with positive optical power in sequence along the incident light path. The front fixed group A is composed of a meniscus positive lens A1, a first cemented group formed by closely bonding a biconvex positive lens A2 and a biconcave negative lens A3, and a second cemented group formed by closely bonding a meniscus positive lens A4 and a meniscus negative lens A5. The rear fixed group B is composed of a biconvex positive lens B1, a biconcave negative lens B2 and a biconvex positive lens B1. The optical system consists of a third cemented group formed by closely bonding lenses B3, a biconvex positive lens B4, a fourth cemented group formed by closely bonding biconvex positive lens B5 and biconcave negative lens B6, a meniscus positive lens B7, a meniscus negative lens B8 and flat glass B9; the optical system has high resolution, low distortion, small chromatic aberration, strong monitoring capability, large aperture and large image surface, which are conducive to enhancing the energy entering the optical system, monitoring smaller space debris, and increasing the monitoring range of space debris; a weight-reduction design is adopted to effectively control the weight of the lenses, which is conducive to the carrying of aircraft.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic technology, in particular to a large-aperture and large-image-surface space debris monitoring optical system. Background Art

[0002] Space debris, also known as space junk, is waste left in space by humans during space activities. It primarily includes discarded spacecraft and launch vehicle bodies, solid rocket fuel, and fragments from in-orbit spacecraft operations and collisions.

[0003] With advances in space technology, human activities in space are becoming increasingly frequent, and at the same time, an increasing amount of space debris is being generated. Statistics show that there are dozens of dangerous encounters between spacecraft and space debris every week. Therefore, strengthening space debris monitoring and early warning capabilities to ensure the safety of our space assets is a top priority. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a large-aperture and large-image-surface space debris monitoring optical system with low distortion, small chromatic aberration, and strong monitoring capability.

[0005] The present invention is implemented by the following scheme: a large-aperture, large-image-surface space debris monitoring optical system, wherein the optical system is provided with a front fixed group A with negative optical focal length, an aperture, and a rear fixed group B with positive optical focal length in sequence along an incident light path; the front fixed group A is composed of a meniscus positive lens A1 arranged in sequence, a first cemented group formed by a biconvex positive lens A2 and a biconcave negative lens A3 being closely bonded, and a second cemented group formed by a meniscus positive lens A4 and a meniscus negative lens A5 being closely bonded; the rear fixed group B is composed of a biconvex positive lens B1 arranged in sequence, a third cemented group formed by a biconcave negative lens B2 and a biconvex positive lens B3 being closely bonded, a biconvex positive lens B4, a fourth cemented group formed by a biconvex positive lens B5 and a biconcave negative lens B6 being closely bonded, a meniscus positive lens B7, a meniscus negative lens B8, and a flat glass plate B9.

[0006] Furthermore, the focal length of the optical system is f, the focal length of the front fixed group A is fa, and the focal length of the rear fixed group B is fb, which satisfies the following relationship: <fa / f<-2 ,0<fb / f<1。

[0007] Furthermore, the air gap between the front fixed group A and the rear fixed group B is 15 mm to 20 mm; the air gap between the meniscus positive lens A1 and the biconvex positive lens A2 is 5 mm to 10 mm, and the air gap between the biconcave negative lens A3 and the meniscus positive lens A4 is 15 mm to 25 mm.

[0008] Furthermore, the air gap between the biconvex positive lens B1 and the biconcave negative lens B2 is 4 mm to 6 mm, the air gap between the biconvex positive lens B3 and the biconvex positive lens B4 is 0.1 mm to 0.5 mm, the air gap between the biconvex positive lens B4 and the biconvex positive lens B5 is 20 mm to 30 mm, the air gap between the biconcave negative lens B6 and the meniscus positive lens B7 is 1 mm to 3 mm, and the air gap between the meniscus positive lens B7 and the meniscus negative lens B8 is 15 mm to 25 mm.

[0009] Furthermore, at least one positive lens in the front fixed group A is made of extra-low dispersion glass, and at least two positive lenses in the rear fixed group B are made of extra-low dispersion glass.

[0010] Furthermore, the maximum lens aperture of the optical system is greater than 135 mm; the image plane of the optical system is greater than 86 mm; and the weight of the lens of the optical system is less than 5.5 kg.

[0011] Compared with the existing technology, the present invention has the following beneficial effects: the large-aperture and large-image-surface space debris monitoring optical system of the present invention has high resolution, low distortion, small chromatic aberration, and strong monitoring capability. At the same time, it has the advantages of large aperture and large image surface, which is conducive to enhancing the energy entering the optical system, monitoring smaller space debris, and increasing the monitoring range of space debris; it adopts a weight-reduction design to effectively control the weight of the lens, which is conducive to the installation of aircraft.

[0012] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the optical structure of an embodiment of the present invention;

[0014] Figure 2 Axial chromatic aberration diagram of the working band of an embodiment of the present invention;

[0015] Figure 3 This is a vertical axis chromatic aberration diagram of the working band of an embodiment of the present invention;

[0016] Figure 4 This is a field curvature distortion diagram of the working band of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0018] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0019] like Figures 1 to 4 As shown, a large-aperture, large-image-area space debris monitoring optical system is provided, in sequence along the incident light path, with a front fixed group A having negative optical power, an aperture, and a rear fixed group B having positive optical power. The front fixed group A comprises a meniscus positive lens A1, a first cemented group formed by closely bonding a biconvex positive lens A2 and a biconcave negative lens A3, and a second cemented group formed by closely bonding a meniscus positive lens A4 and a meniscus negative lens A5. The rear fixed group B comprises a biconvex positive lens B1, a third cemented group formed by closely bonding a biconcave negative lens B2 and a biconvex positive lens B3, a biconvex positive lens B4, a fourth cemented group formed by closely bonding a biconvex positive lens B5 and a biconcave negative lens B6, a meniscus positive lens B7, a meniscus negative lens B8, and flat glass B9. The optical system has the advantages of high resolution and low distortion. The cemented groups effectively reduce imaging chromatic aberration, resulting in low chromatic aberration and accurate lens color reproduction.

[0020] In this embodiment, the focal length of the optical system is f, the focal length of the front fixed group A is fa, and the focal length of the rear fixed group B is fb, which satisfies the following relationship: <fa / f<-2 ,0<fb / f<1。

[0021] In this embodiment, the air gap between the front fixing group A and the rear fixing group B is 15 mm to 20 mm, preferably 18.36 mm.

[0022] In this embodiment, the air gap between the meniscus positive lens A1 and the biconvex positive lens A2 is 5 mm to 10 mm, preferably 6.41 mm; the air gap between the biconcave negative lens A3 and the meniscus positive lens A4 is 15 mm to 25 mm, preferably 19.54 mm.

[0023] In this embodiment, the air gap between the biconvex positive lens B1 and the biconcave negative lens B2 is 4 mm to 6 mm, preferably 4.81 mm; the air gap between the biconvex positive lens B3 and the biconvex positive lens B4 is 0.1 mm to 0.5 mm, preferably 0.15 mm; the air gap between the biconvex positive lens B4 and the biconvex positive lens B5 is 20 mm to 30 mm, preferably 22.8 mm; the air gap between the biconcave negative lens B6 and the meniscus positive lens B7 is 1 mm to 3 mm, preferably 2.1 mm; the air gap between the meniscus positive lens B7 and the meniscus negative lens B8 is 15 mm to 25 mm, preferably 19.81 mm.

[0024] In this embodiment, at least one positive lens in the front fixed group A is made of extra-low dispersion glass, and at least two positive lenses in the rear fixed group B are made of extra-low dispersion glass.

[0025] In this embodiment, the maximum lens aperture of the optical system is greater than 135 mm, which is conducive to enhancing the energy entering the optical system and monitoring smaller space debris; the image surface of the optical system is greater than 86 mm, which is conducive to increasing the monitoring range of space debris; the weight of the optical system lens is less than 5.5 kg.

[0026] In this embodiment, the optical system achieves the following indicators:

[0027] (1) Maximum lens aperture = 140 mm; (2) Image plane = 87 mm; (3) Lens weight = 5.4 kg.

[0028] The specific parameters of each lens in the optical system of this embodiment are shown in the table below (S1 to S25 are mirror surface numbers, and the glued surface of the glued group is counted as one surface):

[0029]

[0030] Unless otherwise stated, for any of the technical solutions disclosed in the present invention, if a numerical range is disclosed, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely a numerical range that is representative or has a more obvious technical effect among many feasible numerical values. Due to the large number of numerical values, it is impossible to enumerate them exhaustively. Therefore, the present invention discloses some numerical values ​​to illustrate the technical solutions of the present invention. Moreover, the numerical values ​​listed above should not be construed as limiting the scope of protection of the present invention.

[0031] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integral molding using a casting process) (except where it is obviously not possible to use an integrated molding process).

[0032] In addition, unless otherwise stated, the terms used in any technical solution disclosed in the present invention to express positional relationships or shapes include states or shapes that are approximate, similar, or close thereto.

[0033] Any component provided by the present invention may be assembled from multiple separate components, or may be a separate component manufactured by an integral molding process.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A large-aperture, large-image-area space debris monitoring optical system, characterized by: The optical system is successively provided with a front fixed group A with a negative focal power, an aperture stop, and a rear fixed group B with a positive focal power along the incident optical path; the front fixed group A is composed of a meniscus positive lens A1, a first cemented group formed by closely joining a biconvex positive lens A2 and a biconcave negative lens A3, and a second cemented group formed by closely joining a meniscus positive lens A4 and a meniscus negative lens A5 arranged in sequence; the rear fixed group B is composed of a biconvex positive lens B1, a third cemented group formed by closely joining a biconcave negative lens B2 and a biconvex positive lens B3, a biconvex positive lens B4, a fourth cemented group formed by closely joining a biconvex positive lens B5 and a biconcave negative lens B6, a meniscus positive lens B7, a meniscus negative lens B8, and a flat glass B9 arranged in sequence; the focal length of the optical system is f, the focal length of the front fixed group A is fa, and the focal length of the rear fixed group B is fb, satisfying the following relationship: -3 < fa / f < -2, 0 < fb / f < 1; the maximum lens aperture of the optical system is greater than 135 mm; the image plane of the optical system is greater than 86 mm.

2. The large-aperture, large-image-area space debris monitoring optical system according to claim 1, characterized in that: The air gap between the front fixed group A and the rear fixed group B is 15 mm to 20 mm; the air gap between the meniscus positive lens A1 and the biconvex positive lens A2 is 5 mm to 10 mm, and the air gap between the biconcave negative lens A3 and the meniscus positive lens A4 is 15 mm to 25 mm.

3. The large-aperture, large-image-area space debris monitoring optical system according to claim 1 or 2, characterized in that: The air gap between the biconvex positive lens B1 and the biconcave negative lens B2 is 4 mm to 6 mm, the air gap between the biconvex positive lens B3 and the biconvex positive lens B4 is 0.1 mm to 0.5 mm, the air gap between the biconvex positive lens B4 and the biconvex positive lens B5 is 20 mm to 30 mm, the air gap between the biconcave negative lens B6 and the meniscus positive lens B7 is 1 mm to 3 mm, and the air gap between the meniscus positive lens B7 and the meniscus negative lens B8 is 15 mm to 25 mm.

4. The large-aperture, large-image-area space debris monitoring optical system according to claim 1, characterized in that: At least one positive lens in the front fixed group A is made of ultra-low dispersion glass, and at least two positive lenses in the rear fixed group B are made of ultra-low dispersion glass.

5. The large-aperture, large-image-area space debris monitoring optical system according to claim 1, characterized in that: The weight of the lenses of the optical system is less than 5.5 kg.

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