Wide-spectrum athermalized optical system based on a global lens

Abstract

A broadband athermal optical system based on a global surface lens is characterized by the following components arranged sequentially from the outside to the inside along the light propagation direction: a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane). The protective window, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible light reflections and short-wave infrared radiation information inherent to the target and background, and converges them onto the detector photosensitive surface for photoelectric conversion. It exhibits high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. This invention belongs to the field of optical imaging technology. The optical system exhibits excellent imaging quality, strong light-gathering ability, and good environmental adaptability within a wide spectral and temperature range of 0.4μm to 2.3μm and -50℃ to +70℃. It features simple structure, easy assembly and adjustment, high reliability, low cost, good manufacturability, and high yield. It can be widely used in aerospace optical remote sensing, ground-based target tracking and detection, optical imaging guidance, astronomical observation, industrial multispectral imaging analysis and non-destructive testing, and civil security surveillance, with broad application prospects and significant economic benefits.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging technology, and more specifically, relates to a broadband athermal optical system based on a global surface lens. Background Technology

[0002] With the rapid development of detector technology, broadband imaging detection systems are playing an increasingly important role in science and technology, national economy, and national defense. This invention, based on an InGaAs (Vis-SWIR) detector with a broadband imaging detection capability of 0.4μm to 2.3μm, designs a broadband, thermal, high-resolution optical system operating in the 0.4μm to 2.3μm band. This system exhibits excellent imaging quality, strong light-gathering ability, and good environmental adaptability within an operating temperature range of -50℃ to +70℃. It features simple structure, easy assembly and adjustment, high reliability, low cost, good manufacturability, and high yield. It can be widely applied in aerospace optical remote sensing, ground-based target tracking and detection, optical imaging guidance, astronomical observation, industrial multispectral imaging analysis and non-destructive testing, and civilian security surveillance, demonstrating broad application prospects and significant economic benefits. Summary of the Invention

[0003] The purpose of this invention is to achieve a wide-band, high-resolution, low-cost, and calorimetric design for a broadband imaging detection system. This invention provides a broadband calorimetric optical system based on a global surface lens.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A broadband athermal optical system based on a global surface lens is characterized by the following components arranged sequentially from the outside to the inside along the light propagation direction: a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane). The protective window, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible light reflection and short-wave infrared radiation information inherent to the target and background, and converges it onto the detector photosensitive surface for photoelectric conversion. It exhibits high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. It can be applied in the field of optical imaging detection, as well as in civilian fields such as astronomical observation, industrial multispectral imaging analysis, and non-destructive testing.

[0006] Furthermore, the protective window of the optical system is a plane lens, and the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are all spherical lenses.

[0007] Furthermore, the inner and outer surfaces of the optical system's protective window are both planar, with a thickness of 5mm; the first lens has an outer surface radius of curvature of 61.28mm, an inner surface radius of curvature of 245.05mm, and a thickness of 7.9mm; the second lens has an outer surface radius of curvature of 175.41mm, an inner surface radius of curvature of 56.69mm, and a thickness of 4.95mm; the third lens has an outer surface radius of curvature of 826.04mm, an inner surface radius of curvature of 21.88mm, and a thickness of 3.5mm; the fourth lens has an outer surface radius of curvature of 21.88mm, an inner surface radius of curvature of -201.27mm, and a thickness of 4.2mm; the fifth lens has an outer surface... The radius of curvature of the outer surface of the sixth lens is 26.87 mm, the radius of curvature of the inner surface is 157.92 mm, and the thickness is 8 mm; the radius of curvature of the outer surface of the seventh lens is -1755.55 mm, the radius of curvature of the inner surface is -128.48 mm, and the thickness is 6 mm; the radius of curvature of the outer surface of the seventh lens is -128.48 mm, the radius of curvature of the inner surface is 44.64 mm, and the thickness is 5 mm; the radius of curvature of the outer surface of the eighth lens is 36.48 mm, the radius of curvature of the inner surface is -68.24 mm, and the thickness is 6 mm; the radius of curvature of the outer surface of the ninth lens is -27.19 mm, the radius of curvature of the inner surface is 42.91 mm, and the thickness is 3.9 mm.

[0008] Furthermore, the air gap between the optical system protective window and the first lens is 5 mm; the air gap between the first lens and the second lens is 2.75 mm; the air gap between the second lens and the third lens is 30 mm; the third lens and the fourth lens are bonded together using optical adhesive; the air gap between the fourth lens and the fifth lens is 0.2 mm; the air gap between the fifth lens and the sixth lens is 1.25 mm; the sixth lens and the seventh lens are bonded together using optical adhesive; the air gap between the seventh lens and the eighth lens is 26.5 mm; the air gap between the eighth lens and the ninth lens is 5.3 mm; and the distance between the ninth lens and the photosensitive surface (image plane) of the detector is 7.1 mm.

[0009] Furthermore, the protective window of the optical system is made of H-K9L material; the first lens is made of H-ZF73 material; the second lens is made of H-ZBAF52 material; the third lens is made of H-ZF73 material; the fourth lens is made of H-LAF3B material; the fifth lens is made of H-FK61 material; the sixth lens is made of H-LAF52 material; the seventh lens is made of H-QK3L material; the eighth lens is made of H-ZF73 material; and the ninth lens is made of H-ZBAF50 material.

[0010] Furthermore, the aperture of the protective window of the optical system is... The mass is 25g, and the aperture of the first lens is... The mass is 31.5g, and the aperture of the second lens is... The mass is 23.2g, and the aperture of the third lens is... The mass is 5.3g, and the aperture of the fourth lens is... The mass is 3.7g, and the aperture of the fifth lens is... The mass is 7g, and the aperture of the sixth lens is... The mass is 4.7g, and the aperture of the seventh lens is... The mass is 2.4g, and the aperture of the eighth lens is... The mass is 4.9g, and the aperture of the ninth lens is... The weight is 2.7g. Total optical weight (excluding protective window) < 86g.

[0011] Furthermore, the optical system operates in the wavelength range of 0.4μm to 2.3μm, has a focal length of 70mm, an F-number of 2.8, and a field of view of 7.8° × 6.2°. The detector is an InGaAs (Vis-SWIR) extended detector with a resolution of 640 × 512 and a pixel size of 15μm. At 100 lp / mm, the modulation transfer function value at 0 field of view is ≥0.52, the transfer function values ​​at other fields of view are ≥0.47, and the system distortion is ≤0.5%.

[0012] Furthermore, the optical system is designed with a single-image structure, using domestically produced Chengdu Guangming visible light glass as the lens material and all-aluminum alloy for the mechanical components. By rationally matching the lens power and fully considering material properties, advanced aberration theory is applied to effectively balance the contradiction between optical aberration and thermal difference. A global surface lens is used to achieve a wide-temperature, calorimetric design for the optical system. Within the operating temperature range of -50℃ to +70℃, the maximum distortion design value of the optical system is -0.49%. At -50℃, at 100 lp / mm, the transfer function value for the 0 field of view is ≥0.51, and the transfer function value for the other fields of view is ≥0.45. At 20℃, at 100 lp / mm, the transfer function value for the 0 field of view is ≥0.52, and the transfer function value for the other fields of view is ≥0.47. At +70℃, at 100 lp / mm, the transfer function value for the 0 field of view is ≥0.52, and the transfer function value for the other fields of view is ≥0.46.

[0013] Furthermore, the image plane relative illumination uniformity of the optical system is >96.8%, and the diffraction ingress energy is >85% in the radius of 5 μm, >92% in the radius of 7.5 μm, and >94% in the radius of 10 μm.

[0014] The advantages of this invention over the prior art are:

[0015] 1. The optical system described in this invention operates in the wavelength range of 0.4μm to 2.3μm, has a focal length of 70mm, an F-number of 2.8, a full field-of-view distortion of ≤0.5%, a field of view of 7.8°×6.2°, and uses an InGaAs (Vis-SWIR) extended detector with a resolution of 640×512 and a pixel size of 15μm. It is a low F-number broadband imaging optical system with the characteristics of wide operating wavelength, high resolution, large relative aperture, and strong light-gathering ability.

[0016] 2. The optical system described in this invention employs a single-image optical structure. The total weight (excluding the protective window) is less than 86g, featuring a compact structure, small size, and light weight.

[0017] 3. The optical system described in this invention has a transfer function of ≥0.52 (100 lp / mm) for the 0 field of view and ≥0.47 (100 lp / mm) for the other fields of view. It has excellent imaging quality, a single pixel angle of <0.215 mrad, high resolution, long detection distance, and outstanding performance characteristics.

[0018] 4. The optical system uses domestically produced Chengdu Guangming visible light glass as the lens material, and the mechanical parts are made of all-aluminum alloy. By reasonably matching the lens power and fully considering the material characteristics, the contradiction between optical aberration and thermal difference is effectively balanced by using advanced aberration theory. The use of global surface lenses realizes the wide-temperature calorimetric design of the optical system. It has excellent imaging quality in the operating temperature range of -50℃ to +70℃, strong environmental adaptability, good processability, easy assembly and adjustment, high yield, low cost, and is suitable for mass production. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a broadband athermalized optical system based on a global surface lens;

[0020] Figure 2 The modulation transfer function curve of the optical system at an operating temperature of +70℃;

[0021] Figure 3 The modulation transfer function curve of the optical system at an operating temperature of +20℃;

[0022] Figure 4 The modulation transfer function curve of the optical system at an operating temperature of -50℃;

[0023] Figure 5 For optical system distortion and field curvature curves;

[0024] Figure 6This is a point plot curve for the optical system;

[0025] Figure 7 The curve represents the relative illumination uniformity of the image plane in the optical system.

[0026] Figure 8 The diffraction circle energy curve of the optical system;

[0027] In the diagram: 1. Protective window, 2. First lens, 3. Second lens, 4. Third lens, 5. Fourth lens, 6. Fifth lens, 7. Sixth lens, 8. Seventh lens, 9. Eighth lens, 10. Ninth lens, 11. Detector photosensitive surface (image plane). Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings.

[0029] Example 1

[0030] This embodiment describes a broadband athermal optical system based on a global surface lens. Its key feature is that, from the outside in the direction of light propagation, a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane) are arranged sequentially. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible reflections and short-wave infrared radiation information inherent to the target and background, and converges them onto the detector photosensitive surface to achieve photoelectric conversion. It has high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. It can be applied to the field of optical imaging detection, and also to civilian applications such as astronomical observation, industrial multispectral imaging analysis, and non-destructive testing.

[0031] The specific purpose of this technical solution is to achieve a wide-spectrum, high-resolution, low-cost, and thermal design for a wide-spectrum imaging detection system. Based on domestically produced Chengdu Guangming visible light optical materials, and utilizing a single-image optical structure, an InGaAs (Vis-SWIR) extended detector with an array size of 640×512 pixels and a size of 15μm is selected as the receiver. This design enables the detection, identification, and precise positioning of targets under all-weather and complex meteorological conditions. It can be applied to the field of optical imaging detection, as well as to civilian applications such as astronomical observation, industrial multispectral imaging analysis, and non-destructive testing.

[0032] Example 2

[0033] This embodiment describes a broadband athermal optical system based on a global surface lens. Its key feature is that, from the outside in the direction of light propagation, a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane) are arranged sequentially. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible reflections and short-wave infrared radiation information inherent to the target and background, and converges them onto the detector photosensitive surface to achieve photoelectric conversion. It has high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. It can be applied to the field of optical imaging detection, and also to civilian applications such as astronomical observation, industrial multispectral imaging analysis, and non-destructive testing.

[0034] The protective window of the optical system is made of H-K9L material; the first lens 1 is made of H-ZF73 material; the second lens 2 is made of H-ZBAF52 material; the third lens 3 is made of H-ZF73 material; the fourth lens 4 is made of H-LAF3B material; the fifth lens 5 is made of H-FK61 material; the sixth lens 6 is made of H-LAF52 material; the seventh lens 7 is made of H-QK3L material; the eighth lens 8 is made of H-ZF73 material; and the ninth lens 9 is made of H-ZBAF50 material. The protective window is a planar window, and all other lenses are spherical lenses.

[0035] This technical solution defines the materials, quantity, and surface shape of each lens. The design employs a single-image structure, using domestically produced Chengdu Guangming visible light optical materials as the lens material. Mechanical components are made entirely of aluminum alloy. By rationally matching the lens power and fully considering material properties, advanced aberration theory is applied to effectively balance the contradiction between optical aberrations and thermal differences. The use of global surface lenses achieves a wide-temperature, athermal design for the optical system, resulting in excellent image quality within an operating temperature range of -50℃ to +70℃. The system also features good manufacturability, easy assembly and calibration, high yield, low cost, strong environmental adaptability, and suitability for mass production.

[0036] Example 3

[0037] This embodiment describes a broadband athermal optical system based on a global surface lens. Its key feature is that, from the outside in the direction of light propagation, a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane) are arranged sequentially. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible reflections and short-wave infrared radiation information inherent to the target and background, and converges them onto the detector photosensitive surface to achieve photoelectric conversion. It has high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. It can be applied to the field of optical imaging detection, and also to civilian applications such as astronomical observation, industrial multispectral imaging analysis, and non-destructive testing.

[0038] The optical system operates in the wavelength range of 0.4μm to 2.3μm, has a focal length of 70mm, an F-number of 2.8, a full field-of-view distortion of ≤0.5%, a field of view of 7.8°×6.2°, and uses an InGaAs (Vis-SWIR) extended detector with a resolution of 640×512 and a pixel size of 15μm. At 100lp / mm, the modulation transfer function value at 0 field of view is ≥0.52, the transfer function values ​​at other fields of view are ≥0.47, and the system distortion is ≤0.5%.

[0039] This technical solution defines the technical parameters of the optical system, such as the working band, focal length, F number, field of view, detector resolution and pixel size, and transfer function. The system is a small F number broadband imaging optical system with the characteristics of wide working band, large relative aperture, and high resolution.

[0040] Example 4

[0041] This embodiment describes a broadband athermal optical system based on a global surface lens. Its key feature is that, from the outside in the direction of light propagation, a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane) are arranged sequentially. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible reflections and short-wave infrared radiation information inherent to the target and background, and converges them onto the detector photosensitive surface to achieve photoelectric conversion. It has high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. It can be applied to the field of optical imaging detection, and also to civilian applications such as astronomical observation, industrial multispectral imaging analysis, and non-destructive testing.

[0042] The optical system operates within a temperature range of -50℃ to +70℃, with a maximum designed distortion of -0.49%. At -50℃, the transfer function value at 100 lp / mm is ≥0.51 for the 0 field of view and ≥0.45 for the other fields of view. At 20℃, the transfer function value at 100 lp / mm is ≥0.52 for the 0 field of view and ≥0.47 for the other fields of view. At +70℃, the transfer function at 100 lp / mm is ≥0.52 for the 0 field of view and ≥0.46 for the other fields of view.

[0043] The optical system described in this technical solution has a modulation transfer function curve design value close to the diffraction limit within the operating temperature range of -50℃ to +70℃, resulting in excellent imaging quality, low distortion, good environmental adaptability, and outstanding performance characteristics.

[0044] Example 5

[0045] This embodiment describes a broadband athermal optical system based on a global surface lens. Its key feature is that, from the outside in the direction of light propagation, a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane) are arranged sequentially. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible reflections and short-wave infrared radiation information inherent to the target and background, and converges them onto the detector photosensitive surface to achieve photoelectric conversion. It has high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. It can be applied to the field of optical imaging detection, and also to civilian applications such as astronomical observation, industrial multispectral imaging analysis, and non-destructive testing.

[0046] The external dimensions of the optical system (excluding the protective window) Total optical weight (excluding protective window) < 86g.

[0047] This technical solution limits the external dimensions and total weight of the optical system, and features a compact structure, small size, and light weight.

[0048] Example 6

[0049] This embodiment describes a broadband athermal optical system based on a global surface lens. Its key feature is that, from the outside in the direction of light propagation, a protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface (image plane) are arranged sequentially. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are coaxially arranged with the detector photosensitive surface (image plane). The optical system receives visible reflections and short-wave infrared radiation information inherent to the target and background, and converges them onto the detector photosensitive surface to achieve photoelectric conversion. It has high sensitivity and relatively low spatial resolution, enabling target detection, identification, and precise positioning under all-weather and complex meteorological conditions. It can be applied to the field of optical imaging detection, and also to civilian applications such as astronomical observation, industrial multispectral imaging analysis, and non-destructive testing.

[0050] The image plane relative illumination uniformity of the optical system is >96.8%. The diffraction ingress energy is >85% in the radius of 5 μm; >92% in the radius of 7.5 μm; and >94% in the radius of 10 μm. The single-pixel angle is <0.215 mrad.

[0051] This technical solution defines the image plane relative illumination uniformity, system diffraction ingress energy value, and single-pixel subtendancy of the optical system. The optical system exhibits good image plane uniformity, high energy concentration, strong light-gathering ability, high angular resolution, and long detection distance. The optical system can be extended to high-resolution small-pixel detectors with pixel sizes less than 5μm.

[0052] Working principle of optical imaging detection system

[0053] The optical imaging detection system (hereinafter referred to as the system) consists of six parts: a protective window, an outer shell, an optical system, an imaging detector, an image processing and signal transmission system, and a terminal control system. The protective window and the outer shell form a sealed space to protect the internal components of the system. It features high strength, high hardness, radiation resistance, and high transmittance, ensuring normal operation of the system under complex working conditions. The optical system receives the inherent reflection and radiation information from the target and background, and converges it onto the photosensitive surface of the imaging detector. The imaging detector converts the light signal into an electrical signal, achieving photoelectric conversion, and has high sensitivity and relatively low spatial resolution. The image processing and signal transmission system processes the received data and transmits it to the terminal control system. The terminal control system analyzes and judges the received data and sends control commands to achieve target detection, identification, and precise positioning. This invention only describes the optical system in detail; other subsystems are not specifically described.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A global lens based athermalized optical system for a wide spectral range from 0.4 μm to 2.3 μm, characterized in that: A protective window, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a detector photosensitive surface are arranged sequentially from the outside to the inside along the direction of light propagation. The protective window, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are coaxially arranged with the detector photosensitive surface. The optical system is used to receive visible light reflection and short-wave infrared radiation information inherent to the target and background, and converge them onto the detector photosensitive surface to achieve photoelectric conversion. Under all-weather and complex meteorological conditions, it can realize the detection, identification, and precise positioning of targets. It can be applied to the field of optical imaging detection, and can also be used in astronomical observation, industrial multispectral imaging analysis, and non-destructive testing of civilian products. The protective window (1) of the optical system has a planar inner and outer surface with a thickness of 5 mm; the first lens (2) has a radius of curvature of 61.28 mm on the outer surface, a radius of curvature of 245.05 mm on the inner surface, and a thickness of 7.9 mm; the second lens (3) has a radius of curvature of 175.41 mm on the outer surface, a radius of curvature of 56.69 mm on the inner surface, and a thickness of 4.95 mm; the third lens (4) has a radius of curvature of 826.04 mm on the outer surface, a radius of curvature of 21.88 mm on the inner surface, and a thickness of 3.5 mm; the fourth lens (5) has a radius of curvature of 21.88 mm on the outer surface, a radius of curvature of -201.27 mm on the inner surface, and a thickness of 4.2 mm; the fifth lens (6) has a planar outer surface... The radius of curvature of the outer surface of the sixth lens (7) is 26.87 mm, the radius of curvature of the inner surface is 157.92 mm, and the thickness is 8 mm; the radius of curvature of the outer surface of the sixth lens (7) is -1755.55 mm, the radius of curvature of the inner surface is -128.48 mm, and the thickness is 6 mm; the radius of curvature of the outer surface of the seventh lens (8) is -128.48 mm, the radius of curvature of the inner surface is 44.64 mm, and the thickness is 5 mm; the radius of curvature of the outer surface of the eighth lens (9) is 36.48 mm, the radius of curvature of the inner surface is -68.24 mm, and the thickness is 6 mm; the radius of curvature of the outer surface of the ninth lens (10) is -27.19 mm, the radius of curvature of the inner surface is 42.91 mm, and the thickness is 3.9 mm. The air gap between the optical system protective window (1) and the first lens (2) is 5 mm; the air gap between the first lens (2) and the second lens (3) is 2.75 mm; the air gap between the second lens (3) and the third lens (4) is 30 mm; the third lens (4) and the fourth lens (5) are bonded together with optical adhesive; the air gap between the fourth lens (5) and the fifth lens (6) is 0.2 mm; the air gap between the fifth lens (6) and the sixth lens (7) is 1.25 mm; the sixth lens (7) and the seventh lens (8) are bonded together with optical adhesive; the air gap between the seventh lens (8) and the eighth lens (9) is 26.5 mm; the air gap between the eighth lens (9) and the ninth lens (10) is 5.3 mm; the distance between the ninth lens (10) and the photosensitive surface (11) of the detector is 7.1 mm.

2. The global lens based 0.4-2.3 pm wide spectrum athermalized optical system according to claim 1, characterized in that: The optical system protection window (1) is a plane lens, and the first lens (2), the second lens (3), the third lens (4), the fourth lens (5), the fifth lens (6), the sixth lens (7), the seventh lens (8), the eighth lens (9), and the ninth lens (10) are all spherical lenses.

3. The global lens based 0.4-2.3 pm wide spectrum athermalized optical system according to claim 1, wherein: The optical system protective window (1) is made of H-K9L material; the first lens (2) is made of H-ZF73 material; the second lens (3) is made of H-ZBAF52 material; the third lens (4) is made of H-ZF73 material; the fourth lens (5) is made of H-LAF3B material; the fifth lens (6) is made of H-FK61 material; the sixth lens (7) is made of H-LAF52 material; the seventh lens (8) is made of H-QK3L material; the eighth lens (9) is made of H-ZF73 material; and the ninth lens (10) is made of H-ZBAF50 material.

4. The global lens based 0.4-2.3 pm wide spectrum athermalized optical system according to claim 1, wherein: The optical system has a protective window (1) with a diameter of φ50mm and a mass of 25g, a first lens (2) with a diameter of φ44mm and a mass of 31.5g, a second lens (3) with a diameter of φ40mm and a mass of 23.2g, a third lens (4) with a diameter of φ22mm and a mass of 5.3g, a fourth lens (5) with a diameter of φ21mm and a mass of 3.7g, a fifth lens (6) with a diameter of φ20mm and a mass of 7g, a sixth lens (7) with a diameter of φ18mm and a mass of 4.7g, a seventh lens (8) with a diameter of φ18mm and a mass of 2.4g, an eighth lens (9) with a diameter of φ21mm and a mass of 4.9g, and a ninth lens (10) with a diameter of φ16mm and a mass of 2.7g. The external dimensions of the optical system without the protective window are <φ44mm×123mm, and the total weight of the optical system without the protective window is <86g.

5. The global lens based 0.4-2.3 pm wide spectrum athermalized optical system according to claim 1, wherein: The optical system operates in the wavelength range of 0.4μm to 2.3μm, has a focal length of 70 mm, an F-number of 2.8, and a field of view of 7.8° × 6.2°. The detector is an InGaAs extended detector with a resolution of 640 × 512 and a pixel size of 15μm. At 100 lp / mm, the modulation transfer function value at 0 field of view is ≥0.52, the transfer function value at other fields of view is ≥0.47, and the system distortion is ≤0.5%.

6. The global lens based 0.4-2.3 pm wide spectrum athermalized optical system according to claim 1, wherein: The optical system is designed with a single-image structure. All mechanical components are made of aluminum alloy. By rationally matching the lens power and fully considering material properties, advanced aberration theory is applied to effectively balance the contradiction between optical aberration and thermal difference. A global surface lens is used to achieve a wide-temperature, calorimetric design for the optical system. Within the operating temperature range of -50℃ to +70℃, the maximum distortion design value of the optical system is -0.49%. At -50℃, at 100 lp / mm, the transfer function value for the 0 field of view is ≥0.51, and the transfer function value for other fields of view is ≥0.

45. At 20℃, at 100 lp / mm, the transfer function value for the 0 field of view is ≥0.52, and the transfer function value for other fields of view is ≥0.

47. At +70℃, at 100 lp / mm, the transfer function value for the 0 field of view is ≥0.52, and the transfer function value for other fields of view is ≥0.

46.

7. A broadband athermal optical system with a 0.4μm~2.3μm field of view based on a global surface lens according to claim 1, characterized in that: The relative illumination uniformity of the detector photosensitive surface (11) of the optical system is >96.8%, and the diffraction ingress energy is >85% in the radius of 5μm, >92% in the radius of 7.5μm, and >94% in the radius of 10μm.

Images