10-degree field-of-view medium-wave infrared lens for unmanned aerial vehicle

Abstract

The utility model relates to a 10-degree field-of-view medium-wave infrared lens for an unmanned aerial vehicle, and belongs to the technical field of optical lenses. The technical problem that the optical design of an optical lens in the prior art cannot meet the actual requirement is solved. The medium-wave infrared lens comprises a first positive meniscus lens, a negative meniscus lens, a second positive meniscus lens, a diaphragm, a first optical filter and a second optical filter which are sequentially and coaxially arranged along the propagation direction of light. The medium-wave infrared lens is simple in structure, high in imaging transfer function, low in distortion, good in imaging definition, good in uniformity and suitable for accurate observation and measurement in a small range, and the imaging quality of the optical lens cannot be greatly influenced by large environment temperature change, and the visual angle range is fixed to be 10 degrees.

Description

TECHNICAL FIELD

[0001] The utility model belongs to optical lens technical field, concretely relates to a 10 degree field of view mid wave infrared lens for unmanned plane, especially suitable for unmanned plane aviation remote sensing, environmental protection monitoring and reconnaissance field in foggy weather and night. BACKGROUND

[0002] The optical lens carried in the aviation field works in high altitude, and requires realizing clear imaging on the ground target under the condition that parameters such as environmental temperature and atmospheric pressure change constantly.Especially under complex climate conditions, consistent imaging with low distortion needs to be realized, and the influence of environmental temperature change on imaging can be resisted.But the optical design of the optical lens in the prior art cannot meet the actual demand. UTILITY MODEL CONTENT

[0003] Therefore, the utility model aims at providing a 10 degree field of view mid wave infrared lens for unmanned plane, which has high imaging transfer function, low distortion and good uniformity, and the imaging quality of the optical lens will not be greatly influenced by great environmental temperature change.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A 10 degree field of view mid wave infrared lens for unmanned plane, comprising a first positive meniscus lens, a negative meniscus lens, a second positive meniscus lens, a window sheet, a first filter and a second filter which are coaxially arranged in sequence along the propagation direction of light, and a diaphragm surface is arranged between the second filter and an image surface, and the first filter and the second filter are used for filtering non-mid wave infrared band light.

[0006] Further, the material of the first positive meniscus lens is SILICON, the curvature radii of front and back surfaces are 61.34mm and 121.63mm respectively, and the thickness is 6.00mm;

[0007] The material of the negative meniscus lens is GERMANIUM, the curvature radii of front and back surfaces are 292.06mm and 99.85488mm respectively, the thickness is 3.40mm, and the spacing between the negative meniscus lens and the first positive meniscus lens is 9.34mm;

[0008] The material of the second positive meniscus lens is SILICON, the curvature radii of front and back surfaces are 163.24mm and 1348.65mm respectively, the thickness is 4.00mm, and the spacing between the second positive meniscus lens and the negative meniscus lens is 22.65mm;

[0009] The material of the window sheet is SILICON, the thickness is 2.00mm, and the spacing between the window sheet and the second positive meniscus lens is 10.00mm;

[0010] The material of the first filter sheet is SILICON, the thickness is 1.00mm, and the distance between the first filter sheet and the window sheet is 3.00mm;

[0011] The material of the second filter sheet is SILICON, the thickness is 0.30mm, the distance between the second filter sheet and the first filter sheet is 2.20mm, the distance between the second filter sheet and the diaphragm surface is 0.66mm, and the distance between the diaphragm surface and the image surface is 20.47mm.

[0012] Compared with the prior art, the unmanned aerial vehicle 10° field of view mid-wave infrared lens has the beneficial effects that:

[0013] The unmanned aerial vehicle 10° field of view mid-wave infrared lens has the advantages of simple structure, high imaging transfer function, low distortion, little influence of large environmental temperature change on imaging quality of the optical lens, good imaging clarity, good uniformity, fixed visual angle range of 10°, and suitability for small-range precise observation and measurement, especially for unmanned aerial vehicle aerial remote sensing, environmental protection monitoring and reconnaissance in foggy weather and at night. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0015] Figure 1 It is a structural schematic view of the unmanned aerial vehicle 10° field of view mid-wave infrared lens of the present application.

[0016] In the figure, 1 is a first positive meniscus lens, 2 is a negative meniscus lens, 3 is a second positive meniscus lens, 4 is a window sheet, 5 is a first filter sheet, 6 is a second filter sheet, and 7 is a diaphragm surface.

[0017] Figure 2 It is a full field of view MTF diagram of the optical lens in the embodiment 1 of the present application.

[0018] Figure 3 It is a full field of view maximum distortion diagram of the optical lens in the embodiment 1 of the present application.

[0019] Figure 4 It is a full field of view illumination uniformity of the optical lens in the embodiment 1 of the present application.

[0020] Figure 5 It is a full field of view MTF diagram of the optical lens in the embodiment 1 of the present application at-30℃.

[0021] Figure 6The optical lens in the embodiment 1 of the utility model is used for drawing the full field MTF graph of 40 DEG C. DETAILED DESCRIPTION

[0022] In order to further understand the utility model, the preferred embodiments of the utility model are described below, but it should be understood that these descriptions are only for further illustrating the features and advantages of the utility model, and are not the limitation of the utility model claims.

[0023] As Figure 1 The utility model discloses an unmanned aerial vehicle 10 degree field of view middle wave infrared lens, including first positive meniscus lens 1, negative meniscus lens 2, second positive meniscus lens 3, window piece 4, first filter 5 and second filter 6 that are coaxial and are arranged in order from front to back along the propagation direction of light, and diaphragm surface 7 is arranged between second filter 6 and image surface. First filter 5 and second filter 6 are used to filter out non-middle wave infrared band light. After light passes through first positive meniscus lens 1, negative meniscus lens 2, second positive meniscus lens 3, window piece 4, first filter 5 and second filter 6 in turn, it is imaged on the image surface through diaphragm surface 7.

[0024] In the above technical scheme, the material of the first positive meniscus lens 1 is SILICON, the radii of curvature of the front and back surfaces are 61.34mm and 121.63mm respectively, and the thickness is 6.00mm. The material of the negative meniscus lens 2 is GERMANIUM, the radii of curvature of the front and back surfaces are 292.06mm and 99.85mm respectively, the distance between the negative meniscus lens 2 and the first positive meniscus lens 1 is 9.34mm, and the thickness of the negative meniscus lens 2 is 3.40mm. The material of the second positive meniscus lens 3 is SILICON, the radii of curvature of the front and back surfaces are 163.24mm and 1348.65mm respectively, the distance between the second positive meniscus lens 3 and the negative meniscus lens 2 is 22.65mm, and the thickness of the second positive meniscus lens 3 is 4.00mm. The material of the window piece 4 is SILICON, the distance between the window piece 4 and the second meniscus lens 3 is 10.00mm, and the thickness of the window piece 4 is 2.00mm. The material of the first filter 5 is SILICON, the thickness is 1.00mm, the distance between the first filter 5 and the window piece 4 is 3.00mm, the material of the second filter 6 is SILICON, the thickness is 0.30mm, the distance between the second filter 6 and the first filter 5 is 2.20mm, the distance between the second filter 6 and the diaphragm surface 7 is 0.66mm, and the distance between the diaphragm surface 7 and the image surface is 20.47mm.

[0025] The 10° field-of-view mid-wave infrared lens for UAVs of this invention may also include a lens barrel. The lens barrel is not particularly limited; it only needs to be able to fix the aforementioned first positive meniscus lens 1, negative meniscus lens 2, second positive meniscus lens 3, window 4, first filter 5, and second filter 6. The lens barrel material is typically aluminum, with a coefficient of thermal expansion of 23.6e. -6 .

[0026] The terms used in this utility model generally have the meanings commonly understood by those skilled in the art, unless otherwise stated.

[0027] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the embodiments.

[0028] In the following embodiments, various processes and methods not described in detail are conventional methods known in the art. Unless otherwise specified, the materials, reagents, apparatus, instruments, equipment, etc., used in the following embodiments are commercially available.

[0029] Example 1

[0030] The technical specifications of the optical lens are as follows: Dimensions: φ55×85mm; Back focal length: 39.6mm; Maximum aperture: φ55mm; MTF > 0.3@30lp / mm across the entire field of view; Maximum distortion < 1% across the entire field of view; Illuminance uniformity across the entire field of view > 95%.

[0031] Based on the above technical specifications, the parameters (radius, curvature, thickness, spacing, material, etc.) of each optical element of the designed optical lens are shown in Table 1.

[0032] Table 1. Parameters of each optical element in the optical lens of Example 1

[0033]

[0034] Upon testing, the MTF of the optical lens in Example 1 across the entire field of view is as follows: Figure 2 As shown, the maximum distortion across the entire field of view is as follows: Figure 3 As shown, the uniformity of illumination across the entire field of view is as follows: Figure 4 As shown, the MTF at -30℃ across the entire field of view is as follows Figure 5 As shown, the MTF at 40°C across the entire field of view is as follows: Figure 6 As shown, the optical lens of Example 1 exhibits a high imaging transfer function, low distortion, and good uniformity. Furthermore, significant variations in ambient temperature do not substantially affect the imaging quality of the optical lens.

[0035] Obviously, the above embodiments are merely exemplary and not limiting. Based on the above description, one of ordinary skill in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to exhaust all embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A 10° field of view mid-wave infrared lens for unmanned aerial vehicles, characterized in that, It comprises a first positive meniscus lens (1), a negative meniscus lens (2), a second positive meniscus lens (3), a window sheet (4), a first filter (5) and a second filter (6) coaxially arranged in sequence along the propagation direction of light, and a diaphragm surface (7) is arranged between the second filter (6) and the image surface. The first filter (5) and the second filter (6) are both used for filtering out non-middle wave infrared light.

2. The unmanned aerial vehicle 10° field of view middle wave infrared lens according to claim 1, wherein The first positive meniscus lens (1) is made of SILICON, the radii of curvature of the front and back surfaces are 61.34mm and 121.6323mm respectively, and the thickness is 6.00mm.

3. The unmanned aerial vehicle 10° field of view middle wave infrared lens according to claim 1, wherein The negative meniscus lens (2) is made of GERMANIUM, the radii of curvature of the front and back surfaces are 292.06mm and 99.85mm respectively, the thickness is 3.40mm, and the distance between the negative meniscus lens (2) and the first positive meniscus lens (1) is 9.34mm.

4. The unmanned aerial vehicle 10° field of view middle wave infrared lens according to claim 1, wherein The second positive meniscus lens (3) is made of SILICON, the radii of curvature of the front and back surfaces are 163.24mm and 1348.65mm respectively, the thickness is 4.00mm, and the distance between the second positive meniscus lens (3) and the negative meniscus lens (2) is 22.65mm.

5. The unmanned aerial vehicle 10° field of view middle wave infrared lens according to claim 1, wherein The window sheet (4) is made of SILICON, the thickness is 2.00mm, and the distance between the window sheet (4) and the second positive meniscus lens (3) is 10.00mm.

6. The unmanned aerial vehicle 10° field of view middle wave infrared lens according to claim 1, wherein The first filter (5) is made of SILICON, the thickness is 1.00mm, and the distance between the first filter (5) and the window sheet (4) is 3.00mm.

7. The unmanned aerial vehicle 10° field of view middle wave infrared lens according to claim 1, wherein The second filter (6) is made of SILICON, the thickness is 0.30mm, the distance between the second filter (6) and the first filter (5) is 2.20mm, the distance between the second filter (6) and the diaphragm surface (7) is 0.66mm, and the distance between the diaphragm surface (7) and the image surface is 20.47mm.

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