Miniaturized large-aperture thermal imaging refraction-super hybrid lens and thermal imager

Abstract

The invention discloses a miniaturized large-aperture refraction-super hybrid thermal imaging refraction-super hybrid lens and a thermal imager, and belongs to the field of optical lenses, and the lens comprises a first lens and a second lens which are sequentially arranged from an object plane to an image plane along an optical axis. According to the invention, a folding and super hybrid system is formed by combining a super-surface lens and a traditional lens, the super-surface can flexibly regulate and control the characteristics of phase, amplitude, polarization and the like of light waves on the sub-wavelength scale, and mature micro-nano processing technologies such as electron beam lithography, nano-imprinting and the like and diversified materials are adopted; the characteristics help to reduce the size and weight of the lens of an optical system, reduce the cost of raw materials, and realize the miniaturization, light weight and integrated design of thermal imaging equipment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical lenses, and particularly relates to a miniaturized large-aperture thermal imaging fold super hybrid lens and a thermal imager. BACKGROUND

[0002] Thermal imaging technology is a technology that uses infrared radiation emitted by objects to detect and image, and plays an important role in many fields such as military, medical, and industrial. The development of thermal imaging technology stems from the need for non-contact temperature measurement and night observation. In low-light or no-light environments, traditional optical imaging relying on visible light is severely limited. However, all objects with a temperature higher than absolute zero will emit infrared radiation. By detecting these radiations, imaging can be achieved without the need for visible light. Infrared radiation is part of the electromagnetic spectrum, with a wavelength range of about 0.75 microns to 1000 microns, covering the main band of thermal radiation.

[0003] A thermal imager collects infrared radiation through an optical system, a detector converts the radiation into an electrical signal, a signal processing unit amplifies and processes the signal, and finally a display device presents a thermal image. Among them, the optical system is an important part of the thermal imager, and the design and quality of the optical system directly affect the overall performance of the thermal imager such as imaging quality and detection sensitivity. Traditional thermal imaging fold super hybrid lenses are mainly designed by multiple refractive lens groups, but the infrared materials used are expensive, the multi-piece structure leads to large volume and weight, and the functional expansion is limited. These problems restrict the miniaturization, portability and cost control of thermal imaging equipment.

[0004] With the advancement of technology, the thin and lightweight characteristics of metasurface technology and the potential of using mature micro-nano processing technology and low-cost dielectric materials provide a new direction for solving the shortcomings of traditional lenses. Metasurface is a two-dimensional planar material composed of subwavelength structure units (usually nanoscale), which can flexibly control the phase, amplitude and polarization of light waves by precisely designing the geometry, size and arrangement of these structure units. It can realize the functions of traditional optical elements on a subwavelength scale, greatly reducing the volume and weight of the optical system, replacing traditional thick lenses, achieving ultra-thin and lightweight optical design, and being easier to integrate into various devices. In addition, metasurface can be produced using mature micro-nano processing technologies such as electron beam lithography and nano-imprinting. In the future, it can be mass-produced at low cost with wafer-level manufacturing, and the material is diversified, not limited to noble metals (such as gold and silver), but also can use dielectric materials such as titanium dioxide and silicon nitride, greatly reducing the cost of raw materials.

[0005] As an improvement scheme, a hyper-hybrid system formed by combining a hyperlens and a traditional lens is proposed, which can realize the required optical path length in a compact space by optical path folding, reduce the size of the traditional lens, and is expected to maintain high imaging resolution and low manufacturing cost. However, the effective application of the hyper-hybrid system in the field of thermal imaging, and the design of a thermal imaging hyper-hybrid lens that simultaneously has the characteristics of miniaturization and large aperture, is still a major challenge for current technology. SUMMARY

[0006] The application provides a miniaturized large-aperture thermal imaging hyper-hybrid lens and a thermal imager, aiming to reduce the size and cost of the optical system while meeting the requirements of high-quality imaging and realizing athermalization design.

[0007] To solve the above technical problems, the purpose of the present application is achieved by the following technical scheme: a thermal imaging hyper-hybrid lens is provided, which includes a first lens and a second lens arranged in order along the optical axis from the object plane to the image plane;

[0008] At least one of the first lens and the second lens is a hyperlens;

[0009] The thermal imaging hyper-hybrid lens satisfies: 25.0≤F×BFL×D 12 ≤50.0;

[0010] Wherein, F represents the aperture value of the thermal imaging hyper-hybrid lens, BFL represents the back focus of the optical system, i.e. the distance from the image side of the second lens to the imaging plane, and D 12 is the effective area size of the image side of the first lens.

[0011] Further, the first lens is a non-spherical Fresnel lens, the object side of the first lens is an even non-spherical surface, and the image side is a Fresnel surface.

[0012] Further, the first lens has positive refractive power, the object side of the first lens is convex, and the image side of the first lens is concave.

[0013] Further, the object side of the first lens has a positive radius of curvature, and the image side of the first lens has a positive radius of curvature.

[0014] Further, the second lens is a hyperlens, the hyperlens includes a substrate and micro-nano structures arranged on the substrate; the object side of the second lens has a microstructure arrangement, and the image side of the second lens is a plane.

[0015] Further, the distance from the optical axis center of the object side of the first lens to the image plane is the total length TTL of the optical system, and the effective focal length of the optical system is f', wherein

[0016] Further, the material of the first lens is a chalcogenide material.

[0017] Further, the substrate thickness of the second lens super surface satisfies 0.3mm≤th≤1.1mm, and the substrate material is one of amorphous silicon, crystalline silicon, borosilicate, silicon dioxide, quartz, and glass.

[0018] The micro-nano structure material of the second lens super surface is one of amorphous silicon, crystalline silicon, silicon dioxide, silicon nitride, and titanium dioxide.

[0019] Further, the aperture value of the thermal imaging fold super hybrid lens satisfies F≤1.0, the aperture is large, the light quantity is large, and the requirement of high-quality imaging is met.

[0020] The working temperature range of the thermal imaging fold super hybrid lens is -45℃ to 105℃.

[0021] Further, the MTF of the thermal imaging fold super hybrid lens satisfies: at 21lp / mm, MTF≥0.3; at 42lp / mm, MTF≥0.1, the imaging resolution is high, and a clear image can be obtained.

[0022] Optionally, the thermal imaging fold super hybrid lens further comprises a diaphragm, and the diaphragm is located before the first lens.

[0023] Further, the diaphragm is attached to the object side of the first lens.

[0024] Optionally, the thermal imaging fold super hybrid lens further comprises a protective window.

[0025] The application also provides a thermal imager comprising any of the thermal imaging fold super hybrid lenses.

[0026] The thermal imaging fold super hybrid lens provided by the embodiment of the application adopts two lenses, one of which is a chalcogenide aspheric lens, and the other is a super lens, which is small in size, saves cost, and ensures the working temperature range. Further, the first lens is set as an aspheric Fresnel lens, and the phase of the super surface is reasonably distributed, so that the thermal imaging fold super hybrid lens satisfies 30.0≤F×BFL×D 12 ≤45.0, The overall volume is small, the resolution of the thermal imaging fold super hybrid lens is high, the F number satisfies F≤1.0, the light quantity is large, and the problems of large volume and high cost in the existing thermal imaging technology are solved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0028] Figure 1 A structural schematic diagram of a thermal imaging fold super hybrid lens provided by the embodiment of the present application is shown in the figure.

[0029] Figure 2 An MTF schematic diagram of a thermal imaging fold super hybrid lens provided by the embodiment 1 of the present application is shown in the figure.

[0030] Figure 3 A distortion schematic diagram of a thermal imaging fold super hybrid lens provided by the embodiment 1 of the present application is shown in the figure.

[0031] Figure 4 An MTF schematic diagram of a thermal imaging fold super hybrid lens provided by the embodiment 2 of the present application is shown in the figure.

[0032] Figure 5 A distortion schematic diagram of a thermal imaging fold super hybrid lens provided by the embodiment 2 of the present application is shown in the figure.

[0033] Explanation of reference signs:

[0034] 110, diaphragm; 120, first lens; 130, second lens; 140, protection window; 150, imaging surface. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0036] It should be understood that, when used in the specification and the appended claims, the terms “comprise” and “include” indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms “a”, “an” and “the” are intended to include the plural forms, unless the context clearly indicates otherwise.

[0038] It should be further understood that the term "and / or" as used in the specification and in the claims, if any, means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0039] The thermal imaging fold-hybrid lens provided by the embodiment of the present application comprises a first lens 120 and a second lens 130 arranged in sequence along an optical axis from an object plane to an image plane. At least one of the first lens and the second lens is a super surface lens. The super surface lens comprises a substrate and a micro-nano structure arranged on the substrate.

[0040] As an implementable manner, the first lens 120 is a traditional lens, and the second lens 130 is a super surface lens.

[0041] Specifically, the first lens 120 is a non-spherical Fresnel lens with positive focal power, and the second lens 130 is a super surface lens. The object side of the first lens 120 is convex, and the image side is concave. The object side is an even aspheric surface, and the image side is a Fresnel surface. The object side of the first lens 120 is defined as a first surface, and the image side is defined as a second surface.

[0042] Further, the object side of the first lens 120 is designed as a convex even aspheric surface, which is mainly responsible for the initial convergence of light and the correction of part of high-order aberrations. The image side of the first lens 120 is designed as a Fresnel surface, which presents as a concave surface in a macroscopic form and is composed of a series of concentric and precise ring belt steps. The precise cooperation design of the object side and the image side of the first lens can significantly reduce the center thickness and the overall volume of the lens while maintaining high optical imaging quality, which significantly improves the overall imaging clarity and contrast of the system, and meets the requirements of miniaturization and cost control. The second lens 130 as a super surface lens can realize more precise regulation of light through its plane object side and binary image side and the microstructure arranged on the image side, further improving the imaging quality. In summary, this preferred embodiment performs well in imaging quality, optical performance and application range.

[0043] The thermal imaging fold-hybrid lens is arranged to meet the parameter requirement of 25.0≤F×BFL×D 12 ≤50.0, Under this parameter requirement, the fold-hybrid lens not only has a small overall volume, but also has excellent imaging quality and high resolution.

[0044] In this embodiment, the F number of the thermal imaging folded hyper-hybrid lens satisfies: F≤1.0. A large aperture significantly increases the lens aperture, and the infrared radiation energy (light quantity) received per unit time is proportional to the aperture area. In thermal imaging, this directly improves the signal strength of the detector, enhances the sensitivity, improves the signal-to-noise ratio, and accelerates the response speed, meeting the requirements of high-quality imaging.

[0045] In this embodiment, the metasurface lens can effectively correct aberration, and by setting at least one lens in the thermal imaging folded hyper-hybrid lens as a metasurface lens, a high-quality imaging effect can be provided. In addition, the folded hyper-hybrid lens can achieve a higher focal length and a more optimal light path folding effect, so that the required light path length can be achieved in a relatively small optical system. This feature helps to significantly reduce the volume and size of the optical system, and is expected to maintain a high imaging resolution and a low manufacturing cost.

[0046] As a feasible implementation, the material of the first lens 120 is a chalcogenide material, and the base material of the second lens 130 includes but is not limited to amorphous silicon, crystalline silicon, borosilicate, silicon dioxide, quartz, glass, and the like. The micro-nano structure material of the second lens 130 includes but is not limited to amorphous silicon, crystalline silicon, silicon dioxide, silicon nitride, titanium dioxide, and the like. By matching the positive and negative focal length temperature coefficients of the lenses through material matching, the overall focal length drift is offset, and the proportion of the optical power of each lens is adjusted, so that the total optical power of the system is not sensitive to temperature changes, realizing athermal design, which not only reduces the material cost, but also reduces the volume of the system.

[0047] In this embodiment, the thermal imaging folded hyper-hybrid lens further includes a diaphragm 110. The diaphragm 110 is located before the first lens 120, and the main function is to intercept and limit light. The specific position can be adjusted according to actual needs. Preferably, the diaphragm 110 is attached to the object side of the first lens 120, that is, the diaphragm 110 is located on the first surface of the first lens 120, so as to achieve the best imaging effect.

[0048] The thermal imaging folded hyper-hybrid lens further includes a protective window 140 arranged after the second lens 130.

[0049] Based on the above scheme, the working temperature range of the thermal imaging folded hyper-hybrid lens can be-45°C to 105°C, which can maintain stable performance and imaging quality, and adapt to various extreme environmental conditions.

[0050] The following are two preferred embodiments based on the above examples, which detail the specific optical data parameters of each lens in the thermal imaging folded hyper-hybrid lens provided by the embodiments of the present application.

[0051] Embodiment 1

[0052] Specifically, as Figure 1As shown, the thermal imaging fold hyper-hybrid lens includes a stop 110, a first lens 120, a second lens 130, a protective window 140, and an imaging surface 150 arranged in sequence along the optical axis from the object plane to the image plane. The first lens 120 is a non-spherical Fresnel lens with positive focal power, the object side is convex, the image side is concave, the object side is an even non-spherical surface, and the image side is a Fresnel surface. The second lens 130 is a metasurface lens, the object side has a microstructure arrangement, and the image side is a plane. The stop 110 is located on the first surface of the first lens 120. The incident light is limited by the stop 110, enters through the object side of the first lens 120, passes through the second lens 130 and the protective window 140, and finally converges on the imaging surface 150.

[0053] The optical parameter data of the thermal imaging fold hyper-hybrid lens can refer to the example in Table 1. The optical data parameters in Table 1 correspond to Figure 1 The thermal imaging fold hyper-hybrid lens.

[0054] Table 1

[0055] Surface No. Surface Type Radius of Curvature (mm) Pitch (mm) Material 1 Evensphere 10.19 2.63 Chalcogenide 2 Binary2 5.23 5.06 3 Binary2 Infinity 0.70 Glass 4 Standard Infinity 2.26 5 Standard Infinity 0.63 Glass 6 Standard Infinity 0.10 7 Standard Infinity -

[0056] In Table 1, the surface number is numbered according to the surface order of each lens. For example, surface number 1 represents the object side of the first lens 120, which is also the stop 110. Surface number 2 represents the image side of the first lens 120, and so on. The last surface number 7 represents the imaging surface 150. The curvature radius represents the bending degree of the lens surface. A positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side. The "Standard" represents the standard surface, the "Extended sphere" represents the extended non-spherical surface, the "Binary2" represents the binary surface, and the "Infinity" represents the plane surface. The interval represents the center axis distance from the current surface to the next surface. The units of the curvature radius and the interval are millimeters (mm).

[0057] The even non-spherical surface and the Fresnel surface basic surface type satisfy the following equation:

[0058]

[0059] Where z represents the distance of the non-spherical surface along the optical axis from its vertex, r represents the height from the optical axis, c represents the curvature 1 / R, R represents the curvature radius at the vertex of the lens, k represents the conic coefficient, Ai represents the non-spherical high-order coefficient, and p represents the normalized radial coordinate.

[0060] Where the conic coefficient k and the high-order coefficient Ai of each extended non-spherical lens are as follows in the example of Table 2.

[0061] Table 2

[0062] Surface No. a2 a3 a4 a5 a6 a7 1 1.06E-004 -7.54E-006 7.00E-007 -3.46E-008 5.05E-011 3.06E-002 2 5.17E-004 -5.08E-006 3.70E-007 1.66E-008 -6.72E-011 9.17E-002

[0063] In Table 2, 1.06E-004 represents that the coefficient a2 of the surface No. 1 is 1.06E-004, and the like.

[0064] The phase of the first lens 110 Fresnel surface and the second lens 120 super surface can refer to the examples in Table 3.

[0065] Table 3

[0066] Surface No. R1 A1 A2 A3 A4 A5 2 1 -2.11E-001 8.31E-002 -1.01E-004 6.47E-003 5.61E-002 3 1 -3.01E-001 -5.00E-002 2.04E-002 -1.72E+000 4.94E-001

[0067] In Table 3, R1 represents the normalized radius of the Fresnel surface or the super surface lens binary surface.

[0068] In the preferred embodiment of this example, the aperture value, the back focal length of the optical system and the effective area size of the second surface of the first lens satisfy F x BFL x D 12 = 27.4; the total optical length and the effective focal length satisfy

[0069] The working waveband of the thermal imaging fold super hybrid lens provided by the preferred embodiment of this example is 8-12 μm, the F number is 0.90, the entrance pupil diameter is large, the light amount is sufficient, and the resolution is high, which meets the use requirements of the thermal imaging technology.

[0070] Figure 2 The MTF diagram of the thermal imaging fold super hybrid lens provided by the embodiment of the present application, the MTF of the thermal imaging fold super hybrid lens provided by the embodiment of the present application meets: at 21 lp / mm, MTF≥0.3; at 42 lp / mm, MTF≥0.1, the imaging resolution is high, and a clear image can be obtained.

[0071] Figure 3 The distortion diagram of the thermal imaging fold super hybrid lens provided by the embodiment of the present application, the distortion of the thermal imaging fold super hybrid lens provided by the embodiment of the present application is small, the image distortion degree is small, and the requirement of high-quality imaging can be met.

[0072] Embodiment 2

[0073] Specifically, the thermal imaging fold super hybrid lens comprises, in sequence from an object plane to an image plane along an optical axis, an aperture stop 110, a first lens 120, a second lens 130, a protective window 140, and an imaging plane 150; the first lens 120 is a Fresnel lens with positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface, the object side surface of which is an even aspheric surface, and the image side surface of which is a Fresnel surface; the second lens 130 is a super surface lens, the object side surface of which has a microstructure arrangement, and the image side surface of which is a plane; the aperture stop 110 is located on the first surface of the first lens 120; incident light passes through the restriction of the aperture stop 110, enters through the object side surface of the first lens 120, passes through the second lens 130 and the protective window 140, and finally converges on the imaging plane 150.

[0074] The optical parameter data of the thermal imaging fold super hybrid lens can refer to the example in Table 4, and the optical data parameters in Table 4 correspond to the thermal imaging fold super hybrid lens shown in Table 4. Figure 1

[0075] Table 4

[0076] Surface No. Surface Type Radius of Curvature (mm) Pitch (mm) Material 1 Evensphere 11.52 2.45 Chalcogenide 2 Binary2 6.15 4.02 3 Binary2 Infinity 0.50 Glass 4 Standard Infinity 3.92 5 Standard Infinity 0.63 Glass 6 Standard Infinity 0.10 7 Standard Infinity -

[0077] In Table 4, the surface number is numbered according to the surface order of each lens, for example, the surface number 1 represents the object side surface of the first lens 120, which is also the aperture stop 110, the surface number 2 represents the image side surface of the first lens 120, and so on, and the last surface number 7 represents the imaging plane 150. Among them, the curvature radius represents the bending degree of the lens surface, the positive value represents that the surface bends to the image side, and the negative value represents that the surface bends to the object side, the "Standard" represents the standard surface, the "Extended sphere" represents the extended aspheric surface, the "Binary2" represents the binary surface, and the "Infinity" represents that the surface is a plane; the interval represents the center axis distance from the current surface to the next surface, and the units of the curvature radius and the interval are millimeters (mm).

[0078] The even aspheric surface and the Fresnel surface basic surface type satisfy the following equation:

[0079]

[0080] Wherein, z represents the distance of the aspheric surface along the optical axis from the vertex thereof, r represents the height from the optical axis, c represents the curvature 1 / R, R represents the curvature radius at the vertex of the lens; k represents the conic coefficient, Ai represents the high-order coefficient of the aspheric surface, and p represents the normalized radial coordinate.

[0081] Wherein, the conic coefficient k and the high-order coefficient Ai of each extended aspheric lens are as shown in the following Table 5.

[0082] Table 5

[0083] Surface No. a2 a3 a4 a5 a6 a7 1 1.30E-004 3.87E-004 5.15E-002 -4.52E-004 9.35E-010 1.29E-004 2 3.85E-004 -1.04E-006 5.23E-007 1.78E-008 -2.71E-09 2.85E-002 ​

[0084] In Table 5, 1.30E-004 represents that the coefficient A2 of the surface No. 1 is 1.30E-004, and so on.

[0085] The phase of the first lens 110 Fresnel surface and the second lens 120 super surface can refer to the examples in Table 6.

[0086] Table 6

[0087]

[0088]

[0089] In Table 6, R1 represents the normalized radius of the Fresnel surface or the binary surface of the super surface lens.

[0090] In the preferred embodiment of this example, the following relationships are satisfied between the aperture value, the back focal length of the optical system, and the effective area size of the second surface of the first lens: F x BFL x D 12 = 46.0; and the total optical length and the effective focal length satisfy

[0091] The working waveband of the thermal imaging fold super hybrid lens provided by the embodiment is 8-12 μm, the F number is 0.95, the entrance pupil diameter is large, the light amount is sufficient, and the resolution is high, which meets the use requirements of the thermal imaging technology.

[0092] Figure 4 The MTF diagram of the thermal imaging fold super hybrid lens provided by the embodiment is shown, and the MTF of the thermal imaging fold super hybrid lens provided by the embodiment meets: when 21 lp / mm, MTF≥0.3; when 42 lp / mm, MTF≥0.1, the imaging resolution is high, and a clear image can be obtained.

[0093] Figure 5 The distortion diagram of the thermal imaging fold super hybrid lens provided by the embodiment is shown, and the distortion of the thermal imaging fold super hybrid lens provided by the embodiment is small, the image distortion degree is small, and the requirement of high-quality imaging can be met.

[0094] In summary, the thermal imaging fold super hybrid lens provided by the embodiment has the advantages of small volume, low cost, clear imaging, and can meet the requirements of high-quality imaging and integration and light weight.

[0095] Embodiment 1 and embodiment 2 respectively meet the following relationships shown in Table 7:

[0096] Table 7

[0097]

[0098]

[0099] The embodiment of the present application also provides a thermal imager comprising the thermal imaging folding and superimposing lens.

[0100] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A miniaturized, large-aperture thermal imaging hybrid lens, characterized in that, It includes a first lens and a second lens arranged sequentially along the optical axis from the object plane to the image plane; at least one of the first lens and the second lens is a metasurface lens; The thermal imaging hyperspectral hybrid lens satisfies: 25.0 ≤ F × BFL × D 12 ≤50.0; Where F represents the aperture value of the thermal imaging hybrid lens, BFL represents the back focal length of the optical system, i.e., the distance from the image-side surface of the second lens to the image plane, and D... 12 This indicates the effective area size of the image-side surface of the first lens.

2. The thermal imaging hyperspectral hybrid lens according to claim 1, characterized in that, The first lens is an aspherical Fresnel lens, with the object side being an even-order aspherical surface and the image side being a Fresnel surface; The first lens has positive optical power, the object side of the first lens is convex, and the image side of the first lens is concave. The object-side surface of the first lens has a positive radius of curvature, and the image-side surface of the first lens has a positive radius of curvature.

3. The thermal imaging hyperspectral hybrid lens according to claim 1, characterized in that, The second lens is a metasurface lens, which includes a substrate and a micro / nano structure disposed on the substrate; The object side of the second lens has a microstructure arrangement, and the image side of the second lens is a plane.

4. The thermal imaging hyperspectral hybrid lens according to claim 3, characterized in that, The substrate material of the second lens is one of amorphous silicon, crystalline silicon, borosilicate, silicon dioxide, quartz, and glass, and the substrate thickness satisfies 0.3mm≤th≤1.1mm; The micro / nano structure material of the second lens is one of amorphous silicon, crystalline silicon, silicon dioxide, silicon nitride, and titanium dioxide.

5. The thermal imaging hyperspectral hybrid lens according to claim 2, characterized in that, The first lens is made of a chalcogenide material.

6. The thermal imaging hyperspectral hybrid lens according to claim 1, characterized in that, The thermal imaging hyperspectral hybrid lens satisfies: Where TTL represents the distance from the center of the optical axis on the object side of the first lens to the image plane, f ' This indicates the effective focal length of the optical system.

7. The thermal imaging hyperspectral hybrid lens according to claim 1, characterized in that, The thermal imaging superconducting lens also includes an aperture stop, which is located in front of the first lens.

8. The thermal imaging hyperspectral hybrid lens according to claim 7, characterized in that, The aperture is attached to the object side of the first lens.

9. The thermal imaging hyperspectral hybrid lens according to claim 1, characterized in that, It also includes protective windows.

10. The thermal imaging hyperspectral hybrid lens according to claim 1, characterized in that, The aperture value of the thermal imaging refractive-hybrid lens satisfies F≤1.0; the operating temperature range of the thermal imaging refractive-hybrid lens is -45℃~105℃.

11. The thermal imaging hyperspectral hybrid lens according to claim 1, characterized in that, The MTF of the thermal imaging hyperspectral hybrid lens satisfies the following conditions: when the resolution of the thermal imaging hyperspectral hybrid lens is 21 lp / mm, the MTF ≥ 0.3; when the resolution of the thermal imaging hyperspectral hybrid lens is 42 lp / mm, the MTF ≥ 0.

1.

12. A thermal imager, characterized in that, Includes any one of the thermal imaging hyper-hybrid lenses according to claims 1-11.

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