An infrared target simulation system and method

Abstract

The present application relates to the field of infrared simulation technology, and particularly relates to an infrared target simulation system and method. The present application provides an infrared target simulation system, comprising a coupling unit, a first collimating unit, a second collimating unit, a first infrared light source and a second infrared light source; the first infrared light source and the second infrared light source are used for emitting infrared light waves, the first collimating unit and the second collimating unit are respectively used for shaping the scattered light emitted by the first infrared light source and the scattered light emitted by the second infrared light source into parallel light beams, and the coupling unit is used for coupling the parallel light beams emitted by the first collimating unit and the parallel light beams emitted by the second collimating unit into a parallel light beam. The present application provides an infrared target simulation system and method, which can simulate infrared targets in different scenes.

Description

Technical Field

[0001] This invention relates to the field of infrared simulation technology, and in particular to an infrared target simulation system and method. Background Technology

[0002] Infrared simulation technology is an important technology applied to infrared imaging equipment.

[0003] In related technologies, infrared simulation mainly utilizes physical simulation. However, physical simulation is subject to many limitations due to practical constraints and cannot test all weather conditions and background environments.

[0004] Therefore, in order to address the above shortcomings, there is an urgent need for an infrared target simulation system and method that can simulate different scenarios. Summary of the Invention

[0005] This invention provides an infrared target simulation system and method that can simulate infrared targets in different scenarios.

[0006] In a first aspect, embodiments of the present invention provide an infrared target simulation system, including a coupling unit, a first collimation unit, a second collimation unit, a first infrared light source, and a second infrared light source;

[0007] The first infrared light source and the second infrared light source are used to emit infrared light waves. The first collimation unit and the second collimation unit are used to shape the scattered light emitted by the first infrared light source and the scattered light emitted by the second infrared light source into parallel beams, respectively. The coupling unit is used to couple the parallel beam emitted by the first collimation unit and the parallel beam emitted by the second collimation unit into a single parallel beam.

[0008] In one possible design, the coupling unit is at an angle of 45° to the parallel light it emits, and the optical axis of the first collimating unit is perpendicular to the optical axis of the second collimating unit.

[0009] In one possible design, a beam expander unit is also included, which is used to expand the parallel beam emitted from the coupling unit.

[0010] In one possible design, the beam expander unit includes, in sequence along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The fifth lens is used to receive the outgoing parallel beam from the coupling unit. The first lens is a positive meniscus with a concave surface bent towards the image side. The second lens is a plano-concave negative lens with a flat surface facing the object side. The third lens is a negative meniscus with a concave surface bent towards the image side. The fourth and fifth lenses are positive and negative meniscuses with concave surfaces bent towards the object side, respectively.

[0011] In one possible design, the first collimation unit includes a sixth lens, a seventh lens, an eighth lens, and a ninth lens along the optical axis. The ninth lens is used to receive scattered light emitted by the first infrared light source. The sixth lens is a negative meniscus with a concave surface curving towards the object side, the seventh lens is a negative meniscus with a concave surface curving towards the image side, the eighth lens is a positive convex lens, and the ninth lens is a plano-concave negative lens with its plane facing towards the object side.

[0012] In one possible design, the second collimation unit includes a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens along the optical axis. The thirteenth lens is used to receive scattered light emitted by the second infrared light source. The tenth lens is a negative meniscus with its concave surface curving towards the object side, the eleventh lens is a negative meniscus with its concave surface curving towards the image side, the twelfth lens is a positive convex lens, and the thirteenth lens is a plano-concave negative lens with its plane facing towards the object side.

[0013] In one possible design, the beam expander unit includes an objective lens group and an eyepiece lens group, and the magnification of the beam expander unit is designed using the following formula:

[0014]

[0015] Wherein, τ is the magnification of the beam expander, f1 is the focal length of the objective lens group, and f2 is the focal length of the eyepiece group.

[0016] In one possible design, the entrance pupil diameter of the beam expander, the focal length of the beam expander, the aperture of the first collimator, and the focal length of the first collimator satisfy the following formula:

[0017]

[0018]

[0019] Wherein, D is the entrance pupil diameter of the beam expander, f is the focal length of the beam expander, D1 is the aperture of the first collimating unit, f3 is the focal length of the first collimating unit, and τ is the magnification of the beam expander.

[0020] In one possible design, the entrance pupil diameter of the beam expander, the focal length of the beam expander, the aperture of the second collimator, and the focal length of the second collimator satisfy the following formula:

[0021]

[0022]

[0023] Wherein, D is the entrance pupil diameter of the beam expander, f is the focal length of the beam expander, D2 is the aperture of the second collimating unit, f4 is the focal length of the second collimating unit, and τ is the magnification of the beam expander.

[0024] Secondly, embodiments of the present invention provide an infrared target simulation method, based on any of the infrared target simulation systems described above, the infrared target simulation method comprising:

[0025] Infrared light waves are emitted using the first infrared light source and the second infrared light source;

[0026] The first collimation unit and the second collimation unit are used to shape the scattered light emitted by the first infrared light source and the scattered light emitted by the second infrared light source into parallel beams, respectively.

[0027] The coupling unit is used to couple the parallel beam emitted from the first collimating unit and the parallel beam emitted from the second collimating unit into a single parallel beam.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] In this embodiment, the first infrared light source and the second infrared light source can respectively emit scattered light simulating the target and scattered light simulating the background environment. The scattered light emitted by the first infrared light source and the second infrared light source is shaped by the first collimation unit and the second collimation unit respectively to form two parallel beams. The two parallel beams are coupled into a single beam carrying both target information and environmental background information through a coupling unit. The solution provided in this application can flexibly simulate the infrared characteristics of targets in different scenarios. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of an infrared target simulation system provided in an embodiment of the present invention.

[0032] In the picture:

[0033] 1-Beam expander unit;

[0034] 11-First lens;

[0035] 12-Second lens;

[0036] 13-Third lens;

[0037] 14-Fourth lens;

[0038] 15 - Fifth Lens;

[0039] 2-Coupled unit;

[0040] 3-First collimation unit;

[0041] 31-Sixth lens;

[0042] 32-Seventh Lens;

[0043] 33 - Eighth Lens;

[0044] 34 - Ninth Lens;

[0045] 4-Second collimation unit;

[0046] 41 - The tenth lens;

[0047] 42 - Eleventh Lens;

[0048] 43 - Twelfth Lens;

[0049] 44 - The thirteenth lens;

[0050] 5-First infrared light source;

[0051] 6-Second infrared light source. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0053] In the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or stated, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0054] In this specification, it should be understood that the directional terms such as "upper" and "lower" used in the description of the embodiments of the present invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present invention. Furthermore, in the context, it should also be understood that when it is mentioned that one element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0055] like Figure 1 As shown, this embodiment of the invention provides an infrared target simulation system, including a coupling unit 2, a first collimation unit 3, a second collimation unit 4, a first infrared light source 5, and a second infrared light source 6;

[0056] The first infrared light source 5 and the second infrared light source 6 are used to emit infrared light waves. The first collimation unit 3 and the second collimation unit 4 are used to shape the scattered light emitted by the first infrared light source 5 and the scattered light emitted by the second infrared light source 6 into parallel beams, respectively. The coupling unit 2 is used to couple the parallel beam emitted by the first collimation unit 3 and the parallel beam emitted by the second collimation unit 4 into a single parallel beam.

[0057] In this embodiment, the first infrared light source 5 and the second infrared light source 6 can respectively emit scattered light simulating the target and scattered light simulating the background environment. The scattered light emitted by the first infrared light source 5 and the second infrared light source 6 is shaped by the first collimation unit 3 and the second collimation unit 4 to form two parallel beams. The two parallel beams are coupled by the coupling unit 2 into a single beam carrying both target information and environmental background information. Through the solution provided in this application, the infrared characteristics of the target under different scenarios can be flexibly simulated.

[0058] In this embodiment, each unit is composed of lenses, and all lenses are made of colorless optical glass and are spherical lenses.

[0059] In this embodiment, both the first infrared light source 5 and the second infrared light source 6 can be resistor arrays.

[0060] In some embodiments of the present invention, the angle between the coupling unit 2 and the parallel light emitted by it is 45°, and the optical axis of the first collimating unit 3 and the optical axis of the second collimating unit 4 are perpendicular.

[0061] In this embodiment, the angle between the coupling unit 2 and the parallel light it emits is 45°, and the optical axis of the first collimating unit 3 and the optical axis of the second collimating unit 4 are perpendicular. This arrangement facilitates the system's optical path debugging and provides ample space for the various optical components.

[0062] In some embodiments of the present invention, a beam expanding unit 1 is also included, which is used to expand the parallel beam emitted from the coupling unit 2.

[0063] In this embodiment, the beam expanding system can amplify the parallel beam emitted from the coupling unit 2 by a certain factor. The amplification factor of the beam expanding system can be designed according to requirements.

[0064] In some embodiments of the present invention, the beam expanding unit 1 includes, in sequence along the optical axis, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15. The fifth lens 15 is used to receive the outgoing parallel beam from the coupling unit 2. The first lens 11 is a positive meniscus with a concave surface bent towards the image side. The second lens 12 is a plano-concave negative lens with a flat surface facing the object side. The third lens 13 is a negative meniscus with a concave surface bent towards the image side. The fourth lens 14 and the fifth lens 15 are positive and negative meniscus with concave surfaces bent towards the object side, respectively.

[0065] In this embodiment, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14 and the fifth lens 15 work together to eliminate phase difference while expanding the beam. At the same time, the structure is simple, occupies little space, and is easy to adjust the optical path.

[0066] In this embodiment, the first lens 11 and the fourth lens 14 are made of SILICON optical glass, and the second lens 12 and the third lens 13 are made of GERMANIUM optical glass.

[0067] In some embodiments of the present invention, the first collimation unit 3 includes a sixth lens 31, a seventh lens 32, an eighth lens 33 and a ninth lens 34 along the optical axis. The ninth lens 34 is used to receive the scattered light emitted by the first infrared light source 5. The sixth lens 31 is a negative meniscus with a concave surface bent towards the object side, the seventh lens 32 is a negative meniscus with a concave surface bent towards the image side, the eighth lens 33 is a positive convex lens, and the ninth lens 34 is a plano-concave negative lens with its plane facing towards the object side.

[0068] In this embodiment, the sixth lens 31, the seventh lens 32, the eighth lens 33 and the ninth lens 34 can eliminate phase difference while collimating, and also take advantage of simple structure.

[0069] In some embodiments of the present invention, the second collimation unit 4 includes a tenth lens 41, an eleventh lens 42, a twelfth lens 43 and a thirteenth lens 44 along the optical axis. The thirteenth lens 44 is used to receive the scattered light emitted by the second infrared light source 6. The tenth lens 41 is a negative meniscus with its concave surface bent towards the object side, the eleventh lens 42 is a negative meniscus with its concave surface bent towards the image side, the twelfth lens 43 is a positive convex lens, and the thirteenth lens 44 is a plano-concave negative lens with its plane facing towards the object side.

[0070] In this embodiment, the tenth lens 41, the eleventh lens 42, the twelfth lens 43 and the thirteenth lens 44 can eliminate phase difference while collimating, and also take advantage of simple structure.

[0071] In some embodiments, the eighth lens 33, the ninth lens 34, and the eleventh lens 42 are made of SILICON optical glass, and the ninth lens 34 is made of GERMANIUM optical glass. The twelfth lens 43, the thirteenth lens 44, and the fifteenth lens are made of SILICON optical glass, and the fourteenth lens is made of GERMANIUM optical glass.

[0072] In some embodiments of the present invention, the beam expander 1 includes an objective lens group and an eyepiece lens group, and the magnification of the beam expander 1 is designed by the following formula:

[0073]

[0074] Where τ is the magnification of beam expander 1, f1 is the focal length of the objective lens group, and f2 is the focal length of the eyepiece group.

[0075] In this embodiment, the focal point of the beam expander 1 can be used as the basis for dividing the objective lens group and the eyepiece group. For example, the first lens 11, the second lens 12, and the third lens 13 form the eyepiece group, and the fourth lens 14 and the fifth lens 15 form the objective lens group. By designing the focal lengths of the objective lens group and the eyepiece group, the magnification of the beam expander 1 can be adjusted. For example, the infrared target simulation system operates in the 3-5 μm band, has a field of view of ±4°, a focal length of 180 mm, an F-number of 3.6, an entrance pupil distance > 1000 mm (which can be 1032 mm), an entrance pupil diameter of 50 mm, and a total length of 695 mm for the entire optical path system. Based on the parameters of the infrared system described above, the focal lengths of the eyepiece group and the objective lens group can be designed to achieve a magnification τ = 2.5 × 1000 mm.

[0076] In some embodiments of the present invention, the entrance pupil diameter of the beam expanding unit 1, the focal length of the beam expanding unit 1, the aperture of the first collimating unit 3, and the focal length of the first collimating unit 3 satisfy the following formula:

[0077]

[0078]

[0079] Where D is the entrance pupil diameter of beam expander 1, f is the focal length of beam expander 1, D1 is the aperture of first collimation unit 3, f3 is the focal length of first collimation unit 3, and τ is the magnification of beam expander 1.

[0080] In this embodiment, f is 180mm, so D1 = 20mm and f3 = 72mm can be calculated.

[0081] In some embodiments of the present invention, the entrance pupil diameter of the beam expanding unit 1, the focal length of the beam expanding unit 1, the aperture of the second collimating unit 4, and the focal length of the second collimating unit 4 satisfy the following formula:

[0082]

[0083]

[0084] Where D is the entrance pupil diameter of beam expander 1, f is the focal length of beam expander 1, D2 is the aperture of second collimation unit 4, f4 is the focal length of second collimation unit 4, and τ is the magnification of beam expander 1.

[0085] Secondly, embodiments of the present invention provide an infrared target simulation method, which, based on any of the infrared target simulation systems described above, includes:

[0086] Infrared light waves are emitted using the first infrared light source 5 and the second infrared light source 6.

[0087] The first collimation unit 3 and the second collimation unit 4 are used to shape the scattered light emitted by the first infrared light source 5 and the scattered light emitted by the second infrared light source 6 into parallel beams, respectively.

[0088] The parallel beam emitted from the first collimating unit 3 and the parallel beam emitted from the second collimating unit 4 are coupled into a single parallel beam using the coupling unit 2.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An infrared target simulation system, characterized in that, It includes a coupling unit (2), a first collimation unit (3), a second collimation unit (4), a first infrared light source (5), and a second infrared light source (6); The first infrared light source (5) and the second infrared light source (6) are used to emit infrared light waves. The first collimation unit (3) and the second collimation unit (4) are used to shape the scattered light emitted by the first infrared light source (5) and the scattered light emitted by the second infrared light source (6) into parallel beams, respectively. The coupling unit (2) is used to couple the parallel beam emitted by the first collimation unit (3) and the parallel beam emitted by the second collimation unit (4) into a single parallel beam. It also includes a beam expander (1), which is used to expand the parallel beam emitted from the coupling unit (2); The beam expanding unit (1) includes, in sequence along the optical axis, a first lens (11), a second lens (12), a third lens (13), a fourth lens (14), and a fifth lens (15). The fifth lens (15) is used to receive the outgoing parallel beam from the coupling unit (2). The first lens (11) is a positive meniscus with a concave surface bent towards the image side. The second lens (12) is a plano-concave negative lens with a flat surface facing the object side. The third lens (13) is a negative meniscus with a concave surface bent towards the image side. The fourth lens (14) and the fifth lens (15) are positive and negative meniscus with concave surfaces bent towards the object side, respectively. The first collimation unit (3) includes a sixth lens (31), a seventh lens (32), an eighth lens (33), and a ninth lens (34) along the optical axis. The ninth lens (34) is used to receive the scattered light emitted by the first infrared light source (5). The sixth lens (31) is a negative meniscus with a concave surface curving towards the object side. The seventh lens (32) is a negative meniscus with a concave surface curving towards the image side. The eighth lens (33) is a positive convex lens. The ninth lens (34) is a plano-concave negative lens with a plane facing towards the object side. The second collimation unit (4) includes a tenth lens (41), an eleventh lens (42), a twelfth lens (43), and a thirteenth lens (44) along the optical axis. The thirteenth lens (44) is used to receive the scattered light emitted by the second infrared light source (6). The tenth lens (41) is a negative meniscus with a concave surface curving towards the object side. The eleventh lens (42) is a negative meniscus with a concave surface curving towards the image side. The twelfth lens (43) is a positive convex lens. The thirteenth lens (44) is a plano-concave negative lens with a plane facing towards the object side.

2. The infrared target simulation system according to claim 1, characterized in that, The angle between the coupling unit (2) and the parallel light it emits is 45°, and the optical axis of the first collimating unit (3) is perpendicular to the optical axis of the second collimating unit (4).

3. The infrared target simulation system according to claim 1, characterized in that, The beam expander unit (1) includes an objective lens group and an eyepiece group, and the magnification of the beam expander unit (1) is designed by the following formula: Wherein, τ is the magnification factor of the beam expander (1). f 1 represents the focal length of the objective lens group. f 2 is the focal length of the eyepiece group.

4. The infrared target simulation system according to claim 1, characterized in that, The entrance pupil diameter of the beam expander (1), the focal length of the beam expander (1), the aperture of the first collimation unit (3), and the focal length of the first collimation unit (3) satisfy the following formula: Where D is the entrance pupil diameter of the beam expander (1), f D1 is the focal length of the beam expander (1), and D1 is the aperture of the first collimator (3). f 3 is the focal length of the first collimation unit (3), and τ is the magnification of the beam expander unit (1).

5. The infrared target simulation system according to claim 1, characterized in that, The entrance pupil diameter of the beam expander (1), the focal length of the beam expander (1), the aperture of the second collimator (4), and the focal length of the second collimator (4) satisfy the following formula: Where D is the entrance pupil diameter of the beam expander (1), f D1 is the focal length of the beam expander (1), and D2 is the aperture of the second collimator (4). f 4 is the focal length of the second collimation unit (4), and τ is the magnification of the beam expander unit (1).

6. A method for simulating infrared targets, characterized in that, Based on the infrared target simulation system according to any one of claims 1-5, the infrared target simulation method includes: Infrared light waves are emitted using the first infrared light source (5) and the second infrared light source (6); The first collimation unit (3) and the second collimation unit (4) are used to shape the scattered light emitted by the first infrared light source (5) and the scattered light emitted by the second infrared light source (6) into parallel beams, respectively. The parallel beam emitted from the first collimating unit (3) and the parallel beam emitted from the second collimating unit (4) are coupled into a single parallel beam using the coupling unit (2).

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