An optical simulation system for testing earth navigation sensors

Abstract

The invention belongs to the technical field of earth sensor inspection equipment, and discloses an optical simulation system for earth navigation sensor inspection, comprising an adjustment base, a working plate installed on the adjustment base, a virtual projection optical lens supported on the working plate by a bracket, a projection display mechanism for displaying an earth simulation image coaxially connected to the tail end of the virtual projection optical lens and fixed on the working plate; the adjustment base comprises a three-dimensional adjustment seat, a turntable is provided on the three-dimensional adjustment seat, a pitch adjustment seat is provided on the turntable, and the working plate is connected to the pitch adjustment seat; an optical simulation system is formed by a first lens barrel, a second lens barrel and a third lens barrel as well as an internal lens layout setting, the projection display mechanism provides a simulated image with a picture of the earth surface, and the working performance and stability of the earth sensor and other indicators can be inspected by using the invention.

Description

Technical Field

[0001] The invention belongs to the technical field of earth sensor testing equipment, and is particularly designed to provide an optical simulation system for testing earth navigation sensors. Background Art

[0002] With the development of the national aerospace industry, more and more optical simulators are used for specific targets. Earth navigation sensors are developed to observe specific areas on the earth's surface. In order to test the function of the sensor, it is necessary to provide an earth simulation device. For example, a Chinese patent document with publication number CN103712574A discloses an earth simulation device for testing optical detectors. The device places a light source in an earth model shell to simulate the earth. The earth model shell always has half a sphere that is transparent to light, and is connected and driven by a multi-dimensional motion combination platform, thereby realizing the function of simulating observing the earth in different earth orbits. The present invention can be widely used in simulating various optical detectors used on satellites and spacecraft to observe the earth to verify the performance of the optical detectors.

[0003] The Chinese patent document, CN106394944B after authorization announcement, discloses a rotating earth simulator for a planar array infrared earth sensor, which includes an earth infrared radiation simulation unit, an attitude simulation unit and a system control unit. The earth infrared radiation simulation unit simulates by adjusting the infrared radiation difference between the hot plate and the cold aperture; and simulates the change of orbital height by replacing the cold aperture with different apertures; the attitude simulation unit drives the earth infrared radiation simulation unit to rotate through a stepper motor to simulate the change of attitude angle; the system control unit controls the temperature difference between the hot and cold plates of the earth infrared radiation simulation unit, the stepper motor control of the attitude simulation unit and the zero switch control through an engineering computer and an electric control box. This enables the testing and calibration of the infrared earth sensor on the ground after installation. Summary of the invention

[0004] The purpose of the present invention is to propose an optical simulation system for testing earth navigation sensors based on the above-mentioned prior art, which provides a simulated image with a picture of the earth's surface for the earth navigation sensor, so as to test the working performance and stability of the earth navigation sensor. The technical solution adopted to achieve the above-mentioned purpose is:

[0005] An optical simulation system for testing earth navigation sensors comprises an adjustment base, a working plate is mounted on the adjustment base, a virtual projection optical lens is supported on the working plate by a bracket, a projection display mechanism for displaying an earth simulation image and fixed on the working plate is coaxially connected to the tail end of the virtual projection optical lens; the adjustment base comprises a three-dimensional adjustment seat, a turntable is arranged on the three-dimensional adjustment seat, a pitch adjustment seat is arranged on the turntable, and the working plate is connected to the pitch adjustment seat.

[0006] Preferably, the virtual projection optical lens includes a first lens barrel, a second lens barrel and a third lens barrel which are coaxially arranged in sequence from the front end to the rear end, the front end of the second lens barrel is threadedly connected to the rear end of the first lens barrel, the front end of the third lens barrel is threadedly connected to the rear end of the second lens barrel, a plane lens is installed in the front end of the first lens barrel, a convex lens and a biconcave lens are installed in the front end of the second lens barrel, and the convex lens is located at the front side of the biconcave lens, a convex lens column is installed in the front end of the third lens barrel, and a convex crescent lens is installed in the rear end of the third lens barrel, and the plane lens, convex lens, biconcave lens, convex lens column and convex crescent lens are coaxially arranged.

[0007] Preferably, the center thickness of the plane lens is 15 mm, and the center distance between the plane lens and the front convex lens is 5.44 mm;

[0008] The center thickness of the front convex lens is 15mm, and the center distance between the front convex lens and the biconcave lens is 102.6mm;

[0009] The center thickness of the biconcave lens is 15mm, and the center distance between the biconcave lens and the front convex lens column is 110.79mm;

[0010] The center thickness of the front convex lens column is 15mm, and the center distance between the front convex lens column and the front convex crescent lens is 20.45mm;

[0011] The center thickness of the convex crescent-shaped lens is 15 mm, and the center distance between the convex crescent-shaped lens and the projection display mechanism is 185.93 mm.

[0012] Preferably, a first pressure ring for fixing a plane lens is installed in the front end of the first lens barrel, a second pressure ring for fixing a convex lens is installed in the front end of the second lens barrel, a third pressure ring for fixing a convex lens column is installed in the front end of the third lens barrel, and a fourth pressure ring for fixing a convex crescent lens is installed in the rear end of the third lens barrel.

[0013] Preferably, a spacer ring for fine-tuning the interval between the front convex lens and the biconcave lens is provided between the front convex lens and the biconcave lens.

[0014] Preferably, when the allowable range of axial thermal deformation at the installation position of the spacer ring cannot meet the requirements by changing the material of the spacer ring, a special-shaped spacer ring is used; the special-shaped spacer ring includes a ring body, and a stress ring groove or a plurality of stress arc groove sections are circumferentially opened on the outer surface of the ring body.

[0015] Preferably, the projection display mechanism includes a shell device, in which a DMD imaging device is fixed, and a light emitting channel for emitting image light from the DMD imaging device is opened on the shell device. The tail end of the third lens barrel is threadedly connected to the shell device and is coaxially arranged with the light emitting channel. The DMD imaging device projects a simulated image of the earth into a virtual projection optical lens.

[0016] Preferably, an inclined light incident channel is provided on the light channel, and an adaptable light source is installed at the port of the light incident channel.

[0017] The beneficial effects of the present invention are as follows: an optical simulation system is formed by the first lens barrel, the second lens barrel and the third lens barrel as well as the internal lens layout arrangement, and the projection display mechanism provides a simulated image with a picture of the earth's surface. The present invention can be used to test indicators such as the working performance and stability of the earth sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a virtual projection optical lens;

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the projection display mechanism. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, the present invention includes an adjustment base 1, a working plate 3 is installed on the adjustment base 1, a virtual projection optical lens 4 is supported on the working plate 3 through a bracket 2, and a projection display mechanism 5 for displaying a simulated image of the earth and fixed on the working plate 3 is coaxially connected to the tail end of the virtual projection optical lens 4; the adjustment base 1 includes a three-dimensional adjustment seat, a turntable is provided on the three-dimensional adjustment seat, a pitch adjustment seat is provided on the turntable, and the working plate is connected to the pitch adjustment seat.

[0023] like Figure 2As shown, the virtual projection optical lens 4 includes a first lens barrel 41, a second lens barrel 43 and a third lens barrel 44 which are coaxially arranged from the front end to the rear end. The front end of the second lens barrel 43 is threadedly connected to the rear end of the first lens barrel 41, and the front end of the third lens barrel 44 is threadedly connected to the rear end of the second lens barrel 43. A plane lens 414 is installed in the front end of the first lens barrel 41, and a convex lens 410 and a biconcave lens 49 are installed in the front end of the second lens barrel 43, and the convex lens 410 is located at the front side of the biconcave lens 49, a convex lens column 47 is installed in the front end of the third lens barrel 44, and a convex crescent lens 45 is installed in the rear end of the third lens barrel 44. The plane lens 414, the convex lens 410, the biconcave lens 49, the convex lens column 47 and the convex crescent lens 45 are coaxially arranged.

[0024] Specifically, the center thickness of the plane lens 414 is 15 mm, and the center distance between the plane lens 414 and the front convex lens 410 is 5.44 mm;

[0025] The center thickness of the front convex lens 410 is 15 mm, and the center distance between the front convex lens 410 and the biconcave lens 49 is 102.6 mm;

[0026] The center thickness of the biconcave lens 49 is 15 mm, and the center interval between the biconcave lens 49 and the front convex lens column 47 is 110.79 mm;

[0027] The center thickness of the front convex lens column 47 is 15 mm, and the center interval between the front convex lens column 47 and the front convex crescent lens 45 is 20.45 mm;

[0028] The center thickness of the convex crescent lens 45 is 15 mm, and the center distance between the convex crescent lens 45 and the projection display mechanism 5 is 185.93 mm.

[0029] A first pressing ring 413 for fixing the plane lens 414 is installed in the front end of the first lens barrel 41, a second pressing ring 412 for fixing the convex lens 410 is installed in the front end of the second lens barrel 43, a third pressing ring 48 for fixing the convex lens column 47 is installed in the front end of the third lens barrel 44, and a fourth pressing ring 46 for fixing the convex crescent lens 45 is installed in the rear end of the third lens barrel 44.

[0030] At the same time, a spacer ring 42 is provided between the front convex lens 410 and the biconcave lens 49 for fine-tuning the distance between the front convex lens 410 and the biconcave lens 49. When the allowable range of axial thermal deformation of the installation position of the spacer ring 42 still cannot meet the requirements by changing the material for making the spacer ring 42, a special-shaped spacer ring is used; the special-shaped spacer ring includes a ring body, and a stress ring groove or a plurality of stress arc groove sections are circumferentially opened on the outer surface of the ring body.

[0031] like Figure 3As shown, the projection display mechanism 5 includes a housing device 53, a DMD imaging device 54 is fixed in the housing device 53, a light emitting channel 51 for emitting image light of the DMD imaging device 54 is provided on the housing device 53, the tail end of the third lens barrel 44 is threadedly connected to the housing device 53 and arranged coaxially with the light emitting channel 51, and the DMD imaging device 54 projects the simulated image of the earth into the virtual projection optical lens 4. An inclined light incident channel 52 is provided on the light incident channel 51, and an adapted light source is installed at the port of the light incident channel 52.

[0032] When the present invention is working, the DMD imaging device 54 provides a dynamic, realistic, and equivalent infinite distance target image through the third lens barrel 44, the second lens barrel 43, and the first lens barrel 41 in sequence, and provides a simulated image with a picture of the earth's surface for the earth navigation sensor, so as to test the working performance, stability, and other indicators of the earth navigation sensor.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical simulation system for testing earth navigation sensors, characterized in that: The invention comprises an adjustment base, a working plate is installed on the adjustment base, a virtual projection optical lens is supported on the working plate by a bracket, and a projection display mechanism for displaying a simulated image of the earth fixed on the working plate is coaxially connected to the tail end of the virtual projection optical lens; the adjustment base comprises a three-dimensional adjustment seat, a turntable is provided on the three-dimensional adjustment seat, a pitch adjustment seat is provided on the turntable, and the working plate is connected to the pitch adjustment seat; the virtual projection optical lens comprises a first lens barrel, a second lens barrel and a third lens barrel which are coaxially arranged in sequence from the front end to the tail end, the front end of the second lens barrel is threadedly connected to the tail end of the first lens barrel, the front end of the third lens barrel is threadedly connected to the tail end of the second lens barrel, a plane lens is installed in the front end of the first lens barrel, and a front lens is installed in the front end of the second lens barrel. A convex lens and a biconcave lens, and the front convex lens is located at the front side of the biconcave lens, a front convex lens column is installed in the front end of the third lens barrel, and a front convex crescent lens is installed in the rear end of the third lens barrel, and the plane lens, the front convex lens, the biconcave lens, the front convex lens column and the front convex crescent lens are coaxially arranged; the projection display mechanism includes a shell device, a DMD imaging device is fixed in the shell device, a light emitting channel for emitting image light of the DMD imaging device is opened on the shell device, the rear end of the third lens barrel is threadedly connected to the shell device and is coaxially arranged with the light emitting channel, and the DMD imaging device projects a simulated image of the earth into the virtual projection optical lens; an inclined light incident channel is provided on the light channel, and an adaptive light source is installed at the port of the light incident channel.

2. The optical simulation system for earth navigation sensor inspection according to claim 1, characterized in that: The center thickness of the plane lens is 15mm, and the center distance between the plane lens and the front convex lens is 5.44mm; The center thickness of the front convex lens is 15mm, and the center distance between the front convex lens and the biconcave lens is 102.6mm; The center thickness of the biconcave lens is 15mm, and the center distance between the biconcave lens and the front convex lens column is 110.79mm; The center thickness of the front convex lens column is 15mm, and the center distance between the front convex lens column and the front convex crescent lens is 20.45mm; The center thickness of the convex crescent-shaped lens is 15 mm, and the center distance between the convex crescent-shaped lens and the projection display mechanism is 185.93 mm.

3. The optical simulation system for earth navigation sensor inspection according to claim 2, characterized in that: A first pressing ring for fixing a plane lens is installed in the front end of the first lens barrel, a second pressing ring for fixing a convex lens is installed in the front end of the second lens barrel, a third pressing ring for fixing a convex lens column is installed in the front end of the third lens barrel, and a fourth pressing ring for fixing a convex crescent lens is installed in the rear end of the third lens barrel.

4. The optical simulation system for earth navigation sensor inspection according to claim 3, characterized in that: A spacer ring for fine-tuning the interval between the front convex lens and the biconcave lens is arranged between the front convex lens and the biconcave lens.

5. The optical simulation system for earth navigation sensor inspection according to claim 4, characterized in that: When the allowable range of axial thermal deformation at the installation position of the spacer ring cannot meet the requirements by changing the material of the spacer ring, a special-shaped spacer ring is used; the special-shaped spacer ring includes a ring body, and a stress ring groove or a plurality of stress arc groove sections are circumferentially opened on the outer surface of the ring body.

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