A full spectrum optical target simulator

Abstract

The present invention discloses a full-spectrum light target simulator, comprising: a collimating optical system, which is an infinite light target simulation system; a light source assembly, which comprises a visible light source, a black body radiation source, and an integrating sphere homogenization system; a lifting system: the lifting system comprises a first servo motor, a guide rail, and a lifting platform; an automatic control system: the automatic control system controls the switching and lifting system of the light source assembly; wherein the collimating optical system and the light source assembly are both mounted on the lifting platform, and the light source assembly is located on one side of the collimating optical system and connected to the collimating optical system, and the light source assembly and the lifting system are both connected to the automatic control system. The present invention can perform full-spectrum image quality detection on large-aperture, long-focal-length space optical remote sensors.

Description

Technical Field

[0001] The invention relates to the field of testing of space detection equipment, and in particular to a target simulator capable of emitting full-spectrum parallel light beams. Background Art

[0002] As the aperture and focal length of space optical remote sensors increase, optical target model devices with larger apertures and longer focal lengths are needed for their detection and image quality evaluation. The larger the aperture and the longer the focal length of the optical target model device, the higher the requirements for image quality, focal plane position accuracy, and stability of the test environment. However, the guarantee of the aperture and focal length size of the optical target model device, the guarantee of the image quality level of the collimation system, the guarantee of the focal plane position accuracy of the collimation system, and even the guarantee of the stability of the test environment will eventually become difficult to achieve as the technical indicators of space optical remote sensors gradually improve. For space optical remote sensors, ground detection work is the most basic and most important work. This work is related to important issues such as whether the optical remote sensor can work smoothly in orbit and whether it can complete designated scientific research or military tasks.

[0003] At present, the manufacturing and processing technologies of large-aperture optical components have made great progress, which can further improve important indicators such as spatial resolution, light collection ability, signal-to-noise ratio and field of view of the new generation of optical remote sensors. However, this also brings new challenges to the ground detection and image quality evaluation of space optical remote sensors.

[0004] In order to solve the problems of increasing the aperture and focal length of space optical remote sensors and detecting the entire spectrum, the present invention provides a large-aperture optical target simulator with a full spectrum. Summary of the invention

[0005] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0006] The invention provides a full-spectrum large-aperture optical target simulator, which can perform full-spectrum image quality detection on a large-aperture, long-focal-length space optical remote sensor.

[0007] In order to achieve these purposes and other advantages according to the present invention, a full-spectrum optical target simulator is provided, comprising:

[0008] A collimating optical system, wherein the optical system is an infinite light target simulation system;

[0009] A light source assembly, the light source assembly comprising a visible light source, a black body radiation source, and an integrating sphere homogenization system;

[0010] Lifting system: The lifting system includes a first servo motor, a guide rail and a lifting platform;

[0011] Automatic control system: The automatic control system controls the switching and lifting system of the light source assembly;

[0012] The collimating optical system and the light source assembly are both installed on a lifting platform, and the light source assembly is located on one side of the collimating optical system and connected to the collimating optical system. The light source assembly and the lifting system are both connected to an automatic control system.

[0013] Preferably, the collimating optical system adopts a card-type structure for off-axis optimization, and correction plates for expanding the field of view and correcting aberrations are respectively provided before and after the collimating optical system. The reflection and deflection of the optical path can shorten the length of the system structure and eliminate astigmatism.

[0014] Preferably, the black body radiation source comprises a high-temperature black body furnace and a low-temperature black body furnace which can provide infrared light of different wavelength bands, thereby improving the stability and uniformity of the infrared light source.

[0015] Preferably, the visible light source is a tungsten halogen light source.

[0016] Preferably, the integrating sphere light homogenization system and the visible light source are collimated optical system visible light and near infrared band light, thus ensuring the luminous uniformity of the light source.

[0017] Preferably, a translation stage is provided below the light source assembly, the translation stage is fixed on the lifting platform via a guide rail, the translation stage is provided with a second servo motor, and the second servo motor is connected to an automatic control system. The guide rail is used for one-dimensional movement, and the translation stage can be moved to switch when a waveband is used, so as to meet the use of a light source of the full spectrum.

[0018] Preferably, it further comprises a focal plane system, which is arranged between the collimating optical system and the light source assembly and installed on the collimating optical system to be adjusted by translation before and after the focus along the optical axis.

[0019] Preferably, the focal plane system is provided with a focal plane target wheel system capable of automatically switching the target plate, which comprises:

[0020] Target wheel: It includes a chassis and a target wheel frame, and the frame is equipped with a focal plane target;

[0021] A servo controller for controlling a drive motor;

[0022] A driving motor, which is used to rotate the target wheel;

[0023] A code disc, which is arranged on the motor and is used to measure the rotation angle;

[0024] A positioning switch, which is arranged on the target wheel;

[0025] A positioning sensor is fixed on the lifting platform;

[0026] Wherein, the central hole of the chassis is connected to the rotating shaft of the driving motor, and the positioning switch and the positioning sensor are used to achieve the resetting of the target wheel.

[0027] Beneficial effects of the present invention:

[0028] 1. The full-spectrum optical target simulator has a full-spectrum spectral range, which is suitable for the detection of space remote sensing equipment within the full-spectrum spectral range;

[0029] 2. The full-spectrum optical target simulator has a fully automatic lifting system, which can automatically control the height of the simulator, making it convenient for adjustment and testing;

[0030] 3. This full-spectrum optical target simulator is a large-aperture, long-focal-length target simulator, which can test the image quality and detection performance of large-aperture space remote sensing equipment with high precision and full spectrum;

[0031] 4. The full-spectrum optical target simulator adopts a card-type off-axis optical path, which effectively reduces the size of the simulator, makes operation and testing more convenient, and reduces site requirements.

[0032] 5. The full-spectrum optical target simulator is equipped with targets of different specifications, and the target wheel can be automatically switched, realizing the function of automatically switching to simulate various different targets.

[0033] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a structural schematic diagram of the optical target simulator provided by the present invention.

[0036] Figure 2 It is a structural diagram of the collimating optical system of the optical target simulator provided by the present invention.

[0037] Figure 3 It is a schematic diagram of the focal plane component of the optical target simulator provided by the present invention.

[0038] Figure 4 It is a schematic diagram of a light source switching component of the optical target simulator provided by the present invention.

[0039] Figure 5It is a schematic diagram of the target wheel structure of the optical target simulator provided by the present invention.

[0040] Figure 6 It is a schematic diagram of the target installation structure of the optical target simulator provided by the present invention.

[0041] Figure 7 It is a schematic diagram of switching the target components of the optical target simulator provided by the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0043] It should be understood that terms such as “having”, “including” and “comprising” used herein do not specify the existence or addition of one or more other elements or combinations thereof.

[0044] In order to realize a full-spectrum optical target simulator, the present invention adopts a design method for automatic switching of light sources in each spectral band, and automatically switches and selects the light sources in the required spectral band according to usage requirements.

[0045] like Figure 1 As shown, the full spectrum optical target simulator is composed of a collimating optical system 1, a light source assembly 2, a lifting system 3, an automatic control system 4, etc.;

[0046] The collimating optical system 1 is used as a launch system of the collimated light beam of the full-spectrum optical target simulator, i.e., a simulation system of an infinitely distant optical target;

[0047] The light source assembly 2 is a component for providing and automatically switching a uniform light source for a full-spectrum light target simulator, which includes a full-spectrum integrating sphere uniform light system, a visible light source system, and a blackbody radiation light source system. The light source is installed on a fully automatic translation stage and can be automatically controlled to move and switch between light sources of different spectral bands.

[0048] The lifting system 3 is a supporting structure for installing the full-spectrum optical target simulator, and adopts a servo motor and a guide rail for lifting control to realize the automatic lifting function of the full-spectrum optical target simulator;

[0049] Control system 4 is the control system of the light source switching component and the lifting system. The control system is connected to the servo motor control system of the light source automatic switching component and the lifting mechanism through the corresponding communication interface, so as to realize the software automatic control of the switching of the light source spectrum and the automatic lifting and lowering adjustment of the light target simulator.

[0050] like Figure 2As shown, the collimating optical system 1 adopts a card-type structure for off-axis optimization, and the light path reflection and refraction can shorten the system structure length and eliminate astigmatism. Correction plates for expanding the field of view and correcting aberrations are added at the front and back to increase the field of view. The optical system has a simple structure and a small size, which is one of the advantages of the invention of the full-spectrum optical target simulator.

[0051] like Figure 3 , Figure 4 As shown, the light source assembly 3 includes a visible light source, an integrating sphere homogenization system 7, and a black body radiation source 6. The black body radiation source 6 can emit infrared light. The integrating sphere 7 and the visible light source provide the system with visible light and near-infrared light.

[0052] The black body radiation source 6 adopts a high-temperature black body furnace 8 and a low-temperature black body furnace 10, which respectively provide infrared light of different wavelength bands, thereby improving the stability and uniformity of the infrared light source.

[0053] The visible light source system adopts a tungsten halogen light source 9 and an integrating sphere homogenization system 7, which ensures the uniformity of the light emission of the light source.

[0054] The three light sources are fixed on a translation stage 11 at the same time, and are moved in one dimension by means of a guide rail. When a wave band is used, the translation stage can be moved to switch to meet the use of light sources of the full spectrum.

[0055] like Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the full-spectrum optical target simulator provided in this embodiment is provided with an automatically switchable target plate target wheel system in the focal plane system. As a preferred implementation, the focal plane target wheel 5 can be electrically translated and adjusted along the optical axis before and after the focus to meet the user's target simulation needs.

[0056] The servo motor 14 drives the target disk to rotate, and the rotation angle is controlled by the code disk 13. The code disk 13 accurately measures the rotation angle and feeds back the angle signal to the servo control system 12, so that the rotation angle can be controlled. A positioning switch 15 is installed on the edge of the target disk. When the positioning switch 15 is rotated to the position of the positioning sensor 16, the controller can detect the signal. Through this switch, the target disk is reset.

[0057] The target wheel is driven by a motor to switch the focal plane target. The number of installed targets can be determined according to requirements, and the targets are evenly distributed on the target wheel. The target wheel mainly includes a chassis 17 and six frame slots 18. The center hole of the chassis is connected to the rotating shaft of the driving motor. Preferably, the frame slot 18 on the front of the target wheel has two clearance slots and a locking annular slot. The target 20 is installed on the target wheel frame 19, and then the target wheel frame 19 is installed in the frame slot 18.

[0058] When the simulator is working, the automatic control system 4 controls the automatic switching of the light source component 2, and switches the appropriate working spectrum in real time. The light source component 2 lights up the target at the focal plane of the collimating optical system 1 (different targets can be switched by controlling the rotation of the target wheel to simulate different targets). After passing through the collimating optical system 1, the corresponding infinitely distant simulated target is emitted at the light outlet of the simulator for reception by the detection equipment and performance evaluation of the detection equipment.

[0059] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A full-spectrum optical target simulator, characterized in that: include: A collimating optical system, wherein the optical system is an infinite light target simulation system; A light source assembly, the light source assembly comprising a visible light source, a black body radiation source, and an integrating sphere homogenization system; Lifting system: The lifting system includes a first servo motor, a guide rail and a lifting platform; Automatic control system: The automatic control system controls the switching and lifting system of the light source assembly; Wherein, the collimating optical system and the light source assembly are both installed on a lifting platform, and the light source assembly is located on one side of the collimating optical system and connected to the collimating optical system, and the light source assembly and the lifting system are both connected to an automatic control system; The collimating optical system adopts a card-type structure for off-axis optimization, and correction plates for expanding the field of view and correcting aberrations are respectively arranged before and after the collimating optical system.

2. A full spectrum optical target simulator as claimed in claim 1, characterized in that: The black body radiation source comprises a high-temperature black body furnace and a low-temperature black body furnace which provide infrared light of different wavelength bands.

3. A full spectrum optical target simulator as claimed in claim 1, characterized in that: The visible light source is a tungsten halogen light source.

4. A full spectrum optical target simulator as claimed in claim 1, characterized in that: The integrating sphere light homogenization system and the visible light source provide visible light and near-infrared band light for the collimating optical system.

5. A full spectrum optical target simulator as claimed in claim 1, characterized in that: A translation platform is provided below the light source assembly, and the translation platform is fixed on the lifting platform through guide rails. The translation platform is provided with a second servo motor, and the second servo motor is connected to the automatic control system.

6. A full spectrum optical target simulator as claimed in claim 1, characterized in that: It also includes a focal plane system, which is arranged between the collimating optical system and the light source assembly and installed on the collimating optical system to adjust the focal point by translation before and after along the optical axis.

7. A full spectrum optical target simulator as claimed in claim 6, characterized in that: The focal plane system is provided with a focal plane target wheel system capable of automatically switching the target plate, which comprises: Target wheel: It includes a chassis and a target wheel frame, and the frame is equipped with a focal plane target; A servo controller for controlling a drive motor; A driving motor, which is used to rotate the target wheel; A code disc, which is arranged on the motor and is used to measure the rotation angle; A positioning switch, which is arranged on the target wheel; A positioning sensor is fixed on the lifting platform; Wherein, the central hole of the chassis is connected to the rotating shaft of the driving motor, and the positioning switch and the positioning sensor are used to achieve the resetting of the target wheel.

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