CN100405218C - Simulated dynamic target generator for aerial camera dynamic resolution test - Google Patents

Abstract

The simulated dynamic target generator for testing the dynamic resolution of aerial cameras belongs to a device for testing the dynamic resolution of aerial cameras involved in the field of photoelectric detection technology. The technical problem to be solved is to provide a dynamic resolution test for aerial cameras. Simulate a dynamic target generator, and the technical solutions include uniform illumination light source, target resolution plate, collimator, flat mirror, single-axis turntable; the target resolution plate is placed between the uniform illumination source and the collimator with parallel light On the focal plane of the tube and perpendicular to the optical axis, the plane mirror is placed in the exit light path of the collimator so that the optical axis of the collimator is aligned with the center of the plane mirror; the plane mirror is vertically installed on the single-axis turntable , so that the reflection surface of the plane reflector passes through the rotation center of the single-axis turntable table, and the plane reflector rotates with the turntable table. The generator has simple structure and convenient debugging, and is suitable for testing the dynamic resolution of various types of aerial cameras.

Description

Simulated dynamic target generator for aerial camera dynamic resolution test

1. Technical field

The invention belongs to a device for detecting the dynamic resolution of an aerial camera and relates to the technical field of photoelectric detection.

2. Technical background

Aerial cameras are generally used in marine monitoring, resource survey, aerial surveying and mapping, environmental monitoring, aerial reconnaissance and other fields. To obtain high-quality ground images, aerial cameras must have high target resolution, especially high dynamic targets. resolution.

For the detection of the dynamic resolution of the aerial camera, in the past, the method of field aviation calibration flight was usually adopted, and the dynamic resolution of the aerial camera was tested by taking images of ground targets with the aerial camera on the plane. Practice has proved that this method is costly, the cycle is long, and the test accuracy is low. Under such circumstances, people in the industry began to turn to indoor detection and research on the dynamic resolution of aerial cameras, and thus a dynamic target simulation device appeared, which is used to simulate the image movement of the target captured by aerial cameras, and realize the detection in the laboratory. Detection of dynamic resolution of aerial cameras. The detection device for the dynamic resolution of the aerial camera belongs to the high-tech category. Developed countries impose strict restrictions on foreign countries, and it is difficult to find relevant technical information. The existing technology closest to the present invention in China is Changchun Optical Precision Technology Co. The "Dynamic Resolution Detection Device for Aerospace Imaging Equipment" developed by the Institute of Mechanics and Physics, as shown in Figure 1, includes a dynamic target generator and a collimator.

The dynamic target generator includes a light source 1, a condenser 2, a front double reflector 3, a transparent target drum 4, a rear double reflector 5, a single-axis turntable table 8, and a single-axis turntable 9; the collimator includes a light pipe turning mirror 6 , collimator reflective objective lens 7. In this detection device, the light emitted by the light source 1 is uniformly illuminated on the transparent target drum 4 after passing through the condenser mirror 2 and the front double mirror 3, and the transparent target drum 4 is fixed on the single-axis turntable table 8 , under the drive of the single-axis turntable 9, it rotates together with the single-axis turntable table top 8 to form a moving target; the transparent target drum 4 is located on the focal plane of the collimator reflective objective lens 7, and along with the single-axis turntable table top 8 The image of the moving transparent target drum 4 is projected onto the measured aerospace camera 10 placed in the optical path by the collimator reflective objective lens 7 through the light pipe turning mirror 6. The dynamic resolution of the aerial camera 10 can be known from the image of the moving transparent target drum 4 . The main problems of this detection device are: the structure of the optical system is complicated, and it is difficult to debug. The test device is specially designed for aerospace remote sensors. The target pattern is evenly distributed on the transmission-type cylindrical target drum, which is difficult to design and manufacture, and the processing cost is high. It is difficult to replace, because the dynamic target drum must be placed on the focal plane of the collimator together with the single-axis turntable, and it needs to be matched with a special collimator. It is very troublesome to adjust, and it cannot be used with other ordinary light tubes.

3. Contents of the invention

In order to overcome the defects existing in the prior art, the object of the present invention is to simplify the structure of the optical system in the test equipment, to facilitate the replacement of the target, and to overcome the drawbacks caused by the one-to-one matching relationship between the tested camera and the light pipe. Motion target generator.

The technical problem to be solved by the present invention is to provide a simulated dynamic target generator for testing the dynamic resolution of an aerial camera, which is used for simulating the image movement of the target captured by the aerial camera.

The technical solution to solve technical problems is shown in Figure 2 and Figure 3: including uniform illumination light source 11, target resolution plate 12, collimator 13, parallel mirror 14, single-axis turntable table 15, single-axis turntable 16; uniform illumination The light source 11 is placed on the optical axis of the collimator 13, and the target resolution plate 12 is between the uniform illumination light source 11 and the collimator 13, placed on the focal plane of the collimator 13 and perpendicular to the optical axis,

The plane reflector 14 is placed in the outgoing light path of the collimator 13, so that the optical axis of the collimator 13 is aligned with the center of the plane reflector 14; the plane reflector 14 is vertically installed on the single-axis turntable table 15, so that the plane The reflective surface of the mirror 14 passes through the rotation center of the single-axis turntable table 15, and when the single-axis turntable 16 drives the single-axis turntable table 15 to rotate, the plane mirror 14 rotates with the single-axis turntable table 15.

Description of working principle: the uniform illumination light source 11 makes the target resolution plate 12 uniformly illuminated, and the collimator 13 projects the image of the target resolution plate 12 on its focal plane onto the plane reflector 14, and the plane reflector 14 follows The rotation of the single-axis turntable table 15 rotates, and the rotating plane mirror 14 makes the image of the target resolving power plate 12 obtained from the collimator 13 become a moving target image, which is projected to the object placed in the optical path of the plane mirror 14. Test the aerial camera 17, and the measured aerial camera 17 can know its dynamic resolution from the image of the moving target resolution plate 12 taken by it, thereby realizing the test of the dynamic resolution of the aerial camera.

The positive effects of the present invention: the simulated dynamic target generator has simple structure, convenient debugging and operation, the target pattern is a single piece, easy to design and manufacture, and low processing cost; the target is easy to replace and easy to adjust; conventional light pipes and moving target generators can be used Combined to form a detection device, it is not necessary to make a special matching collimator, and the test device is easy to establish.

4. Description of drawings

Fig. 1 is a structural schematic diagram of a dynamic resolution detection device for aerospace imaging equipment in the prior art;

Fig. 2 is a structural representation of the present invention;

FIG. 3 is a top view of FIG. 2 , used to show the mirror position of the plane mirror 14 on the turntable table 15 and the position of the aerial camera 17 under test in the optical path.

5. Specific implementation

The present invention is implemented according to the structure and position shown in Fig. 2 and Fig. 3, wherein uniform illumination light source 11,

The target resolution plate 12 and the collimator 13 adopt the FPG type system collimator produced by Hubei Yichang Huazhong Optoelectronics Co., Ltd. The uniform illumination light source and the target resolution plate are accessories of the collimator, and they are used as a set. The target resolution plate attachment is a set of multiple target resolution plates with different resolutions, which is suitable for testing aerial cameras with different dynamic resolutions. The base of the flat mirror 14 is made of optical glass, and the reflective surface with a thickness of 60mm is not less than 350× The 350mm flat mirror, the single-axis turntable table 15 and the single-axis turntable 16 adopt the single-axis rate turntable produced by Jiangxi Jiujiang Precision Testing Technology Research Institute. Table size Φ400mm; rate range 0.001°/s～400°/s; rate stability 1×10 ^-3 .

Claims (1)

1. The simulated dynamic target generator for aerial camera dynamic resolution test, including uniform illumination light source, target source, collimator, single-axis turntable table, single-axis turntable, characterized in that the simulated dynamic target generator also includes a plane reflector (14), the target source is the target resolution plate (12), the uniform illumination light source (11) is placed on the optical axis of the collimator (13), and the target resolution plate (12) is placed on the uniform illumination light source (11) ) and the collimator (13), placed on the focal plane of the collimator (13) and perpendicular to the optical axis, the plane reflector (14) is placed in the outgoing light path of the collimator (13), so that The optical axis of collimator (13) is aligned with the center of plane mirror (14); The rotation center of the axis turntable table (15), when the single axis turntable (16) drives the single axis turntable table (15) to rotate, the plane reflector (14) rotates with the rotation of the single axis turntable table (15); the collimator (13 ) project the image of the target resolution plate (12) on its focal plane onto the plane reflector (14), and the plane reflector (14) rotates with the rotation of the single-axis turntable table (15), and the rotating plane reflects Mirror (14) makes it obtain from collimator (13) the image of target resolving power plate (12) to become the target image of motion, throws to the tested aerial camera (17) that places in plane mirror (14) optical path , the measured aerial camera (17) can know its dynamic resolution from the image of the moving target resolution plate (12) it shoots.

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