Discrete support technology has been widely used in the mirror support of space optical remote sensor due to its high lightweight and good environmental adaptability. In this paper, a six point discrete structure is designed to meet the high force and thermal stability requirements of a lightweight mirror with a diameter of Φ550mm in a high-resolution space camera. Through the analysis of the mirror stiffness and the adaptability under various environmental effects such as gravity, temperature, shrinkage of glue spots and overload, the rationality of the structural design is verified, and the indicators meet the application requirements of space optical remote sensor.
This paper analyzes the optical characteristics of the filter as a plane-parallel plate glass, and discusses the influence of the filter on the optimal focal plane position of the system according to the nature of the backward focus position, and proposes a large field of view space remote sensor sub-field of view The fixed focus scheme; through analyzing the working principle of the splicing instrument, the influence of the filter on the distance measurement of the splicing instrument is discussed, and the precautions of the mixed splicing of a variety of different filter detectors are studied, and a variety of detector confocal surfaces are obtained The calculation formula of splicing optical path difference, a variety of detectors hybrid splicing confocal surface scheme is proposed.
With the development of remote sensing satelite, the infrared and visible light parts have been integrated gradually. As the internal vibration source, the jitter of cryocooler has more and more influence on the imaging quality.At present the study of cryocooler jiiter mostly focus on the inside of the camera.We usually ignore the platform ,regard camera as a separate part,then analysis the displacement between the optical lens. But the platform and the load has the coupling relationship.The flexible platform changes the boundary of the camera.At this time,the rigid motion of the camera becomes dominant. separate research will bring bigger deviation .So two models were created which called the separated camera model and the coupled platform-camera model, then the micro-vibration transmission from the cryocooler to the optical mirrors in both cases was analysised and the relationship between coupling frequency and response size was obtained. by the way, the optical axis jitter and the deviation of the optical alignment caused by cryocooler jitter in the time domain was analysised , through optical sensitivity matrix, the change of line of sight was obtained and then the decline of MTF and the image distortion was obtained. The result shows that when the cryocooler worked, the image motion of the camera in the integration time is 0.25pixels,and the MTF is reduced by 2.5%,but the image distortion can reach 0.52pixels.
With the increasing function density of space optical remote sensor, the integration of visible and infrared space camera has become an important development direction. As the main vibration, the micro-vibration of refrigerator is the key to affect the imaging quality of optical remote sensor. In this paper, three commonly used micro-vibration test methods are compared, and the fixed-support force test method is used to test and analyze the micro-vibration performance of a pulse tube refrigerator under different power and use state. It is pointed out that the strategy of using compressor vibration isolation to mount satellite is more suitable for the Visible and infrared integrated space camera.
In order to realize MTF detection without collimator, first establish an auto collimate detect system, analysis its principles and requirements. Then, simplify its optical path , give the formula of reflexed direction angle of target fringes, give the formula of its effect on MTF. Compare the coaxial system and off-axial system: target deflection caused the test MTF to drop to 87.9% of the actual MTF. Give the design method of autocollimation target, using this method, for an off-axis camera, the MTF test error due to target deflection can be reduced from 12.1% to a negligible level. Finally, discusses the splicing of detector and target, analysis the effect of filter on focal plane, propose the confocal design and splicing.
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