High performance infrared lens used in aerospace optical remote sensing systems have great benefit in resource exploration, pollution monitoring etc. However the high technical threshold of manufacture, the production and launch cost due to the heavy infrared optical materials, and the long period of alignment have restricted its use especially for civil and commercial aerospace. Here we present a realization of aerospace infrared lens for mass production. An unique opto-mechanical structure design has been implemented in order to meet the requirements of the mass production of space infrared lens. Some high effective, low cost processing technology are used both for optical and mechanical parts. The produced lenses have the biggest diameter of 300mm and the best RMS of λ/50(λ=632.8nm). A smart alignment based on an online device with lens alignment and image quality measurement reduces the period from 30 days to 7 days. With the well assembled infrared lens, the space camera has a system wavefront of 0.1λRMS (λ=3.39μm) and the MTF of 0.38(@25lp/mm).
With the development of remote sensing technology, users' demands for agility and high resolution are becoming increasingly high. Beijing No.3 Satellite is a new type of optical remote sensing satellite with ultra-high agility, high resolution and large swath. Operating in about 500kmSun-synchronous orbit, it can obtain the ground pixel resolution of panchromatic 0.5m/multi-spectral 2m at the satellite nadir point with a width of more than 23km. According to user indicators and engineering implementation difficulties, a dual camera optical splicing method is adopted to increase the camera width and reduce the development difficulty of the camera's optical and mechanical structure. The splicing process adopts the combination processing method to ensure the high precision and stability of the splicing angle of dual cameras. In terms of opto-mechanical structure, the stability is ensured through the integrated design of the mirror and the support structure. Thein-orbit commission shows that the camera resolution and swath meets the users’ requirement, the image is clear and the quality is high, indicating that the camera's optical and mechanical structure has high stability and demonstrate the effectiveness of the approaches proposed.
Aiming at the problems of poor safety, reliability and assembly consistency of manual assembly of large segmented optical components, a dual manipulator automatic assembly method is proposed. First of all, a modular automatic assembly system is built, and the interactive cooperation mode of dual robotic arms is adopted to realize the function exchange of the two robotic arms and meet the requirements of a wider and larger visual identification and assembly range. Then, the 3D spatial grasping and assembly relationship is established by the “point cloud stitching” technology based on marker points, and the system calibration is completed. Finally, a “step-by-step” point-by-point approximation assembly strategy is proposed, which corrects the error through binocular vision guidance to improve the final assembly accuracy, which meets the requirements of high assembly accuracy and strong consistency of large-scale segmented optical components.
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