Research On Cophase Detection System Of Segmented Primary Mirror Camera

As the increasingly wide applications of Segmented Primary Mirror(SPM) Optical Remote Sensor on large-aperture high-performance space telescope, Cophase Error Detection(CED) has become one of the important missions to achieve SPM optical system imaging. Aiming at solving CED problems faced by SPM technology, research group has proposed a method based on Dispersed Rayleigh Interferometry(DRI) Theory to detect piston error. With the theory, research group has researched principle prototype and testing system in the 973 National Defense Project. The system has disadvantages of large volume, large weight, long period of measurement time and mechanical movement. In order to overcome the weaknesses of the former detection system and verify the DRI theory further, the article intends to research a CED system aiming at Coaxial Three-Mirror Configuration Camera. So as to design the new CED system, the article begins research from the four aspects as follows: detection theory, functional requirements, overall design, assembly and debugging.After analyzing the theory of CED, the article concludes the weaknesses of the former detection system and raise design requirements of new detection system accordingly. On structural style, the two former mutually perpendicular detection light path is folded, merged, and share one common chassis and case, thus making the detection system more compact, more complete and more instrumental. On detection function, the system uses parallel detection method, which means the two sampling channels of secondary mirrors share one common dispersion prism and camera, thus avoid mechanical movement. Meanwhile, in order to monitor environmental turbulence and system vibration, then compensate piston error measurement results, a monitoring channel is added to the piston error detection light path. Besides, the article researches an easily operated dispersion prism insert structure, which is a function switching structure in piston error detection light path, and achieves function switch between instrument matching debugging and detection. The detection system designed by the article has advantages of faster measurement, more reliable results and better operability. In addition, all the components of the new detection system will be designed, drafted, processed and installed. The detection system will be matched in real detection light path finally, and keep on debugging for CED.