Design And Analysis Of Sub-Aperture Stitching Scanning Adjusting Mount

In recent years,with the development of space optics,astronomical optics,inertial confinement fusion,ground-based space target detection and recognition and other high-tech fields towards large-caliber and large-relative-caliber direction,the traditional methods of measuring lens processing quality are facing enormous challenges.In traditional full-aperture measurement methods,a large-aperture interferometer is usually needed,and a standard component with the same or larger size as the detected component is used.However,as the caliber of the detected component becomes larger and larger,produce a large-caliber standard component with high accuracy is more difficult,longer production cycle and double production cost is needed.The appearance of subaperture stitching interferometry solves the problem of quality detection of large-aperture optical lenses very well.It continues having high accuracy of interferometry,and needn’ t to use the standard surface that is same with total aperture dimension,it can reduce cost and can obtain wave surface’ s high frequency information that was cut by large aperture interferometer.In the sub-aperture stitching measurement system,the optical adjustable frame is the core component,and its motion accuracy will directly determine the accuracy of the stitching test.In this paper,a four-dimensional high precision and high resolution optical adjusting frame is designed for sub-aperture stitching interferometry of optical flat.The main work of this paper shows as follows:Firstly,according to the requirements of motion function and technical index,the structural design scheme of adjusting mount for large aperture optical planar mirror is put forward,including principle design,calculation for degree of freedom,servo feed system design,detailed design of important parts,precision design and topological optimization design.Secondly,according to the actual working environment of the laboratory,the dynamic performance of the adjusting mount is analyzed.The finite element analysis model of the adjusting mount is established.The modal analysis and random vibration analysis of the adjusting mount are carried out by using the finite element analysis software,and the stability of the adjusting mount is verified.Thirdly,according to the design requirements of the control system,the control system of the adjusting frame is designed.The inverse solution model of adjusting mount lens position is deduced.According to the functional requirements of the input module,a human-computer interaction interface is designed.Finally,the accuracy of the adjusting mount and the straightness of the guide rail are tested by standard testing methods.The test data are processed and the curve is drawn,and the causes of the errors are analyzed.