To solve the problem of machining accuracy of a convex blazed grating for an Offner imaging spectrometer by diamond turning limiting the imaging quality of the optical system, analyze the effect of Poisson burr on the diffraction efficiency of convex blazed grating, investigate the effect of the layout of blazed grating on the convex surface on the machining accuracy, and compare the performance of cutting convex gratings with microcrystalline aluminum RSA6061 and RSA6061 + chemically plated NiP for two workpiece materials. Turning with a 4-axis ultra-precision machining system yielded a convex blazed grating with a substrate radius of curvature R=41.104mm, substrate diameter of 14mm, the grating density of 53.97 line/mm, and blaze angle of about 3.8°. Cutting experiments show that RSA6061+ chemically plated NiP material is better for convex grating processing; the blaze angle error is better with the equal-along-projection layout than with the equal-along-arc layout; Poisson burr height is about 0.3μm; and the average roughness of the final grating blaze surface is less than 5nm to meet the processing quality requirements.
In this paper, the optical design and evaluation of the large field of view infrared imaging system are first carried out based on new optical components such as free-form surface. And the aluminum alloy material is selected as the optical substrate material, and the optical machine design is performed based on the design idea of structural function integration. In the last the mechanical properties and thermal stability of the optical-mechanical structure of the system are analyzed to explore the environmental adaptability of the system.
With the application of single point diamond ultra-precision turning technology in optical free-form surface processing, the development of high-frequency large amplitude fast tool servo system has become a research hotspot. In this paper, a double piezoelectric ceramic fast tool servo system is designed. Its performance index is 60μm stroke at 300Hz. In this paper, the structural design principle and processing technology of the system are systematically analyzed. The stiffness analysis of the system were carried out by using the finite element analysis software to verify the performance of the high-frequency response amplitude of the system. In this paper, the key technology research on the structure design of double piezoelectric ceramic fast tool servo system provides the basis for improving the machining accuracy and efficiency of the fast tool servo system.
In recent years, requirements such as over-the-horizon, high resolution, large field of view, wide spectrum and dexterity have pointed out new directions for the development of optical imaging systems. Common optical surfaces such as planes and spherical surfaces have been difficult to meet the requirements of optical indicators. It is often necessary to use multiple high-precision complex optical surfaces such as high-order aspherical surfaces, off-axis aspherical surfaces, non-rotational symmetric curved surfaces, microstructured optical array surfaces and freeform surfaces. This brings processing, testing and adjustment in terms of problems, the monolithic multisurface optics as a new type of optical element are increasingly attracting researchers' attention.
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