The Study On Optical Performance Of Optical Reflecting Mirror By Single Point Diamond Turning

Since high efficiency and high quality can be achieved, single point diamondturning (SPDT) is the main process. However, certain defects are found in themanufacturing process that limits its applications.To make SPDT technology get a wider range application in machining opticalmirrors, cone mirror is selected as a case to analyze some typical defects in details.To analyze scattering characteristic of ideal ultraprecision SPDT surface, thethreshold analysis is first conducted to get a formula to calculate the approximativecritical feedrate of disappearing1stmaximum scattering image. And then, in theKirchhoff assumption, electric field integration is derived to calculate scatteringdistribution based on electro-magnetic field fundamental theorem. Using thisintegration, with C++programming, to calculate the scattering intensity distributionfunction of the ideal SPDT surface, a precise critical feedrate can be obtained. Thetheoretical calculation analysis is suitable for explaining some phenomena such asmulti-line phenomenon in cone mirrors and multi-images phenomenon in planemirrors.To analyze scattering characteristic of non-ideal ultraprecision SPDT surfaces,the tool profile is built based on Monte-Carlo modeling method. Random roughnesssurface modal is processed by the simulating built tool. And using the electric fieldintegral formula, with C++programming, scattering intensity distribution function iscalculated to analyze the relationship between surface morphology and its scatteringcharacteristic. The theoretical calculation analysis is suitable for explaining somephenomena such as line obscurity and stray light in cone mirrors and dispersion inplane mirrors.Finally, to validate theoretical analysis and calculation, and find out morepractical turning parameters and processing conditions, cone mirror turning anddetecting experiments are conducted. First, experiments with variable feedrate areconducted, and the optimum feedrate is found out. Other suitable turning conditionsare sought to get surface with higher surface quality and optical properties. The turned optical mirror properties in-depth are analyzed, to give a usefulreference to evaluate the optical properties of SPDT optical mirror and to guide theoptimization of the machining process.