扫描式超高速摄影中转镜镜面变形量的几何补偿  

Advance Deforming Mirror Faces of Rotating Mirror for Streak Camera

作　　者：黄虹宾[1] 柴金龙[1] 龚向东[2] 李景镇[2] 孙凤山[3] 何铁锋[2] 

机构地区：[1]深圳大学机电与控制工程学院,广东深圳518060 [2]深圳大学电子科学与技术学院,广东深圳518060 [3]中国科学院西安光学精密机械研究所,西安710119

出　　处：《光子学报》2008年第5期1015-1019,共5页Acta Photonica Sinica

基　　金：深圳大学科研启动基金(200504)资助

摘　　要：利用三维有限元计算技术,分析了从三面体到八面体铝合金转镜镜面变形规律.发现以四面体为界,三面体转镜镜面变形为向内凹进,五面体及以上转镜镜面则向外凸出·在对镜面变形定量分析基础上,提出了镜面变形的几何补偿方法,即采用柱面代替平直镜面,使镜面变形后的位置趋近于平直·结果表明,对镜面尺寸17.32mm,轴向长度32.5mm的三面体铝合金转镜,在5×104rpm下,镜面最高点偏离平直镜面的最大值为0.468μm,是平直镜面的1/9,与相同结构尺寸的铍转镜镜面变形量处于相同量级·说明铝合金转镜采用几何补偿方法,可以在扫描式摄影系统中代替铍转镜·The elastic deformations of mirror surfaces from three-faced to eight-faced rotating mirrors were analyzed by 3-D FEM. The results indicates that the deformation patterns of all operation can be distinguished into three kinds： the surface of three-faced mirror is retuse, the aluminous mirrors in surface of four-faced mirror looks like a saddle, and the shapes of whole surface express crowning outward for five, six, seven and eight-faced mirrors. The method of advance deformation for mirror faces was brought up on the basis of quantificational analysis： the even mirror faces are replaced with cylindrical surface so that the faces in operation can be flattened up. The results show that the relative departure magnitude between vertex of surface and even surface is 0. 468 8m which is 1/9 times of even surface deformation magnitude for the mirror that mirror surface is 17.32 mm width and 32.5 mm length, and the rotate speed is 5×10^4 rpm, and that the even surface of beryllium mirror is approximately 0.17 μm of deformation magnitude. So the aluminous mirror that its surfaces are cylindrical can replaces Be mirror.

关 键 词：扫描式超高速摄影 转镜镜面 几何补偿 有限元方法 

分 类 号：TB872[一般工业技术—摄影技术]