http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Single-point diamond turning of electroless nickel for flat X-ray mirror
천권수,Yoshiharu Namba 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.8
X-ray mirrors require a super-smooth surface to prevent strong X-ray scattering. We examined the fabrication possibility of the X-ray mirror by single-point diamond turning (SPDT) for electroless nickel. The stable and unstable cutting modes for the electroless nickel were obtained by observing the relative position of a diamond tool for machining. A super-smooth surface of 0.95 nm rms was achieved within the stable cutting mode. The surface roughness of the electroless nickel mirror measured with an optical profiler was compared with the X-ray reflectivity measurement. The electroless nickel mirror could be successfully used as a soft X-ray reflector and a low-pass filter for the hard X-rays.
Wolter type I x-ray focusing mirror using multilayer coatings
Chon, Kwon Su,Namba, Yoshiharu,Yoon, Kwon-Ha The Optical Society 2006 Applied optics Vol.45 No.19
<P>A multilayer coating is a useful addition to a mirror in the x-ray region and has been applied to normal incidence mirrors used with soft x rays. When a multilayer coating is used on grazing incidence optics, higher performance can be achieved than without it. Cr/Sc multilayers coated on a Wolter type I mirror substrate for a soft x-ray microscope are considered. The reflectivity and effective solid angle are calculated for Wolter type I mirrors with uniform and laterally graded multilayer coatings. The laterally graded multilayer mirror showed superior x-ray performance, and the multilayer tolerances were relaxed. This multilayer mirror could be especially useful in the soft x-ray microscope intended for biological applications.</P>
Figure tolerance of a Wolter type I mirror for a soft-x-ray microscope
Chon, Kwon Su,Namba, Yoshiharu,Yoon, Kwon-Ha The Optical Society 2007 Applied Optics Vol.46 No.14
<P>The demand for an x-ray microscope has received much attention because of the desire to study living cells at a high resolution and in a hydrated environment. A Wolter type I mirror used for soft-x-ray microscope optics has many advantages. From the mirror fabrication point of view, it is necessary to perform tolerance analysis, particularly with respect to figure errors that considerably degrade the image quality. The figure tolerance of a Wolter type I mirror for a biological application in terms of the image quality and the state-of-the-art fabrication technology is discussed. The figure errors rapidly destroyed the image quality, and the required slope error depended on the detector used in the soft-x-ray microscope.</P>
CHON, Kwon Su,NAMBA, Yoshiharu,YOON, Kwon-Ha The Japan Society of Mechanical Engineers 2006 JSME international journal Mechanical systems, mac Vol.49 No.1
<P>A Wolter type I aspheric mirror which is a key optical element used in a soft X-ray microscope requires super smooth surface and highly accurate figure. This paper deals with fabrication of the Wolter type I microscope mirror by an epoxy replication method. The required figure accuracy of the mirror optimized with surface roughness of 2nm rms and photon energy of 539eV was estimated for a prototype soft X-ray microscope. A master mandrel was prepared by single-point diamond turning and polishing, and a precise aspheric gold mirror with axial symmetry was successfully obtained from the master mandrel through replication processes. The fabricated mirror showed surface roughness of 1.12nm Ra and figure error of 34nm rms, and several mirrors could be obtained from only one master mandrel without destroying its surface roughness and shape.</P>
Single-Point Diamond Turning of Aspheric Mirror with Inner Reflecting Surfaces
Chon, Kwon Su,Namba, Yoshiharu,Yoon, Kwon Ha Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.364 No.-
<P>Grazing incidence optics used in soft X-ray microscopes require supersmooth surface and highly accurate figure. We considered the fabrication of a Wolter type I mirror, one of grazing incidence optics, with axial-symmetric inner reflecting surfaces using single-point diamond turning. Electroless nickel was chosen as reflecting material Cutting conditions for machining the inner reflecting surface were restricted because of long arm of a single-crystal diamond tool. The machined Wolter type I mirror had approximately 270 nm P-V in figure error and 3 nm Ra in surface roughness. The direct-machined Wolter type I mirror could be successfully used in a soft Xray microscope based on laser-produced X-ray source.</P>
김우순,김동현,난바의치 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
Sapphire have been ground by the ultra-precision surface grinder having a glass -ceramic spindle of extremely-low thermal expansion with various cup-type resinoid-bonded diamond wheels of #400-#3000 in grain size. Sapphire can be ground in the ductile mode. And also, the surface roughness and grinding conditions has been clarified. The smooth surface of Sapphire less than 1 nm RMS, 1nm Ra can be obtained by the ultra-precision grinding without any polishing process.
김우순,김동현,난바의치 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.5
Optical and electronic industries are using lapping and polishing processing as a final finish rather than grinding because they need more accurate parts of brittles non-metallic materials such as single crystals Sapphire has been ground by the ultra-precision surface grinder having a glass -ceramic spindle of extremely-low thermal expansion with various cup-type resinoid-bonded diamond wheels of #400 #3000 in grain size. Sapphire can be ground in the ductile mode. And also, the surface roughness and grinding conditions has been clarified. The smooth surface of Sapphire less than lnm RMS, lnm Ra can be obtained by the ultra-precision grinding without any polishing process.
김우순,김동현,난바의치 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.6
To obtain the surface roughness with range from l0nm to lmn, we need the study of ultra-precision machine, cutting condition, and materials. In this paper, the optimal cutting conditions for gem mirror surface of aluminum alloy have been examined experimentally by using ultra-precision tuning machine and single crystal diamond tool. In generally, the cutting conditions such as feed rate and depth of cut, have effect on the surface roughness in ultra-precision tuning. The result of surface roughness was measured by the ZYGO New Mew 200. Therefore, The surface roughness and cutting conditions has been clarified. The smooth surface of aluminum alloy less than lnm RMS, lnm Rmax can be obtained by the ultra-precision cutting.