Il Kweon Moon's research while affiliated with Korea Research Institute of Standards and Science and other places
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Publications (8)
We are developing three ground-based wide-field telescopes. A wide-field Cassegrain telescope consists of two hyperbolic mirrors, aberration correctors and a field flattener for a 2-degree field of view. The diameters of the primary mirror and the secondary mirror are 500 mm and 200 mm, respectively. Corrective optics combined with four lenses, a f...
A large aspheric mirror is a key component for large astronomical telescopes and high resolution satellite cameras. Since it is large and has an aspheric form, it is much more difficult to fabricate it compared to the similar size of spherical mirror. Especially, the opto-mechanical design and analysis is critical to reduce the deformation of mirro...
In the process of lithography using ultra violet light sources for semiconductor devices, most of defects are made by sub-micrometer pollutants generated at photochemical reactions. We proposed and developed a novel vibration-insensitive on-axis interferometer with a sub-micrometer lateral resolution by using the interference between two beams: one...
A new mirror mounting technique applicable to the primary mirror in a space telescope is presented. This mounting technique replaces conventional bipod flexures with flexures having mechanical shims so that adjustments can be made to counter the effects of gravitational distortion of the mirror surface while being tested in the horizontal position....
We present our design procedure for a 1-m lightweight mirror in a space
optical system. The glass mirror has three monolithic bosses at the rim
and is assembled with metallic bipod flexures. Their dimensional
parameters cannot be optimized independently with each other in a
classical design process, where optical performance is greatly affected
by...
An image motion analysis is essential for estimating the optical and the opto-mechanical performances of a wide field telescope optical system under a severe windy environment. A wide field telescope is a Richey-Chretien telescope that covers a 2° field of view with two hyperbolic mirrors, a 0.5 m primary mirror and a 0.2 m secondary mirror, and co...
We have developed a new IR optical system that consists of three mirrors and four lenses, and that operates in the temperature range 8°C-32°C. This temperature range can induce thermoelastic deformation in the lenses and their mounting subassembly, leading to a large defocus error associated with the displacement of the lenses inside the barrel. We...
An evaluation of the optical performances of metal plated contoured back lightweight mirrors was conducted using a finite element analysis program NX I-DEAS. In these analyses, two different plating materials, nickel and aluminum, were considered for an aluminum and a beryllium mirror substrate. Surface errors and individual aberration terms, such...
Citations
... Structural compliance was set as the objective function, and two variables were utilized to describe the element density and presence. Kihm et al. [8] developed a mirror design procedure, using a genetic algorithm (GA) to separate the design procedure into the mirror design problem and the flexure design problem. Chen et al. [9] studied the optimal design of a mirror for deployment in space, while considering the openback hexagonal cell size of the primary mirror and design variables of the bipod flexure. ...
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... To isolate vibration, four supporting mechanisms working as a viscous damper with 14.3 kN ․ s/m damping constant were adopted in the proposed polishing machine. To check the structural characteristics, a finite elements analysis program NX I-DEAS [10] was used. The 530,951 solid elements were introduced to take into account the deformation due to gravity. Figure 6 (a) shows the one-bodied-mainframe of the polishing machine. ...
... A number of procedures have been examined to assist in the alignment of telescopes [1][2][3][4][5][6][7][8][9][10][11][12][13]. Arguably, the most widely used quantitative methods are based upon determining the sensitivity of Zernike coefficients or Seidel coefficients to the movement of the secondary mirror [5,[8][9][10][11][12]. ...
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... Building on this foundation, Ju et al [14] conducted ray tracing method to analyze the influence of decentering lens at different positions within a vertical cavity surface emitting laser on the laser beam pointing. Lee et al [15] analyzed the image motion of the wide field telescope by dynamic responses using the finite element analysis method. Wang et al [16] proposed a model for beam pointing deviation by incorporating the response of optics to external disturbances into the matrix optical transmission process. ...
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... The rigid support uses joint mechanisms such as ball bearings or hinges to release its excess degrees of freedom to achieve the purpose of fully constraining the six degrees of freedom of the mirror. Rigid support due to the gap of the joint mechanism, which can produce friction, wear, and even collision impact in dynamic load applications, therefore, more and more optical mirrors are supported by flexible structures [14][15][16][17][18][19][20]. ...
... 79 The heat transfer problem can be computed through any of the methods while the thermo-elastic problem is usually solved by FEA. 53,[80][81][82] To compute surface deformations induced by in-orbit vibration loads, the surface deformations are computed with FEA and statistical energy analysis (SEA). The first is used to obtain the response to low-excitation frequencies, which enable a more deterministic analysis of the system. ...
