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Precise Prediction of Optical Performance for Near Infrared Instrument Using Adaptive Fitting Line
Ko, Kyeongyeon,Han, Jeong-Yeol,Nah, Jakyoung,Oh, Heeyoung,Yuk, In-Soo,Park, Chan,Chun, Moo-Young,Oh, Jae Sok,Kim, Kang-Min,Lee, Hanshin,Jeong, Ueejeong,Jaffe, Daniel T. 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.4
Infrared optical systems are operated at low temperature and vacuum (LT-V) condition, whereas the assembly and alignment are performed at room temperature and non-vacuum (RT-NV) condition. The differences in temperature and pressure between assembly/alignment environments and operation environment change the physical characteristics of optical and opto-mechanical parts (e.g., thickness, height, length, curvature, and refractive index), and the resultant optical performance changes accordingly. In this study, using input relay optics (IO), among the components of the Immersion GRating INfrared Spectrograph (IGRINS) which is an infrared spectrograph, a simulation based on the physical information of this optical system and an actual experiment were performed; and optical performances in the RT-NV, RT-V, and LT-V environments were predicted with an accuracy of 0.014±0.007 λ rms WFE, by developing an adaptive fitting line. The developed adaptive fitting line can quantitatively control assembly and alignment processes below λ/70 rms WFE. Therefore, it is expected that the subsequent processes of assembly, alignment, and performance analysis could not be repeated.
OPTICAL SURVEY WITH KMTNET FOR DUSTY STAR-FORMING GALAXIES IN THE AKARI DEEP FIELD SOUTH
정웅섭,Kyeongyeon Ko,김민진,고종완,Sam Kim,Jeonghyun Pyo,김성진,김태현,Hyun Jong Seo,Won-Kee Park,Sung-Joon Park,Min Gyu Kim,Dong Jin Kim,Sang-Mok Cha,Yongseok Lee,CHUNG-UK LEE,Seung-Lee Kim,Shuji Matsuura,Chris Pea 한국천문학회 2016 Journal of The Korean Astronomical Society Vol.49 No.5
We present an optical imaging survey of \textit{AKARI} Deep Field South (ADF-S) using the Korea Microlensing Telescope Network (KMTNet), to find optical counterparts of dusty star-forming galaxies. The ADF-S is a deep far-infrared imaging survey region with \textit{AKARI} covering around 12 deg$^2$, where the deep optical imaging data are not yet available. By utilizing the wide-field capability of the KMTNet telescopes ($\sim$4 deg$^2$), we obtain optical images in \textit{B}, \textit{R} and \textit{I} bands for three regions. The target depth of images in \textit{B}, \textit{R} and \textit{I} bands is $\sim$24 mag (AB) at 5$\sigma$, which enables us to detect most dusty star-forming galaxies discovered by \textit{AKARI} in the ADF-S. Those optical datasets will be helpful to constrain optical spectral energy distributions as well as to identify rare types of dusty star-forming galaxies such as dust-obscured galaxy, sub-millimeter galaxy at high redshift.
Detector Mount Design for IGRINS
Jae Sok Oh,Chan Park,Sang-Mok Cha,In-Soo Yuk,Kwijong Park,Kang-Min Kim,Moo-Young Chun,Kyeongyeon Ko,Heeyoung Oh,Ueejeong Jeong,Jakyoung Nah,Hanshin Lee,Daniel T. Jaffe 한국우주과학회 2014 Journal of Astronomy and Space Sciences Vol.31 No.2
The Immersion Grating Infrared Spectrometer (IGRINS) is a near-infrared wide-band high-resolution spectrograph jointly developed by the Korea Astronomy and Space Science Institute and the University of Texas at Austin. IGRINS employs three HAWAII-2RG Focal Plane Array (H2RG FPA) detectors. We present the design and fabrication of the detector mount for the H2RG detector. The detector mount consists of a detector housing, an ASIC housing, a Field Flattener Lens (FFL) mount, and a support base frame. The detector and the ASIC housing should be kept at 65 K and the support base frame at 130 K. Therefore they are thermally isolated by the support made of GFRP material. The detector mount is designed so that it has features of fine adjusting the position of the detector surface in the optical axis and of fine adjusting yaw and pitch angles in order to utilize as an optical system alignment compensator. We optimized the structural stability and thermal characteristics of the mount design using computer-aided 3D modeling and finite element analysis. Based on the structural and thermal analysis, the designed detector mount meets an optical stability tolerance and system thermal requirements. Actual detector mount fabricated based on the design has been installed into the IGRINS cryostat and successfully passed a vacuum test and a cold test.
Detector Mount Design for IGRINS
Oh, Jae Sok,Park, Chan,Cha, Sang-Mok,Yuk, In-Soo,Park, Kwijong,Kim, Kang-Min,Chun, Moo-Young,Ko, Kyeongyeon,Oh, Heeyoung,Jeong, Ueejeong,Nah, Jakyoung,Lee, Hanshin,Jaffe, Daniel T. The Korean Space Science Society 2014 Journal of Astronomy and Space Sciences Vol.31 No.2
The Immersion Grating Infrared Spectrometer (IGRINS) is a near-infrared wide-band high-resolution spectrograph jointly developed by the Korea Astronomy and Space Science Institute and the University of Texas at Austin. IGRINS employs three HAWAII-2RG Focal Plane Array (H2RG FPA) detectors. We present the design and fabrication of the detector mount for the H2RG detector. The detector mount consists of a detector housing, an ASIC housing, a Field Flattener Lens (FFL) mount, and a support base frame. The detector and the ASIC housing should be kept at 65 K and the support base frame at 130 K. Therefore they are thermally isolated by the support made of GFRP material. The detector mount is designed so that it has features of fine adjusting the position of the detector surface in the optical axis and of fine adjusting yaw and pitch angles in order to utilize as an optical system alignment compensator. We optimized the structural stability and thermal characteristics of the mount design using computer-aided 3D modeling and finite element analysis. Based on the structural and thermal analysis, the designed detector mount meets an optical stability tolerance and system thermal requirements. Actual detector mount fabricated based on the design has been installed into the IGRINS cryostat and successfully passed a vacuum test and a cold test.