Precise Prediction of Optical Performance for Near Infrared Instrument Using Adaptive Fitting Line
| Autor: | Kyeongyeon Ko, Jeong-Yeol Han, Jakyoung Nah, Heeyoung Oh, In-Soo Yuk, Chan Park, Moo-Young Chun, Jae Sok Oh, Kang-Min Kim, Hanshin Lee, Ueejeong Jeong, Daniel T. Jaffe |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
instrument: infrared spectrograph 1. INTRODUCTION Infrared optical systems are operated at low temperature and vacuum (LT-V) condition to minimize thermal noise. In general
the manufacture assembly and alignment of optical systems are performed at room temperature and non-vacuum (RT-NV) condition. If the temperature and pressure conditions alter the physical changes of optical and opto-mechanical parts occur (Kaneda et al. 2005 Leviton et al. 2005) and this drives the optical performance variation. For visible light optical systems that are operated at RT-NV condition the tasks of alignment and performance measurement after measurement are also performed at RT-NV condition and thus the alignment process is intuitive (Kim et al. 2005 Liu et al. 2005 Kim et al. 2007 Kim et al. 2009). However for infrared optical systems that are operated at LT-V condition assembly is performed at RT- wavefront error prediction and no adjustment philosophy instrument: infrared spectrograph Astronomy QB1-991 |
| Zdroj: | Journal of Astronomy and Space Sciences, Vol 30, Iss 4, Pp 307-314 (2013) |
| Druh dokumentu: | article |
| ISSN: | 2093-5587 2093-1409 |
| DOI: | 10.5140/JASS.2013.30.4.307 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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