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RISS 인기검색어
- 검색키워드
- 저자 : Miho Nishiyama (검색결과 2 건)
- 무료
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- 유료
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DEVELOPMENT OF A CRYOGENIC TESTING SYSTEM FOR MID-INFRARED DETECTORS ON SPICA
Miho Nishiyama,Hidehiro Kaneda,Daisuke Ishihara,Shinji Oseki,Nami Takeuchi,Takahiro Nagayama,Takehiko Wada 한국천문학회 2017 天文學論叢 Vol.32 No.1
For future space IR missions, such as SPICA, it is crucial to establish an experimental method for evaluating the performance of mid-IR detectors. In particular, the wavelength dependence of the sensitivity is important but difficult to be measured properly. We are now preparing a testing system for mid-IR Si:As/Si:Sb detectors on SPICA. We have designed a cryogenic optical system in which IR signal light from a pinhole is collimated, passed through an optical filter, and focused onto a detector. With this system, we can measure the photoresponse of the detector for various IR light using optical filters with different wavelength properties. We have fabricated aluminum mirrors which are adopted to minimize thermal distortion effects and evaluated the surface figure errors. The total wavefront error of the optical system is 1.3 μm RMS, which is small enough for the target wavelengths (20 - 37 μm) of SPICA. The point spread function measured at a room temperature is consistent with that predicted by the simulation. We report the optical performance of the system at cryogenic temperatures.
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LABORATORY EXPERIMENTS OF OFF-AXIS MIRROR OPTICS OF ALUMINUM FOR SPACE INFRARED MISSIONS
Shinji Oseki,SHINKI OYABU,DAISUKE ISHIHARA,Keigo Enya,Kanae Haze,Takayuki Kotani,HIDEHIRO KANEDA,Miho Nishiyama,Lyu Abe,Tomoyasu Yamamuro 한국천문학회 2017 天文學論叢 Vol.32 No.1
We report our research on aluminum mirror optics for future infrared astronomical satellites. For space infrared missions, cooling the whole instrument is crucial to suppress the infrared background and detector noise. In this aspect, aluminum is appropriate for cryogenic optics, because the same material can be used for the whole structure of the instrument including optical components thanks to its excellent machinability, which helps to mitigate optical misalignment at low temperatures. We have fabricated aluminum mirrors with ultra-precision machining and measured the wave front errors (WFEs) of the mirrors with a Fizeau interferometer. Based on the power spectral densities of the WFEs, we confirmed that the surface accuracy of all the mirrors satisfied the requirements for the SPICA Coronagraph Instrument. We then integrated the mirrors into an optical system, and examined the image quality of the system with an optical laser. As a result, the total WFE is estimated to be 33 nm (rms) from the Strehl ratio. This is consistent with the WFEs estimated from the measurement of the individual mirrors.
ScienceON
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