FTS: Fourier transform spectrometer onboard ASTRO-F/FIS

Hidenori Takahashi; Mitsunobu Kawada; Noriko Murakami; Keita Ozawa; Hiroshi Shibai; Takao Nakagawa

doi:10.1117/12.461637

5 March 2003 FTS: Fourier transform spectrometer onboard ASTRO-F/FIS

Hidenori Takahashi, Mitsunobu Kawada, Noriko Murakami, Keita Ozawa, Hiroshi Shibai, Takao Nakagawa

Proceedings Volume 4850, IR Space Telescopes and Instruments; (2003) https://doi.org/10.1117/12.461637
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

Far-Infrared Surveyor (FIS) is one of the two focal plane instruments of ASTRO-F which is a Japanese infrared astronomical satellite and is planned to launch in 2004. The FIS has spectroscopic capability by a Fourier transform spectrometer (FTS) covering 50-200cm^-1 with spectral resolution of 0.2-0.33 cm^-1 in addition to the primary purpose of FIS (an all-sky photometric survey). The Martin-Puplett interferometer is adopted as the method for spectroscopy in order to achieve high optical efficiency in a wide wavelength range. The most important issue of the FTS is the development of driving mechanism in order to scan a moving mirror with high optical performances. By the present we succeed to develop the driving mechanism satisfying a lot of limitations and requirements as a instrument onboard satellite. Furthermore the wire-grid polarizers are evaluated in optical performance, these are usable for polarized interferomter. We also measure FIR spectrum using Spectroscopy mode of FIS, and many absorption lines of H₂O are detected on continuum spectrum of atmosphere. And the interferogram and spectrum are derived at low temperature (2K) that is practically used in space. The spectrum resembles expected one which are considered with optical components for flight model. The detection limit are estimated combining performances of optical components and detectors, the FISP has sufficient performance to archive objective sciences. FTS will provide a lot of astronomical information; determination of the SED in high-z objects detected by the survey observation of ASTRO-F, the redshift of such objects, and the physical conditions that are hard to be derived by optical/NIR-MIR observations, from FIR lines.

Citation Download Citation

Hidenori Takahashi, Mitsunobu Kawada, Noriko Murakami, Keita Ozawa, Hiroshi Shibai, and Takao Nakagawa "FTS: Fourier transform spectrometer onboard ASTRO-F/FIS", Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); https://doi.org/10.1117/12.461637

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