Performance of the Fourier transform spectrometer (FTS) for FIS onboard ASTRO-F

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

doi:10.1117/12.551452

12 October 2004 Performance of the Fourier transform spectrometer (FTS) for FIS onboard ASTRO-F

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

Proceedings Volume 5487, Optical, Infrared, and Millimeter Space Telescopes; (2004) https://doi.org/10.1117/12.551452
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

We have developed the imaging Fourier Transform Spectrometer (FTS) for the FIS (Far-Infrared Surveyor) onboard the ASTRO-F satellite. A Martin-Puplett interferometer is adopted to achieve high optical efficiency in a wide wavelength range. The total optical efficiency of this spectrometer is achieved 40-80% of the ideal value which is 25% of the incident flux. The wavelength range of 50-200μm is covered with two kinds of detector; the monolithic Ge:Ga photoconductor array for short wavelength (50-110μm) and the stressed Ge:Ga photoconductor array for long wavelength (110-200μm). The spectral resolution expected from the maximum optical path difference is 0.18cm^-1. In order to evaluate the spectral resolution of the FTS, we measured absorption lines of H₂O in atmosphere using the optics of the FTS with a bolometer at the room temperature. The measured line widths are consistent with the expected instrumental resolution of 0.18 cm-1. Some spectral measurements at the cryogenic temperature were carried out by using cold blackbody sources whose temperatures are controlled in a range from 20 to 50 K. The derived spectra considering with the spectral response of the system are consistent with expected ones. Spectroscopic observations with the FTS will provide a lot of astronomical information; SED of galaxies detected in the all sky survey and the physical diagnostics of the interstellar matter by using the excited atomic or molecular lines.

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Noriko Murakami, Mitsunobu Kawada, Hidenori Takahashi, Keita Ozawa, Tetsuo Imamura, Hiroshi Shibai, and Takao Nakagawa "Performance of the Fourier transform spectrometer (FTS) for FIS onboard ASTRO-F", Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); https://doi.org/10.1117/12.551452

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