Instruments summary | NIRS | MIRS | FILM | FIRP
Near-Infrared Spectrometer (NIRS)
Near-Infrared Spectrometer (NIRS) is the shortest wavelength instrument of the IRTS forcal-plane instruments. It is grating spectrometer. The grating and two linear detector arrays (12 pixels each) cover the wavelength range from 1.4 to 4 micron. The NIRS has been designed as an instrument to carry out the absolute spectrophotometry of the diffuse celestial sources, such as the near-infrared cosmic background radiation, interstellar UIR band emission at 3.3 micron, and the zodiacal light. Fairly large beam size, 8' by 8', and moderate wavelength resolution, ΔΛ~0.13 μm, were adopted to get large throughput. The NIRS actually reached very high sensitivities for those diffuse emissions. This database includes the images at 24 wavelengths.
Specifications
Size | 135 x 154 x 102 mm3 (over all) |
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Weight | 1.18 kg |
Entrance aperture | 1.4 x 1.4 mm2 |
Field of view | 8 x 8 arcmin2 |
Temperature | 1.8 K |
Detection system
Detector | InSb |
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Element size | 1 x 0.5 mm2 (per element) |
Number of elements | 24 (2 x 12 elements) |
Wavelength coverage | 1.43-2.54 micron, 2.88-3.98 micron |
Resolution | 0.12 (0.10 at channel 1) |
Total capacitance | ~50 pF |
Readout method | Charge-integrated amplifier |
Temperature of J-FETs | ~70 K |
References
For more details, refer to the following documents.
NIRS Explanatory Supplement [PDF]
- "Flight performance of the Near-Infrared Spectrometer (NIRS)"
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M. Noda, T. Matsumoto, M. Tanaka, H. Murakami, and M. Kawada
1996, in SPIE Proc.2817, Infrared Spaceborne Remote Sensing IV ed. M. S. Scholl and B. F. Andresen, p.248-257 [ SPIE ] [ ADS ] - "Near-Infrared Spectrometer on the Infrared Telescope in Space"
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Manabu Noda, Toshio Matsumoto, Shuji Matsuura, Kunio Noguchi, Masahiro Tanaka, and Mark L. Lim
1994, The Astrophysical Journal, vol.428, p. 363-369 [ ADS ]