Calibrator Design for the COBE Far Infrared Absolute Spectrophotometer (FIRAS)

@article{Mather1998CalibratorDF,
  title={Calibrator Design for the COBE Far Infrared Absolute Spectrophotometer (FIRAS)},
  author={John C. Mather and Dale J. Fixsen and Richard Arrick Shafer and Carol L. Mosier and David Todd Wilkinson},
  journal={The Astrophysical Journal},
  year={1998},
  volume={512},
  pages={511 - 520}
}
The photometric errors of the external calibrator for the Far Infrared Absolute Spectrophotometer (FIRAS) instrument on the COBE are smaller than the measurement errors on the cosmic microwave background radiation (CMBR) spectrum (typically 0.02 MJy sr-1, 1 σ) and smaller than 0.01% of the peak brightness of the CMB. The calibrator is a reentrant cone, shaped like a trumpet mute, made of Eccosorb iron-loaded epoxy. It fills the entire beam of the instrument and is the source of its accuracy… 

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