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Proceedings Paper

In-flight calibration sources for Herschel-SPIRE
Author(s): Peter C. Hargrave; Jeffrey W. Beeman; Patrick Andrew Collins; Iris Didschuns; Matthew J. Griffin; Brian Kiernan; Giampaolo Pisano
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Paper Abstract

SPIRE, the Spectral and Photometric Imaging Receiver, will be a bolometer instrument for ESA's Herschel satellite. The instrument comprises a three-band imaging photometer covering the 250-500 μm range, and an imaging Fourier Transform Spectrometer (FTS) covering 200-670 μm. This paper presents the requirements for and design of the photometer and spectrometer calibration/illumination sources, and the results of laboratory tests on prototypes. The photometer calibrator is an electrically heated thermal source of submillimetre radiation, the purpose of which is to provide a repeatable signal for in-flight monitoring of health and responsivity of the SPIRE photometer detectors. It is not required to provide absolute calibration or uniform illumination of the arrays, but it may be used as part of the overall calibration scheme. The spectrometer calibrator is located at a pupil at the second input port of the FTS. It is designed to enable matching of the telescope emission for a range of telescope temperature (60-90 K) and emissivity (2% - 10%). By matching the telescope emission at this port, the high background from the Herschel telescope emission can be nulled to a high degree, resulting in an interferogram in which the contribution from the astronomical source is not overwhelmed by the telescope offset. The flexibility for telescope matching inherent in the design is important, as the exact telescope parameters will be unknown until the satellite is in operation. The FTS calibrator will also be used to assist in the absolute calibration scheme for SPIRE FTS observations.

Paper Details

Date Published: 5 March 2003
PDF: 12 pages
Proc. SPIE 4850, IR Space Telescopes and Instruments, (5 March 2003); doi: 10.1117/12.461781
Show Author Affiliations
Peter C. Hargrave, Cardiff Univ. (United Kingdom)
Jeffrey W. Beeman, Lawrence Berkeley National Lab. (United States)
Patrick Andrew Collins, Cardiff Univ. (United Kingdom)
Iris Didschuns, Cardiff Univ. (United Kingdom)
Matthew J. Griffin, Cardiff Univ. (United Kingdom)
Brian Kiernan, Cardiff Univ. (United Kingdom)
Giampaolo Pisano, Cardiff Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 4850:
IR Space Telescopes and Instruments
John C. Mather, Editor(s)

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