
Proceedings Paper
The cold focal plane chopper of HERSCHEL's PACS instrumentFormat | Member Price | Non-Member Price |
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Paper Abstract
HERSCHEL's 3.5 m primary mirror will be passively cooled to T ~ 80 K in the L2 orbit. In order to reduce the effects of the remaining high thermal background on the sensitive far infrared detectors (60..210 μm), a focal plane chopper is a vital element in the entrance optics of the imaging and spectroscopic instrument PACS. A gold coated 32 × 26 mm2 plane mirror, suspended by two flexural pivots and driven by a linear motor, allows for precise square wave chopping with up to 9° throw at a frequency 10 Hz with a position accuracy of 1 arcmin. The power required at T ~ 4 K is about 1 mW. The chopper has undergone an extensive qualification programme, including 650 million cold chop throws, 15 cold-warm-cold thermal cycles, 3-axis 26 G-vibration at T ~ 4 K etc. Five models were built and thoroughly tested; the flight model of the chopper is now integrated into the flight model of PACS, ready for the HERSCHEL/PLANCK launch in 2008 by an ARIANE5 rocket and the following 5-year mission.
Paper Details
Date Published: 6 July 2006
PDF: 12 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 627325 (6 July 2006); doi: 10.1117/12.671271
Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)
PDF: 12 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 627325 (6 July 2006); doi: 10.1117/12.671271
Show Author Affiliations
Oliver Krause, Max-Planck-Institut für Astronomie (Germany)
Dietrich Lemke, Max-Planck-Institut für Astronomie (Germany)
Ralph Hofferbert, Max-Planck-Institut für Astronomie (Germany)
Armin Böhm, Max-Planck-Institut für Astronomie (Germany)
Dietrich Lemke, Max-Planck-Institut für Astronomie (Germany)
Ralph Hofferbert, Max-Planck-Institut für Astronomie (Germany)
Armin Böhm, Max-Planck-Institut für Astronomie (Germany)
Ulrich Klaas, Max-Planck-Institut für Astronomie (Germany)
Josef Katzer, Carl Zeiss AG (Germany)
Frank Höller, Carl Zeiss AG (Germany)
Manfred Salvasohn, Carl Zeiss AG (Germany)
Josef Katzer, Carl Zeiss AG (Germany)
Frank Höller, Carl Zeiss AG (Germany)
Manfred Salvasohn, Carl Zeiss AG (Germany)
Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)
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