Far-IR calibration sources for cryogenic focal planes

Beeman, Jeff, Haller, Eugene E., Collins, P., Hargrave, Peter Charles ORCID: https://orcid.org/0000-0002-3109-6629 and Pisano, Giampaolo ORCID: https://orcid.org/0000-0003-4302-5681 2002. Far-IR calibration sources for cryogenic focal planes. Presented at: Far-IR, Sub-mm & MM Detector Technology Workshop, Monterey, CA, USA, 1-3 April 2002.

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Abstract

Photoconductor and bolometer arrays used in cryogenic telescopes often suffer from response variations to a given photon flux. Thermal drifts, ionizing radiation absorption, and changes in optical components and their alignment can all effect photometric accuracy. A stable, low power, in-situ calibration lamp can help quantify and mitigate these effects without substantially diminishing cryogen (and therefore observation) lifetime. We have developed a small, lightweight IR source, based on a reverse-bolometer approach, that can achieve a greybody output (10K to 300K nominal) with a few mW input power. They have survived cryogenic shake testing, are repeatable within 0.8% over 94,000 cycles, and can be mounted directly to a cryogenic surface. Design details and performance results will be discussed.

Item Type:	Conference or Workshop Item (Poster)
Date Type:	Completion
Status:	Unpublished
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Additional Information:	Poster Session 3.11
Related URLs:	Organisation Organisation
Last Modified:	27 Oct 2022 09:38
URI:	https://orca.cardiff.ac.uk/id/eprint/66984

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