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Thermal filtering for large aperture cryogenic detector arrays

Tucker, Carole Elizabeth and Ade, Peter A. R. 2006. Thermal filtering for large aperture cryogenic detector arrays. Presented at: Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, Orlando, FL, USA, 24 -31 May 2006. Published in: Zmuidzinas, Jonas, Holland, Wayne S., Withington, Stafford and Duncan, William D. eds. Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III. SPIE Proceedings Bellingham, WA: SPIE, 62750T. 10.1117/12.673159

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Recent advances in the development of large format detector arrays for wide field astronomical applications have required the use of large aperture cryostat windows. An important consequence is the significant increase in thermal loading on the cryogens and in the stray thermal emission reaching the detectors. We have identified that a significant part of this unwanted radiation comes from re-emission of thermal power absorbed by the dielectric substrate of the metal mesh rejection filters. To overcome this we have developed a thermal filter, which preferentially reflects radiation near the 10μm thermal peak. These filters have essentially no absorption, and hence negligible emission, at these wavelengths whilst allowing high transmission of the wanted sub-millimetre bands. We report here on thermal problems with existing metal mesh filter technology and give performance data for the new filters. As a proof of concept we present data for a medium aperture instrument (QUaD1), which utilises a 200mm diameter window, both with and without thermal filters.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: detector arrays ; metals ; radiation ; sensors ; equipment and services ; filtering (signal processing) ; absorption
Publisher: SPIE
ISBN: 9780819463401
Last Modified: 04 Jun 2017 06:27

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