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Infrared filters for cryogenic millimeterwave receivers

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Abstract

Filters are required to block infrared radiation from the low temperature regions of cryogenic receivers to reduce thermal loading and temperature gradients. The design and analysis of PTFE filters mounted on the radiation shield of a closed-cycle Joule-Thompson 4 K refrigerator is described. Calculations of the thennal transmission and emission of the filters are compared with measurements. It was found that the filters were not as effective as expected since the heat sinking of the material to the radiation shield was poor, but the overall heat load was less than anticipated since a thermal gradient developed across the polystyrene foam vacuum window, reducing its infrared emission.

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Authors and Affiliations

  1. National Radio Astronomy Observatory, 949 N. Cherry Avenue, Campus Building 65, 85721-0655, Tucson, Arizona, USA

    James W. Lamb

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  1. James W. Lamb
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NRAO is operated under co-operative agreement with the National Science Foundation.

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Lamb, J.W. Infrared filters for cryogenic millimeterwave receivers. Int J Infrared Milli Waves 14, 959–967 (1993). https://doi.org/10.1007/BF02084572

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  • DOI: https://doi.org/10.1007/BF02084572

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