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Infrared detector Dewars - Increased LN2 hold time and vacuum jacket life spansIR detector Dewars commonly suffer from shorter than desired LN2 hold times and insulation jacket vacuum corruption over relatively short time periods. In an attempt to solve this problem for a 9144 detector Dewar, small 1 liter/s appendage ion pumps were selected for continuous pumping of the vacuum jackets. This procedure extended LN2 hold times from 20 to 60 h and virtually eliminated vacuum jacket corruption. Thus the detector systems are usable continuously over periods of 6 months or more.
Document ID
19760043735
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jennings, D. E.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Boyd, W. J.
(Du Pont de Nemours Pioneering Research Laboratory Wilmington, Del., United States)
Blass, W. E.
(Tennessee, University Knoxville, Tenn., United States)
Date Acquired
August 8, 2013
Publication Date
April 1, 1976
Publication Information
Publication: Applied Optics
Volume: 15
Subject Category
Engineering (General)
Accession Number
76A26701
Funding Number(s)
CONTRACT_GRANT: NGL-43-001-006
Distribution Limits
Public
Copyright
Other

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