Infrared detector Dewars - Increased LN2 hold time and vacuum jacket life spans

Details Infrared detector Dewars - Increased LN2 hold time and vacuum jacket life spans Infrared detector Dewars - Increased LN2 hold time and vacuum jacket life spans

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apopt..15..836j&link_type=abstract

Applied Optics, vol. 15, Apr. 1976, p. 836, 837.

Physics

Optics

Cryogenic Equipment, Infrared Detectors, Ion Pumps, Liquid Nitrogen, Design Analysis, Evacuating (Vacuum), Service Life, Thermal Insulation, Vacuum Systems

Scientific paper

IR 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.

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