Chopping secondary mirror for a cooled infrared telescope

Details Chopping secondary mirror for a cooled infrared telescope Chopping secondary mirror for a cooled infrared telescope

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apopt..25..523k&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 25, Feb. 15, 1986, p. 523-527.

Physics

Optics

4

Cryogenic Cooling, Infrared Telescopes, Mirrors, Cooling Systems

Scientific paper

A 10-cm chopping secondary for operation in the cryovacuum has been
developed. It is momentum compensated and allows square wave modulation
of up to 20 Hz and a beam separation of up to several minutes of arc in
the sky. The low heat dissipation of 5 mW at a temperature of 4.2 K
makes the chopper suitable for a liquid helium-cooled space telescope.

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