Chopping secondary mirror for a cooled infrared telescope
Abstract
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.
- Publication:
-
Applied Optics
- Pub Date:
- February 1986
- DOI:
- Bibcode:
- 1986ApOpt..25..523K
- Keywords:
-
- Cryogenic Cooling;
- Infrared Telescopes;
- Mirrors;
- Cooling Systems;
- Spacecraft Instrumentation;
- INFRARED;
- TELESCOPES