Cooled baffle system for spaceborne infrared telescopes

Details Cooled baffle system for spaceborne infrared telescopes Cooled baffle system for spaceborne infrared telescopes

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apopt..34.2268b&link_type=abstract

Applied Optics, Volume 34, Issue 13, May 1, 1995, pp.2268-2277

Physics

Optics

4

Space Optics, Infrared, Telescopes

Scientific paper

We report the design and testing of a compact system of baffles for cooled infrared telescopes. The baffle system consists of a reflecting forebaffle and a black aftbaffle and provides a high level of rejection of emission from off-axis sources. The forebaffle reflects radiation incident at angles greater than 40 deg off axis out of the telescope, thereby reducing the aperture heat load. The black aftbaffle absorbs radiation scattered or diffracted by the forebaffle, as well as radiation from sources within 40 deg off axis. We describe ground-based measurements at lambda = 0.9 mu m of the baffle system at ambient temperature and rocketborne measurements at far-infrared wavelengths of the baffle system at approximately 3 K. The effective emissivity of the cooled forebaffle was measured to be 7 \times 10-3. The system has been successfully used in rocketborne measurements of the diffuse infrared background and will be used in the Infrared Telescope in Space.

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