New far infrared and millimetric telescopes for differential measurements with a large chopping angle in the sky

Details New far infrared and millimetric telescopes for differential measurements with a large chopping angle in the sky New far infrared and millimetric telescopes for differential measurements with a large chopping angle in the sky

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apopt..28.1785d&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 28, May 15, 1989, p. 1785-1792. Research supported by CNR.

Physics

Optics

13

Far Infrared Radiation, Infrared Telescopes, Millimeter Waves, Radio Telescopes, Balloon-Borne Instruments, Cassegrain Optics, Relic Radiation, Temperature Distribution

Scientific paper

The optical design of two Cassegrain-type telescopes of 1200- and 2500-mm primary mirrors has been studied by wobbling subreflectors to obtain differential measurements in wavelengths ranging from 300 microns to 2 mm of the spectrum. Wide chopping angles in the sky have been reached in spite of the large apertures and high secondary magnifications. Diffraction-limited performances are maintained by tilting the secondary mirror around the primary focus.

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