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 Am 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. This work is included in the TIR (Telescopio InfraRosso) project.
De Petris, M., Gervasi, M., Liberati, F. (1989). New far infrared and millimetric telescopes for differential measurements with a large chopping angle in the sky. APPLIED OPTICS, 28(10), 1785-1792 [10.1364/AO.28.001785].
New far infrared and millimetric telescopes for differential measurements with a large chopping angle in the sky
GERVASI, MASSIMO;
1989
Abstract
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 Am 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. This work is included in the TIR (Telescopio InfraRosso) project.
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