Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4231..416z&link_type=abstract
Proc. SPIE Vol. 4231, p. 416-422, Advanced Optical Manufacturing and Testing Technology 2000, Li Yang; Harvey M. Pollicove; Qimi
Astronomy and Astrophysics
Astronomy
Scientific paper
Balloon-borne Solar Telescope is an optical telescope with effective aperture of 80 cm. To reduce polarization effect to measuring of solar magnetic field, the optical system is specially designed and the collimating lens is special and difficult to calibrate. To reduce the gross weight of telescope, the primary mirror is lightweight with thickness- to-diameter ratio of 1/10. But the system must reach to its imaging quality of diffraction limit. So some special techniques are introduced to guarantee the optical imaging quality. First, lateral shearing interferometer is used to test every optical component after they are assembled in barrels or cells; then two visible points that can be seen through alignment telescope form the optical axis of every component. After system optical axis is established also by alignment telescope, those optical components can be calibrated precisely on it. Since lacking standard mirror that is the same size as primary mirror, some ground-base trial observations without vacuum tube were taken to test the imaging quality. According to astronomer's conclusion, the system can get high resolution solar image when in operation.
Ni Houkun
Zhang Haiying
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