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Proceedings Paper

Precision calibration of balloonborne solar telescope
Author(s): Haiying Zhang; Houkun Ni
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Paper Abstract

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.

Paper Details

Date Published: 6 October 2000
PDF: 7 pages
Proc. SPIE 4231, Advanced Optical Manufacturing and Testing Technology 2000, (6 October 2000); doi: 10.1117/12.402760
Show Author Affiliations
Haiying Zhang, Nanjing Astronomical Instruments Research Ctr. (China)
Houkun Ni, Nanjing Astronomical Instruments Research Ctr. (China)

Published in SPIE Proceedings Vol. 4231:
Advanced Optical Manufacturing and Testing Technology 2000
Li Yang; Harvey M. Pollicove; Qiming Xin; James C. Wyant, Editor(s)

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