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Küveler G. Wiehr E. Thomas D. Harzer M. Bianda M. Epple A. Sütterlin P. Weisshaar E. 《Solar physics》1998,182(1):247-255
The primary image reflected from the field stop of solar Gregory telescopes is used for automatic guiding. This new system
avoids temporal varying influences from the bending of the telescope tube by the main mirror's gravity and from offsets between
the telescope and a separate guiding refractor. The required stiffness of the guider mechanics and the small areas of the
sensors demand small f numbers for the guider optics, which cause problems with the image quality and with heat. Problems
also arise from the pinhole in the telescope's field stop which is imaged as a dark dot on the sensor. Pointing errors introduced
by the telescope affect shifts of the solar image on the sensor. These are numerically determined by Fourier methods which
are found to be less sensitive to noise than profile centering methods. Several types of guiders are tested, the final equipment,
now installed at the Gregory telescopes at Tenerife and at Locarno, is described. 相似文献
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