| 摘要 |
PURPOSE:To extremely rapidly attenuate the extremely little oscillations of a mirror and to prevent the deterioration in the performance of a telescope by providing a magnetic fluid damper as an attenuating material between a mirror cell and a 2nd sliding mechanism. CONSTITUTION:The magnetic fluid damper 13 is which attenuates the oscillations of the mirror 1 of the telescope is provided between the mirror cell 2 and the 2nd sliding mechanism 8. The mirror 1 is slightly oscillated at about 20Hz natural oscillation in the axial direction of the mirror by wind, etc., and a part of the oscillations are transmitted via a load cell 3, the 1st sliding mechanism 4, a 1st universal joint 5, a support rod 7, a 2nd universal joint 6, the 2nd sliding mechanism 8, a spring 9 and a feed mechanism 10 to the mirror cell 2. Since the oscillations are sufficiently rapidly attenuated by the magnetic fluid damper 13, even the very slight oscillations of <=1mum are eliminated and the deterioration in the performance is prevented. |
