AI 中文总结
研究SOAR望远镜的振动，发现50Hz震颤经快速倾斜镜伺服放大、风激发65Hz主镜支撑共振等，其振动表征为其他望远镜研究提供参考。
AI 中文摘要
位于智利的4.1米南方天体物理研究（SOAR）望远镜，与更大的光学望远镜类似，拥有薄型主动控制主镜、内置倾斜校正、轻量化结构以及自适应光学（AO）湍流校正系统。AO系统已检测到SOAR光轴存在非平稳振动，其频率为50Hz，振幅达20-30毫角秒（mas），这一振动会降低光学散斑干涉测量数据的质量。加速度计显示，该50Hz震颤由外部源驱动，在望远镜结构内传播，并被快速倾斜镜伺服系统的响应大幅放大，形成特征性椭圆光束路径。AO系统还在离焦中检测到47Hz的周期性分量（与电子机架及计算机风扇的频率匹配），像散中存在约65Hz的周期性分量，后者与SOAR主镜支撑结构的共振相关，显然由风激发。典型频率为0.5-2.5Hz的周期性跟踪误差主要由编码器的周期性误差导致，具体取决于编码器的对准情况，且在快速跟踪速率下会被 mount（机架）伺服系统放大。对SOAR的振动表征研究可为其他望远镜的类似研究提供参考。
英文摘要
The 4.1-m Southern Astrophysics Research (SOAR) telescope in Chile resembles larger optical telescopes by its thin actively controlled primary mirror, built-in tip-tilt correction, lightweight structure, and adaptive optics (AO) turbulence correction. The non-stationary vibration of the SOAR optical axis with a frequency of 50 Hz and an amplitude reaching 20-30 mas has been detected by the AO system, degrading the quality of optical speckle interferometric data. Accelerometers revealed that the 50 Hz tremor, driven by an external source, propagates within telescope structure and is strongly amplified by the response of the fast tip-tilt mirror servo system, producing characteristic elliptical beam path. The AO system also evidenced periodic components at 47 Hz in the defocus (matching the frequency of fans in electronic racks and computers) and at ~65 Hz in the astigmatism. The latter is associated with structural resonances of the SOAR primary mirror support, apparently excited by the wind. Periodic tracking errors with typical frequencies of 0.5-2.5 Hz are mostly caused by periodic errors of the encoders, depending on their alignment, and can be amplified by the mount servo at fast tracking rates. Vibration characterization at SOAR informs similar studies at other telescopes.
Comments17 pages, 14 figures
