TMT Tertiary Mirror Optical Jitter Model Metrology
TMT Tertiary Mirror Optical Jitter Model Metrology
复制标题
TMT 三镜光学抖动模型计量
DOI：
10.11916/j.issn.1005-9113.2016.06.010
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发表时间：
2016-12
期刊：
影响因子：
--
通讯作者：
赵宏超
中科院分区：
文献类型：
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作者：
安其昌;张景旭;杨飞;赵宏超
为了测量色度计望远镜三面镜(TMT M3)的抖动性能，建立了基于加速信号的抖动模型。首先，介绍了处理抖动数据所需的TMT过程。然后，将系统的抖动分为有源抖动和非有源抖动两部分。抖动的度量要求是位移或角度的形式。因此，在时域积分中引入频率积分来减小趋势项引入的误差源。在功率抖动的评估中，使用加速度计来获得三次镜的刚体运动。应用随机递减技术和主模理论建立了无功抖动模型。经典望远镜的抖动度量为1.6“rms；对于4米尺度的系统，共振频率约为107赫兹，功率为0.14%，阻尼值为0.14%。因此，同时测量了尖端(183赫兹，0.6%)和倾斜度(193赫兹，0.19%)。利用该模型，系统工程师可以估计出系统在失真状态下的无电源抖动。
To measure the jitter performance of the Tirthy Meter Telescope tertary mirror(TMT M3), the model of jitter based on the accerleration signal is established. First and foremost, the procedure TMT required to processs the jitter data is presented. Then, the jitter of the system is divided into two parts: powered jitter and unpowered jitter. The metric of the jitter is required to be in the form of displacement or angle. So the frequency integration is involved to minify the error source introduced by the tending iterm in the time domain integration. In the evaluation of the power jitter, the accelerometers are used to obtain the rigid body motion of the tertiary mirror. The random decrement technique and dominated mode theory are applied to obtain the model of unpowered jitter. A classical telescope performances a 1.6” RMS jitter metric; for a four meter scale system, the resonance frequency is around 107 Hz, powering, with 0.14% damping. Consequently, the tip (183 Hz, 0.6%) and tilt (193 Hz, 0.19%) are both be measured. Using this model, the system engineers can estimate the unpowered jitter when the system is presented in the distortion.