TMT tertiary mirror jitter measurement with acceleration signal
-
摘要: 为了更好地对于TMT三镜镜面jitter进行评价,基于镜面方向的加速度信号,通过传递函数以及功率谱的方法,获得了镜面jitter的频域分布与数值特征。首先,对于梯形积分、辛普森积分以及3/8辛普森积分的基本性质进行推导,之后基于功率谱的思想,提出利用白噪声填满数据全部频域以及结合数值方法得到传递函数;最后对于实际测量得到的加速度信号,得到了米级口径望远镜镜面jitter的数值以及频域分布,同时证明了利用文中方法对TMT三镜镜面jitter进行评价的可行性。文中的方法对于同类的大口径望远镜的jitter测量也有一定的借鉴意义。Abstract: To evaluate the jitter of the Thirty Meter Telescope tertiary mirror, the acceleration signal collected from the tertiary mirror should be integrated into displacement signal and to be analyzed. The first and foremost, the acceleration of the mirror along the normal line was achieved. Then, the trapezoidal, Simpson, 3/8 Simpson numerical integration method were analyzed to show the basic property of the integration method; after that, using the transfer function and spectrum method, the jitter property of a large telescope at one meter scale was analyzed in both value and frequency domain and the jitter after adaptive optical adjustment was 6 m RMS. At the same time, this verifies the testing process plan for the jitter of the TMT M3. In this paper, the basic procedure for mirror jitter analysis was presented, and the conclusion can be draw that the method is adequate to fit the requirement proposed by TMT project. This work will give guidance to the jitter testing in the similar large aperture system.
-
Key words:
- TMT M3 /
- numerical integration /
- jitter /
- transfer function /
- power spectral density
-
[1] [2] Ford V, Carter C, Delrez C, et al. Jitter studies for the secondary and tertiary mirror systems on the thirty meter telescope[C]//SPIE Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 2014, 9151:1-15. [3] Sheehan M, Carter C. A high speed data acquisition system to measure telescope response to earthquake induced ground motion[C]//SPIE Modeling System Engineering and Project Management for Astronomy IV, 2010, 7738:77381P-10. [4] [5] Zhu Shuo, Zhang Xiaohui. Application of error detaching to Ritchey-Common test for flat mirrors[J]. Optics and Precision Engineering, 2014, 22(1):7-12.(in Chinese) 朱硕,张晓辉.误差分离技术在平面镜瑞奇-康芒法检测中的应用[J]. 光学精密工程, 2014, 22(1):7-12. [6] [7] [8] Ross Zhelem. Specification of optical surface accuracy using the structure function[C]//SPIE, 2011, 8083:808310-1~808310-10. [9] [10] Zhou Chao, Yang Hongbo, Wu Xiaoxia, et al. Influence of the wind loading on 1.2 m telescope[J]. Infrared and Laser Engineer, 2011, 40(5):889-893.(in Chinese) 周超,杨洪波,吴晓霞,等. 1.2望远镜风载作用分析[J]. 红外与激光工程, 2011, 40(5):889-893. [11] [12] Shi Tu, Yang Yongying, Zhang Lei, et al. Surface testing methods of aspheric optical elements[J]. Chinese Optics, 2014, 7(1):26-46.(in Chinese) 师途,杨甬英,张磊,等.非球面光学元件的面形检测技术[J]. 中国光学, 2014, 7(1):26-46. [13] Su Yanqin, Zhang Jingxu, Wang Fuguo, et al. Seismic analysis of TMT M3 cell assembly based on spectral response[J]. Optics and Precision Engineering, 2014, 22(4):996-1003.(in Chinese) 苏燕芹,张景旭,王富国,等.基于谱分析的30 m望远镜三镜支撑结构地震分析[J]. 光学精密工程, 2014, 22(4):996-1003. [14] [15] Wang Fuguo, Yang Hongbo, Yang Fei, et al. Optimization and analysis for the axis support points position of the large aperture mirrors[J]. Infrared and Laser Engineering, 2007, 36(6):877-880.(in Chinese) 王富国,杨洪波,杨飞,等.大口径主镜轴向支撑点位置优化分析[J]. 红外与激光工程, 2007, 36(6):877-880. [16] [17] Wang Fuguo. Yang Fei. Zhao Hongchao. et al. Progress in TMT M3 System[J]. Chinese Optics, 2013, 10(6):643-651.(in Chinese) 王富国,杨飞,赵宏超,等. TMT望远镜三镜系统的研究进展[J]. 中国光学, 2013, 10(6):643-651. [18] [19] Jonathan R White, Douglas E Adams, Mark A Rumsey. Theoretical analysis of acceleration measurements in a model of an operating wind turbine[C]//Proc SPIE, Active and Passive Smart Structures and Integrated Systems, 2010, 7643:76431F. -
点击查看大图
计量
- 文章访问数: 317
- HTML全文浏览量: 64
- PDF下载量: 201
- 被引次数: 0
下载:
