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High resolution observation by means of tomographic adaptive optics

通过断层扫描自适应光学器件进行高分辨率观察

基本信息

批准号：
04405008
负责人：
IYE Masanori
金额：
$ 13.44万
依托单位：
National Astronomical Observatory
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

Researches carried out in this project were to establish the adaptive optics systems of practical use in order to improve the spatial resolution of large telescopes.(1) The wavefront tilt correcting system, the so-called image stabilizer, optimized for the Coude infrared spectrograph of Okayama 188cm telescope was assembled and calibrated for actual usage. In order to enhance the efficieny of this system, an adptive control system of the servo loop was designed, tested, and implemented.(2) A joint experiment with the CFHT group to evaluate the internal dome seeing at the existing telescope enclosure is outlined and a special original instrument, named a dome-seeing monitor, was fabricated and calibrated.(3) A deformable mirror, 50mm in diameter, 0.5mm in thickness, mounted on 37 piezo actuators was fabricated and calibrated.(4) A new type parallel-read CCD with skipper architecture to reduce the read noise and ensure fast frame rate was designed and manufactured in collaboration with the JPL.An electronic system to evaluate the performance of this system is under construction.(5) Control algorithm to calculate the drive signal from wavefront error was etablished.(6) Simulation of curvature sensing to evaluate the vertical structure of the turbulent atmosphere was made.(7) Practical problems of evaluating the 3D structure of turbulent air using tomographic methods were assecced and possible ways to solve these difficulties were studied.These achievements are in line with the original research goals of the present project and opened a practical way to establish an adaptive optives system useful for astronomy.

该项目开展的研究是建立实用的自适应光学系统，以提高大型望远镜的空间分辨率。(1)为冈山188厘米望远镜的Coude红外光谱仪优化设计了波前倾斜校正系统，即稳像器，并进行了实际使用的装配和标定。为了提高系统的效率，设计了伺服回路的自适应控制系统，并进行了试验和实现。(2)与CFHT组的联合实验，以评估在现有的望远镜外壳的内部圆顶看到概述和一个特殊的原始仪器，命名为圆顶看到监视器，制造和校准。(3)制作了一个直径50mm、厚度0.5mm、安装在37个压电驱动器上的变形镜，并进行了标定。(4)与JPL合作设计并制造了一种新型的具有skipper结构的并行读取CCD，以降低读取噪声并确保快速的帧速率，并正在构建一个电子系统来评估该系统的性能。(5)建立了由波前误差计算驱动信号的控制算法。(6)对曲率敏感技术用于湍流大气垂直结构的测量进行了模拟。(7)本文分析了用层析成像方法评价湍流空气三维结构的实际问题，探讨了解决这些问题的可能途径，这些成果符合本课题的研究目标，为建立天文学上的自适应光学系统开辟了一条可行的途径。