本文關(guān)鍵詞：擺鏡在NVST圖像穩(wěn)定控制系統(tǒng)中的應(yīng)用研究　出處：《中國科學(xué)院研究生院(云南天文臺(tái))》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： NVST 隨機(jī)風(fēng)載 二維擺鏡 圖像穩(wěn)定控制系統(tǒng) 數(shù)值模擬 實(shí)驗(yàn)分析

【摘要】：一米紅外太陽望遠(yuǎn)鏡(New Vacuum Solar Telescope,簡稱NVST)安放在云南澄江撫仙湖東北岸,主要是對(duì)太陽進(jìn)行高分辨率的成像和光譜觀測(cè)。為了保證觀測(cè)時(shí)良好的圓頂視寧度,采用了圓頂移開并遠(yuǎn)離望遠(yuǎn)鏡的敞開式觀測(cè)模式,加上望遠(yuǎn)鏡本身的結(jié)構(gòu)特點(diǎn)以及該臺(tái)址常年平均風(fēng)速較大,使得該望遠(yuǎn)鏡跟蹤系統(tǒng)受隨機(jī)風(fēng)載的干擾較大。表現(xiàn)為NVST在觀測(cè)的過程中,太陽像會(huì)隨風(fēng)出現(xiàn)較大幅度的低頻抖動(dòng),嚴(yán)重影響終端光譜儀等系統(tǒng)的觀測(cè)。為了解決這一問題,本論文開展了基于二維擺鏡的圖像穩(wěn)定控制系統(tǒng)的相關(guān)研究工作。論文首先在第二章分析了在隨機(jī)風(fēng)載影響下光電導(dǎo)行系統(tǒng)和TiO高分辨率成像系統(tǒng)圖像在隨機(jī)風(fēng)載下圖像抖動(dòng)的特點(diǎn),并提出了兩種穩(wěn)定隨機(jī)風(fēng)載引起圖像抖動(dòng)的方案。第三章介紹了控制系統(tǒng)的主要硬件參數(shù),并對(duì)擺鏡及其驅(qū)動(dòng)控制器的核心器件進(jìn)行了性能測(cè)試分析。然后根據(jù)擺鏡的性能測(cè)試結(jié)果,在第四章中對(duì)擺鏡圖像穩(wěn)定控制系統(tǒng)建立了傳遞函數(shù)模型,并對(duì)提出的兩種控制方案分別進(jìn)行了數(shù)值模擬分析。對(duì)比分析了兩種方案下的數(shù)值模擬的結(jié)果,并在論文的第五章重點(diǎn)實(shí)驗(yàn)分析了擺鏡圖像穩(wěn)定閉環(huán)控制系統(tǒng)穩(wěn)定隨機(jī)風(fēng)載引起的圖像抖動(dòng)性能。論文以深入的數(shù)值模擬分析和部分實(shí)驗(yàn)分析表明,在5到6級(jí)風(fēng)作用的情況下,擺鏡圖像穩(wěn)定閉環(huán)控制系統(tǒng)工作在25Hz就能將一米紅外太陽望遠(yuǎn)鏡焦面圖像抖動(dòng)的RMS值控制在0.5角秒以內(nèi),從而表明二維擺鏡的圖像穩(wěn)定閉環(huán)控制系統(tǒng)是可以穩(wěn)定該望遠(yuǎn)鏡由隨機(jī)風(fēng)載引起的圖像抖動(dòng)的。
[Abstract]:The 1-meter infrared solar telescope, New Vacuum Solar Telescope, is located on the northeast shore of Fuxian Lake, Chengjiang, Yunnan Province. High resolution imaging and spectral observation of the sun are mainly carried out. In order to ensure a good dome apparent degree, the open observation mode of the dome moving away and away from the telescope is adopted. Combined with the structural characteristics of the telescope itself and the large annual average wind speed at the site, the tracking system of the telescope is greatly disturbed by random wind load, which is manifested in the observation process of NVST. In order to solve this problem, the solar image will appear a large amplitude of low-frequency jitter with the wind, which seriously affects the observation of the terminal spectrometer and other systems. In the second chapter, the photoconductive system and TiO high resolution imaging system under random wind load are analyzed. The characteristics of image jitter under wind-load. Two schemes of image jitter caused by steady random wind load are proposed. In chapter 3, the main hardware parameters of the control system are introduced. The core components of the pendulum mirror and its driving controller are tested and analyzed. Then, according to the performance test results of the pendulum mirror, the transfer function model of the image stability control system of the pendulum mirror is established in Chapter 4th. The numerical simulation results of the two control schemes are compared and analyzed. In the 5th chapter of the thesis, the image jitter performance caused by stable random wind load of the closed loop control system of pendulum image stabilization is analyzed. In the case of 5 to 6 grades of wind, the RMS value of focal plane image jitter of 1 meter infrared solar telescope can be controlled within 0. 5 angle seconds when the closed loop control system of pendulum image stability works at 25 Hz. It is shown that the image stability closed-loop control system of two-dimensional pendulum mirror can stabilize the image jitter caused by random wind load of the telescope.
【學(xué)位授予單位】：中國科學(xué)院研究生院(云南天文臺(tái))
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P111.41

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本文編號(hào)：1431194