| 星像抖动的时域频谱 |
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| 引用本文： | 宋正方. 星像抖动的时域频谱[J]. 中国天文和天体物理学报, 1995, 0(3) |
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| 作者姓名： | 宋正方 |
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| 作者单位： | 中国科学院安徽光机所 |
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| 摘 要： | 本文顾及湍流外尺度的影响导出了星像抖动频谱的普遍表达式，在均匀光路的情况下得到了分析表达式。理论结果与实验数据相当一致。同时讨论了测量星像抖动所需要的频带宽度以及有限带宽所产生的测量误差。
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| 关 键 词： | 星像抖动，时域频谱，大气湍流 |
The Temporal-Frequency Spectrum of Stellar Image Motion |
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| SONG Zheng-fang. The Temporal-Frequency Spectrum of Stellar Image Motion[J]. Chinese Journal of Astronomy and Astrophysics, 1995, 0(3) |
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| Authors: | SONG Zheng-fang |
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| Abstract: | A universal expression of stellar-image motion spectrum for the collimated wave propagating through atmospheric turbulence is developed in which the effect of turbulent outer-scale is taken into account. The analytical formula for a homogeneous path is given. Calculation shows that the theoretical results agree well with the experiments. The bandwidth required for a measurement system of stellar-image motion and the measurement error resulting in a limited bandwidth are discussed.It is concluded that for angle-of-arrival seeing measurements, standard video frame rates are acceptable provided the sampling period is 10 seconds or more in homogeneous path. But a wider frequency response is indispensable in stellar seeing monitors. |
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| Keywords: | stellar image motion temporal-frequency spectrum atmospheric turbulence |
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