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。
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.
关键词
星像抖动
时域频谱
大气湍流
stellar image motion,temporal-frequency spectrum,atmospheric turbulence
