不同地区大气光学湍流内外尺度测量
Measurement of inner and outer scale of atmospheric optical turbulence in different areas
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摘要: 用光学湍流参数自动测量系统对内陆地区和沿海地区光学湍流内外尺度进行了大量的实验观测。分析了湍流尺度的日变化规律，给出了其频数分布。结果表明：两地内尺度的均值为十几mm，外尺度的均值约为2 m；内陆地区内尺度日变化趋势较为复杂，而外尺度的日变化趋势与湍流强度十分相似；沿海地区内外尺度与湍流强度均无明显关系。大气湍流尺度的大小和分布状态是随时间和空间变化的，因此，在估算实际大气湍流对光学系统的影响时，需要实测湍流尺度以便得到准确的结果。Abstract: Two automatic data-collecting systems were set up respectively in inland and along the coast for measuring the atmospheric turbulence. By long-time observation a great amount of data were obtained. The daily variations and probability of the inner and outer scale of turbulence were analyzed. The mean values of the turbulence inner scale are all more than 10 mm and those of outer-scale are about 2 m in inland and along the coast. The daily variations of the inner scale are complex relatively and those of the outer scale are similar to turbulence intensity in inland. There was no explicit relationship between turbulence scale and turbulence intensity along the coast. The scales and probability distributions of the atmospheric turbulence always vary with the time and space. It is necessary to
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Key words:
- atmospheric optical turbulence /
- temperature fluctuation /
- inner scale /
- outer scale
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