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首页> 外文会议>Conference on Optics in Atmospheric Propagation and Adaptive Systems Ⅳ Sep 18-20, 2001, Toulouse, France >Statistical analysis of measurements of atmospheric turbulence in different climates
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Statistical analysis of measurements of atmospheric turbulence in different climates

机译：不同气候下大气湍流测量的统计分析

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Atmospheric turbulence may have a strong impact on the imaging quality of long range warning sensors and other electro-optical systems. Major effects are beam broadening, intensity fluctuations (or scintillation) and angle-of-arrival fluctuations. The structure constant of refractive index fluctuations, C_n~2, is the parameter most commonly used to describe the strength of atmospheric turbulence. FGAN-FOM measured C_n~2 values in two different climates, moderate climate in mid-Europe, Germany and arid climate in Israel. The measurements in arid climate were carried out in co-operation with the EORD (Electro-Optics Research & Development Foundation Ltd.), TECHNION, Haifa, Israel. The measurements were performed with identical laser scintillometers along a horizontal optical path of about 100 m, above grassland in mid-Europe, and above stony ground without vegetation in Israel. The data were collected continuously for a time period of at least one year at a time resolution of 5 minutes. For both climates examples of the diurnal cycle of C_n~2 are given. Since C_n~2 usually changes as a function of time-of-day and of season its influence on electro-optical systems can only be expressed in a statistical way. Therefore the cumulative frequencies of occurrence of C_n~2 were calculated for a time period of one month for both climates. These results were used to calculate the corresponding turbulence modulation transfer function (MTF) and point spread function (PSF) for a typical IR sensor with a Cadmium Mercury Telluride detector (CMT) and a UV sensor.
机译：大气湍流可能会对远程警告传感器和其他光电系统的成像质量产生重大影响。主要影响是光束展宽，强度波动（或闪烁）和到达角波动。折射率波动的结构常数C_n〜2是最常用于描述大气湍流强度的参数。 FGAN-FOM在两种不同的气候下测量了C_n〜2值：欧洲中部德国的中等气候和以色列的干旱气候。干旱气候下的测量是与以色列海法TECHNION的EORD（电光研究与发展基金会有限公司）合作进行的。测量是使用相同的激光闪烁仪沿大约100 m的水平光路进行的，在欧洲中部的草地上方，在以色列没有植被的石质地面上方。在至少一年的时间内，以5分钟的时间分辨率连续收集数据。对于这两种气候，都给出了C_n〜2日周期的例子。由于C_n〜2通常根据一天中的时间和季节而变化，因此它对光电系统的影响只能以统计方式表示。因此，计算了两种气候在一个月的时间内C_n〜2的累积发生频率。这些结果用于计算具有碲化镉汞检测器（CMT）和紫外线传感器的典型IR传感器的相应湍流调制传递函数（MTF）和点扩展函数（PSF）。

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