摘要
用微温传感器测量了发电厂烟道内的温度起伏频谱,得到烟道内折射率结构常数Cn2的分布及外尺度。结果表明:烟道内的温度谱可用von Karman谱表示,外尺度基本不随离烟道壁的距离变化,Cn2强度随离烟道壁的距离增加而增加。在处理平均风速值时,要考虑结构常数分布对加权函数的影响。由Cn2计算出的光闪烁强度远小于实测的光闪烁强度,因此,光束通过烟道气流的闪烁主要原因不是来自温度起伏。
The spectrum of temperature fluctuations was measured by micro-temperature detector in duct. The distribution of Cn^2 and outer scale was obtained in duct. The results of measurement show that some temperature spectra accord with von Karman＇s law in duct. The distribution of Cn^2 are given in duct. In the end, outer scale has little variety in duct. Therefore, managing the average of the wind speed, we must have taken into account the effect on the path weighting function by the distribution of Cn^2. Scintillation coming from refractive index fluctuations is more less than the measurement of scintillation in fact. Temperature fluctuations are not main source in scintillation in duct.
出处
《量子电子学报》
CAS
CSCD
北大核心
2006年第5期741-745,共5页
Chinese Journal of Quantum Electronics
关键词
大气光学
烟道
温度起伏谱
闪烁
atmospheric optics
duct
spectrum of temperature fluctuation
scintillation
