测量大气折射率结构常数的大口径激光闪烁仪  

Large Aperture Laser Scintillometer for Measuring the Refractive Index Structure Constant of Atmospheric Turbulence

作　　者：马晓珊[1] 朱文越[1] 饶瑞中[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所大气光学研究室,安徽合肥230031

出　　处：《中国激光》2008年第6期898-902,共5页Chinese Journal of Lasers

基　　金：国防预研基金(51403040605zk0901)资助项目

摘　　要：基于光闪烁的孔径平均效应,研制了测量大气折射率结构常数的大口径激光闪烁仪(LALS)。该仪器在一定程度上实现了闪烁饱和现象的抑制。仪器采用对称式结构布局,同时采用调制解调方法提高信噪比,并以嵌入式控制单元完成对数据的采集、处理、显示和存储。与传统仪器设备的测量结果相比,在1000m的水平传输路径上两者的线性拟合系数为1.01,相关系数为0.92;进一步分析表明,大气湍流内尺度会对闪烁方差的测量产生影响,从而导致大气折射率结构常数的测量结果略显离散。Based on the aperture averaging effect of the scintillation effect of light propagation, a large aperture laser scintillometer （LALS） for measuring the refractive index structure constant of atmospheric turbulence was developed. This apparatus can restraint the scintillation saturation at certain extent. This scintillometer has symmetrical structure. Meanwhile, signal modulation and demodulation method is used to increase signal-to-noise ratio dramatically and the embedded control unit is introduced to sample, dispose, display and store the data. Compared with the measuring results from traditional measurement device, the slope of linear regressions of the data in 1000 m horizontal propagating path is 1. 01 and the correlation coefficient is 0.92. Further analysis reveals that the inner scale of the atmospheric turbulence which will influence the measurement of the scintillation variance may lead some degree of scattering of the measurement results of the refractive index structure constant.

关 键 词：大气光学 光传播 大口径闪烁仪 孔径平均效应 折射率结构常数 

分 类 号：P427.1[天文地球—大气科学及气象学]