基于布里渊激光雷达测量大气声速误差分析

为了对大气声速误差进行分析,利用布里渊散射信号激光雷达对大气声速进行了测量,分析了大气声速与大气布里渊频移、大气折射率和入射激光波长的具体关系,利用该方法测量了大气声速的精度,并进行了数值分析。结果表明,在标准大气条件下,0km～86km海拔高度范围内大气声速测量的不确定度小于0.269m/s。该误差的分析对激光雷达的设计具有参考价值。

Study on the measurement method for the velocity of sound in atmosphere based on Brillouin lidar

A method of measuring the velocity of sound in atmosphere with lidar detecting Brillouin scatter signal is proposed. The theories formula of Brillouin frequency shift in atmosphere is analyzed, and then the measuring model of velocity of sound in atmosphere is deduced, of which variables are Brillouin frequency shift in atmosphere, refractive index of atmosphere and wavelength of incident light. A design project of lidar system in the practical measure is also involved. Basing on it, precision of measuring the velocity of sound with this method is analyzed in detail, and the simulations are made. The result show that, in the condition of standard atmosphere, the precision is less than 0.269m/s in the height of 0 to 86km. Comparing with other direct methods, this has some advantages, high precision, high speed and so on, and also has important significant for atmosphere environment detecting.