Measurement error analysis of the velocity of sound in atmosphere based on Brillouin iidar
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摘要: 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。Abstract: In order to analyze the error of the velocity of sound in atmosphere, based on Brillouin lidar, the measuring method of sound velocity in atmosphere was put forward for its high precision, high speed and real time. The concrete relation between the velocity of sound and other atmosphere parameters was analyzed. Then, the measurement error of the velocity of sound was calculated and the numerical analysis was fulfilled. The results show that, in the condition of standard atmosphere, the precision of the velocity of sound is less than 0.269m/s in the height of 0km～86km. The Brillouin frequency shift has a greater influence on the error of the velocity of sound than the refractive index and the laser wavelength in the atmosphere. This analysis is a significant guide for the lidar design.
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Keywords:
- atmospheric and ocean optics /
- lidar /
- Brillouin scattering /
- velocity of sound /
- error analysis
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