提出了一种基于气泡群后向散射光多普勒频移谱特性的舰船尾流检测方法。利用蒙特卡罗(Monte Carlo)方法对尾流区运动气泡群后向散射激光多普勒频移谱进行了理论模拟,分析了气泡数密度和速率分布对后向散射光信号多普勒频移谱特性的影响。在此基础上,利用差动型激光多普勒探测方法,实验研究了模拟尾流气泡群后向散射光多普勒频移谱特性,实验结果与理论模拟基本符合。研究表明,随着尾流中气泡数密度和速率分布范围的增大,后向散射光信号的多普勒频移谱的幅度、截止频移也随之增大。这证明了激光后向散射多普勒频移谱特性分析法可作为一种有效的尾流检测方法。 A wake wake detection method based on Doppler shift spectrum of backscattered bubbles was proposed. The Monte Carlo method was used to simulate the laser Doppler shift spectrum of backscattering bubbles in the wakes. The effects of bubble density and velocity distribution on the Doppler shift of backscattered optical signals Effect of spectral characteristics. On the basis of this, the Doppler spectral characteristics of backscattering light of simulated wake fluid bubbles are experimentally studied by the differential laser Doppler detection method. The experimental results are in good agreement with the theoretical ones. The results show that with the increase of bubble density and velocity distribution in the wake, the amplitude and the cut-off frequency of the Doppler shift spectrum of the backscattered optical signal also increase. This proves that the laser backscatter Doppler shift spectrum analysis can be used as an effective wake detection method.