尾流气泡群后向散射光多普勒移谱特性研究

Study on characteristic for doppler shift spectrum of backward flow bubble group backward scattered light

船舶在航行过程中会因为螺旋桨的作用产生大量的气泡,本文利用差动技术研究了尾流气泡群后向散射光多普勒移谱特性,在研究过程中首先阐述了差动多普勒探测原理,然后根据蒙特卡罗模型对整个频移进行无偏估计。最后进行了气泡数密度、气泡速度对后向散射光信号的多普勒频移影响的仿真实验,实验结果表明,二者与多普勒谱频移成正比。

In the course of sailing,a large number of bubbles are produced by the action of propellers.In this paper,the Doppler shift spectra of wake bubbles were studied by differential technique.In the course of the study,the differential Doppler detection principle was first described.Then,the unbiased estimation of the whole frequency shift was carried out according to the Monte Carlo model.Finally,the simulation experiments of the influence of bubble number density and bubble velocity on the Doppler shift of the backscattered light signal were carried out.The experimental results showed that the two factors were proportional to the frequency shift of Doppler spectra.