摘要
为探索舰船尾流后向光学检测方法,研究了尾流气泡对水中激光脉冲后向散射特性的影响。首先基于Fournier Forand体积散射函数,利用蒙特卡罗(Monte-Carlo)方法理论分析了近距离尾流气泡对激光脉冲后向散射特性的影响。然后,采用蓝绿激光脉冲作为光源,实验研究了模拟尾流气泡对激光脉冲后向散射信号的影响。研究表明,尾流气泡的存在会使得激光脉冲后向散射信号前沿位置在时域左移,后沿位置在时域右移,信号时域宽度增加,能量增强,峰值增大且位置在时域左移。最后根据研究结果提出了一种基于激光脉冲后向散射信号特征变化的舰船尾流气泡后向检测方法。
In order to search a backward optical method for ship wake detection, the influence of wake bubbles on backscattering signal of laser pulse in water is studied. Firstly, based on Fournier Forand volume scattering function, the influence of short-distance bubbles on laser pulsers backscattering signal in water is analyzed. Secondly, using blue-green laser pulse as light source, the influence of imitated bubbles on laser pulse＇s backscattering signal in water is studied experimentally. The results show that, because of wake bubbles, back scattering signal＇s leading edge moves left, and its trailing edge moves right. Moreover, the broadering of its width, enhancement of its energy and the increase of its peakvalue also happen, and its position moves left in time-domain. Finally, according to the result, a backward detection method for ship wake bubbles is presented on the basis of the characteristic＇s variation of laser pulse＇s backscattering signal.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2012年第1期1-5,共5页
Acta Optica Sinica
基金
中国船舶重工集团公司第705研究所基础研究基金资助课题
